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Click here or scroll down to respond to this candidateCandidate's Name
Cave Creek, AZ Street Address
Phone: PHONE NUMBER AVAILABLEE-mail: EMAIL AVAILABLEAn accomplished Software Engineer with extensive experience in design and development of software applications and systems.SKILL HISTORYProgramming Languages and WebC#.NET, VB.NET, C++, C, SQL, Java, Perl, Assembly, Python, JavaScript, Node.js, JSON, HTML, CSS, HTTP, REST, ASP.NET, VBScript, XML, Internet Information Services (IIS), CloudOperating SystemsWindows, Windows Server, UNIX, HPUX, pSOS, VxWorks, LinuxDatabaseTransact SQL, Microsoft SQL Server, Informix SQL, dbaccess, Schema, Stored Procedures, Data Access Layer (DAL), Entity Framework, Queries, XMLSchema (XSD)Windows DevelopmentMicrosoft Visual Studio, Microsoft SQL Server Management Studio, Microsoft Team Foundation Server (TFS), .NET Framework, .NET Core, NuGet Packages, NUnit, NLog, Git, GitHub, C#.NET Coding Standards, Docker, ServicesDeployment PipelineConventional, Continuous Integration Continuous Deployment (CICD), Automated Testing, Test Driven Development (TDD), Sonar, Jenkins Pipeline, Jira, Target ProcessProject ManagementAgile, Waterfall, Target Process, JiraProgramming StylesObject Oriented Programming Style (OOPS), ProceduralDesignSystem Design, Software Design, Documents, Diagrams, Flow Charts, Enterprise Architect, UML, Design Patterns, Micro Services, Web APIs, Data Structures, Scalable, SOLIDSoftware Development Life Cycle (SDLC)Requirements, Functional Design, Technical Design, Development, Unit Testing, Configuration, Production Installation, Software MaintenanceApplicationsEnterprise Software, Cloud, Client/Server, Systems Level Programming, GUIs, Real-time, Graphics, Image Processing, Tools, Web, Embedded, Simulation, Drivers, High Frequency Trading (HFT)Transaction Processing / Fintech / Finance / PaymentsISO8583, Visa ISO, Amex ISO, MasterCard ISO, TSYS ISO, TSYS 2nd Gen 1080, 2nd Gen 1081, TSYS 150 File Format, metadata, EMV, Payment Card Industry, PCI ComplianceEncryption / Cryptography / Cyber SecurityHP Atalla Hardware Security Module (HSM), PIN Encryption, Dynamic Key Exchange (DKE), Triple DES, SHA-256, DUKPT, Thales HSM, SSL, Cyber SecurityTestingTest Plans, Unit Testing, Performance Testing, BenchmarksDebuggingTrouble Shooting, Problem Solving, Analytical Skills, Debugging, Inline, Command LineCommunicationsClient Server Networks, TCP/IP, UDP, Socket Programming, LIPC, Distributed, RS-232, RS-485, GPIB, SCRAMNet, ARINC 429Desktop SoftwareWord, Excel, Lotus Notes, Outlook, Skype, Visio, Microsoft Teams, GSuiteCommunication SkillsPowerPoints, Presentations, Lectures, Meetings, Project LeadUNIX ToolsMakefiles, Rogue Wave, Rational ClearCase, Rational Purify, vi, vimSimulation / EmbeddedReal-time, Radar/Flight Simulation, VME, JTAG, Digital Signal Processors (DSP)GraphicsSilicon Graphics Iris (SGI), 3-D Modeling, WindowsAlgorithmsPatented algorithm for analyzing and displaying radar returns, Common Algorithms for high level programmingScientificPhysics, Chemistry, Astronomy, Gravity, Light, Optics, Laser, Radar, Electricity, Aether, Dark Matter, Fluid Dynamics, Force, Inertia, Electromagnetics, Atomic, Sub-Atomic, Quantum, Math, AlgorithmsJOB HISTORYAprivaJob Description: Software ContractorLocation: Hybrid/Phoenix, AZFrom: Sept 6, 2022To: Jan 31, 2024Role Description: Contracted fulltime for Apriva on a small agile team supporting their Gateway system. The system was a distributed Windows server based system connecting POS devices to transaction processors and acquirers. In a fast paced agile environment, resolved numerous production bugs on three spokes of the Gateway, containing the PG (C/C++17), HPG (C++20), and the APG (C#.NET 3.1, NUnit). Provided updates to the Gateway Web API applications as required.HSM Upgrade Project: Upgraded the Gateway utilization of Thales Luna HSM to Thales payShield 10K HSM for DUKPT decryption cyber security project. The Thales HSM supports both Triple DES (3DES) and Advanced Encryption Standard (AES) cryptographic algorithms. Created database interface for cryptographic key management via Key Set Identifier (KSI). Decryption included EMV (Europay, Mastercard, and Visa) encrypted data. The project was part of PCI Compliance (specifically Payment Application Data Security Standard or PADSS) to maintain secure encryption of cardholder data.Payment Terminal Certification Project: Provided code improvements and support to the Apriva TSYS PNI allowing certification of the PAX A920 (EMV capable) terminal through TSYS via their 1080 and 1081 specifications.Updated multiple external interfaces, such as Chase Enhanced, Fiserv Heartland Portico, Blackboard, First Data Rapid Connect, ProPay, Ingenico, and Zippin. Created an unofficial research tool to analyze BIN range data from the database. Conducted research and documentation for Jira spikes as well as associated code implementations. Handled release of software builds and packages from development, through QA and into production. Created associated database release packages.Software and tools used: Microsoft Visual Studio 2017 and 2022, .NET Core 6.0, NuGet Packages, Microsoft SQL Server Management Studio (SSMS), Transact-SQL, Redgate, Jira, Git, Postman, Microsoft Azure, Jenkins Pipeline, Atlassian Confluence, JFrog Artifactory, Pyrite virtual machine (VM) management, and Propane archival log file management tool.AT&T/AmdocsJob Description: Software ContractorLocation: Remote, AZFrom: Nov 12, 2021To: July 7, 2022Role Description: Worked fulltime for Vertogic and Cloud-Q as a senior resource to their team of overseas programmers on a system rewrite of the AT&T Local Number Portability Gateway (LNPGW) distributed system. This rewrite was part of an Azure Modernization Project to the cloud that included a re-host from HPUX servers to cloud-hosted Linux virtual machines. Many software upgrades were included with this rewrite, including removal of Rogue Wave (now Perforce) software. Rogue Wave HydraExpress was replaced with software utilizing the Apache Xerces-C++ XMLSchema specification. Rogue Wave C++ library calls and data structures were rewritten using the C++ Standard Template Library (STL). Builds were done using make and associated Makefile(s). Repository was Git in conjunction with CodeCloud Git repository management software. Process planning was Agile with three week Sprints and Jira. CORBA was replaced with cURL and Pistache REST framework for C++. Database was MySQL.System Concepts Inc.Job Description: Full Stack EngineerLocation: Scottsdale, AZFrom: May 9, 2020To: March 10, 2021Role Description: Worked fulltime for System Concepts Incorporated (SCI). This was a very small company of 14 people, and most of my responsibilities were related to fixing production issues with their restaurant accounting website, adding new features and planning new development. Development and modification of forms and wizards, while porting software away from VB6 and Active-X. Enhancements to multiple instances of their custom POS interface software. Documentation, modification, and deployment of custom build and release software. Technologies used were JavaScript, VBScript, HTML, C#.NET, VB.NET, VB6, Git, Git Bash, PowerShell, Microsoft Visual Studio, Microsoft SQL Server, Internet Information Services (IIS), Exago, GrapeCity Active Reports, multiple browsers and debuggers, Microsoft OneNote, Jira, and Salesforce.Global Payments / TSYS Acquiring SolutionsJob Description: Software Engineer LeadLocation: Tempe, AZFrom: November 1, 2012To: April 30, 2020Role Description: Worked fulltime for Total Systems (TSYS) Acquiring Solutions (which later merged with Global Payments). Performed various projects on their Batch Authorization System (BAS) distributed Windows server enterprise software environment.Twenty years as an integral part of both the TSYS (Global) BAS and Sierra Teams. BAS being a file based Batch Authorization System for Windows, using C++, VB.NET, C#.NET, and Microsoft SQL Server Management Studio (SSMS). Sierra being a High Frequency Transaction (HFT) processing platform for HPUX, using C/C++/Java and Informix. My time with both BAS and Sierra is summarized below:Working closely with an agile team to finalize the BAS Modernization projectWorking closely with product and business analysts to help create functional requirementsWorking closely with development team in position of development lead or individual contributorWorking closely with team as project lead, system architect, and master of ceremoniesWorking closely with business analysts for April and October PCI Compliance (and PADSS)Creating design documents working with development team and possibly other teamsFollowing the software development life cycle (SDLC) and integrating CICD/agileDocumenting and presenting technical design reviews for all projectsDeveloping new products and enhancements to existing products or tools using C/C++/Java/SQL in Unix for Sierra and VB/VB.NET/ASP.NET/JavaScript/C#.NET/SQL Server in Windows with BASDesigning and developing SQL tables and stored procedures for database schemaUnit testing to ensure the release of quality code that meets all requirementsCompleting release notes, unit test documents and code review documentsWorking closely with quality assurance through code release processWorking closely with configuration management through devops release processSupporting release of new code and/or systems into productionProviding 24x7 on-call support, troubleshooting, maintaining production codeApplying technical and problem solving skills when and wherever neededContributing as the teams TCP/IP and HSM encryption specialistBAS Modernization Project: This was a large project with many complexities and a large team. In its initial conception, it was simply to convert some of the soon-to-be unsupported VB code in BAS to C#.NET for future compatibility. A short list of inefficiencies within the existing BAS system were to be designed out as well. However, with management approval a paradigm shift was implemented that would modernize the system by leveraging newer technologies. CICD, Agile, Target Process, Jira, Jenkins Pipeline, Sonar, Visual Studio 2019, .NET Core 3.1, NuGet Packages, GIT, nUnit, nLog, Splunk, C# Coding Standards, Design Patterns, Micro Services, Entity Framework, UML, Enterprise Architect, Docker, and so on. A complete redesign of BAS was done. This was a pilot project with high visibility within the company as the new technologies were implemented. The new system was designed with optimal efficiency, throughput, scalability and redundancy, while maintaining a simple model that would be easily maintainable and allow portability to the Cloud in the future. Agile sprints and value stream methodologies were implemented. Led a team of three fulltime engineers, spearheaded and began rewriting the system in C#.NET using a distributed architecture and microservices.BAS 1081 Capture Project: Design, development, integration and testing of the 1081 Capture Project for settlement of third party ACH transactions. This program was built from scratch using C#.NET and Microsoft Visual Studio 2015. The code was integrated to access an existing database of BAS transactions, and convert them from the BAS 150 format to Sierras 1081 Capture format. This multi-threaded Windows service provides the TCP/IP interface to Sierra. Database table and stored procedure changes were done using Microsoft SQL Server Management Studio. Software version control was done through Microsoft Team Foundation Server.BAS Test Tool Project: Creation of a robust graphical interface to run and test BAS files. Open, parse, and display input file. Allow start and monitor progress of file. Open, parse, and display output file. Perform and display performance metrics against results. The tool included a complete QA regression capability and many other miscellaneous functions useful for batch processing. Code was written in C#.NET using Microsoft Visual Studio 2015. Database table and stored procedure changes were done using Microsoft SQL Server Management Studio. Software version control was done through Microsoft Team Foundation Server.BAS Tokenization Phase II Project: Design, development, integration and testing of changes necessary for the new Token Reporter for billing, as well as ETL interface for back end data logging. Billing code included creation of monthly report file to specified format with all tokenization requests, and configuring the report to run on a scheduled task. ETL code included creation of output file to specified format for back-end data logging. File transfer team moves files to back end and billing platforms. All coding was done in VB.NET for the Windows platform using Microsoft Visual Studio 2010. Database table and stored procedure changes were done using Microsoft SQL Server Management Studio. Software version control was done through Microsoft Team Foundation Server.BAS Tokenization Phase I Project: Design, development, integration and testing of changes necessary for the new BAS Tokenization product. Coding changes included integration of the TSYS Batch Authorization System (BAS) to the TSYS Token Server, using TCP/IP and the custom Token Server XML interface. All coding was done in VB.NET for the Windows platform using Microsoft Visual Studio 2010. Database table and stored procedure changes were done using Microsoft SQL Server Management Studio. Software version control was done through Microsoft Team Foundation Server.BASMonitor Version 1.5 and 3.0 Project: Design, development, integration and testing of miscellaneous improvements to the BASMonitor webpage. Additional work included Phase I of the Configuration Project. The BASMonitor webpage interfaces to BAS, allowing display of live and historical system information as well as allowing start/stop control over crucial BAS Windows Services and other custom monitoring functionality. Code improvements were done in VB.NET, ASP.NET, JavaScript, HTML and VB using Microsoft Visual Studio 2010. Database table and stored procedure changes were done using Microsoft SQL Server Management Studio. Target system was Windows. Software version control was done through Microsoft Team Foundation Server.TSYS Acquiring SolutionsJob Title: Software Engineer LeadLocation: Tempe, AZFrom: November 1, 2006To: November 1, 2012Role Description: Worked fulltime for TSYS Acquiring Solutions, performing various projects on their High Frequency Transaction (HFT) distributed UNIX server enterprise software environment known as Sierra.Discover DKE Project: Software development lead for Discover Dynamic Key Exchange (DKE) Project. Dynamic Key Exchange means sending new working keys once per day to Discover. The keys are then used by Discover for PIN translation. Having a key that changes every day like this improves security. To send the key to Discover it needs to be encrypted under a Key Exchange Key (KEK) that is shared between TSYS and Discover. Code was written in C++ and SQL in an HPUX and Informix environment.Tokenization Project: Acted in capacity of software development lead for TSYS Tokenization Project. The Tokenization project was a spin-off of the E2EE Project (see below for E2EE). This project was initiated when TSYS decided to create its own encryption solution for the tokenization of card numbers. Tokens are meant to replace card numbers and can be freely shared at the client end without having to worry about storing the tokens securely like a card number would need to be. These tokens can only be turned back into the original card number at the source where the token was created (TSYS). Worked closely with many teams in TSYS to develop HPUX based TCP/IP Token Server. Designed and developed a bulk tokenization tool. Code was written in C++ and SQL in an HPUX and Informix environment.E2EE Project: Acted in capacity of software development lead on the End-to-End Encryption Project (E2EE). This project was quite involved and went on for some time. The goal of the project was to have encrypted card numbers sent from the Point-of-Sale (POS) device to the TSYS transaction processing platform (Sierra). Prior to this project the only way to send the card number in the transaction was to have it unencrypted and in the clear. The project was quite large and involved many departments at TSYS, including Product, Business Analysts, Software Development, as well as Network, System Administration, Configuration Management, and Quality Assurance. Code was written in C++ and SQL in an HPUX and Informix environment.Regression Testing Tool Project: Planning and development of a regression testing tool for the QA department to allow QA to run their regression tests with little or no wasted effort. The regression tool is essentially a TCP/IP sniffer which parses and logs financial transaction information destined for Visa, MasterCard, American Express, and Discover. The concept of the tool is to log specific portions of these financial transactions to filewhile the Sierra system is processing transactions from the QA regression test set. This log file would then be compared to the log file generated from the regression of the previous version of Sierra. If there are no bugs in the new version of Sierra software, then these two log files should match. Code was written in C++ and SQL in an HPUX and Informix environment.HSM Asynchronous Socket Modification Project: Brief project involving modification of socket software interface between Sierra and the Atalla Hardware Security Module (HSM). Prior to this improvement, the software was synchronous with the socket send and receive functions in a linear section of code. This was a prohibitive architecture left over from a third party software developer. Modified this section of code to send requests to the HSM and place them into a hash table. After the modification the TCP/IP responses from the HSM would trigger an interrupt and could be processed in a more efficient manner. Code was written in C++ and SQL in an HPUX and Informix environment.MasterCard Dynamic Key Exchange (DKE) Project: Modification of the MasterCard interface software or TCP/IP messaging application to implement Dynamic Key Exchange software between the Sierra transaction processing system and MasterCard. Software was completed according to the MasterCard Customer Interface Specification (CIS). The project was necessary becauseutilizing dynamic keys which change once per day is a preferred method over a static key implementation. Worked closely with the TSYS Information Security Group to ensure the Key Exchange Key (KEK) was properly shared between TSYS and MasterCard. The KEK is used to encrypt the KPE or PEK (Pin Encryption Key) which is sent daily from MasterCard as part of the DKE.This PEK is then decrypted from under the KEK and re-encrypted under the Master File Key (MFK) before being entered into the TSYS database and used to encrypt PINs. The encryption platform used by TSYS is the HP Atalla Hardware Security Module for cyber security. Code was written in C++ and SQL in an HPUX and Informix environment.SHA-256 Cryptography Project: Created a small program for another team at TSYS that would read a list of data from an input file and output a list of SHA-256 encrypted data to another file. The SHA-256 (Secure Hash Algorithm 256-bit) is a cryptographic hash function that produces a 256-bit (32-byte) hash value. OpenSSL library was used for this C++14 project for access to the SHA-256 cryptographic algorithm.Overseas Currency Project: Designed, coded and tested a method of routing Overseas Currency transactions to specific Visa servers. This involved making modifications to the schema of the Sierra database, populating with additional data and switching off of the database contents during real-time processing. Connectivity program to Visa was modified to support new logic and routing to specific TCP/IP sockets at Visa. Code was written in C++ and SQL in an HPUX and Informix environment.Host Capture Project: In charge of designing and developing a solution for synchronizing Batch Close requests for Host Capture Project. Project allows automatic capture on TSYS servers allowing POS devices to run newer thin client code. Two design options were created for the synchronization of Batch Close operations between Host Capture Servers on East and West Coast. These designs were presented in the Technical Design Review and the better one was selected. Code was written in C++ and SQL in a UNIX and Informix environment.Platform Logging Project: In charge of implementing enhancements to the Visa Link Protocol (VLP) for Platform Logging project. VLP is an application layer protocol specific to Sierra on a TCP/IP interface. Nearly all traffic through the Sierra authorization platform comes though the VLP front-end interface. The VLP protocol was enhanced to include connectivity and security related information for the tracking of potential fraud. The technical interface documentation was created, and added to client-side specification. Additional data logged to the database and later utilized to pinpoint fraudulent authorization attempts. All code was written in C++ and SQL in an HPUX and Informix environment.Vital Processing / TSYS Acquiring SolutionsJob Title: Software Engineer LeadLocation: Tempe, AZFrom: November 1, 1999To: November 1, 2006Role Description: Worked fulltime for Vital Processing Services (later bought out by TSYS). Performed various projects on their High Frequency Transaction (HFT) distributed UNIX server enterprise software environment known as Sierra.Visa Dynamic Key Exchange (DKE) Project: Handled all aspects of DKE project to exchange encryption keys dynamically between TSYS and Visa. This included creating and presenting the Technical Design Document as well ascoding and completing a full unit test on the new software. Helped plan the DKE certification test between Visa and TSYS Quality Assurance. Created SQL and release documentation for production install. Modifications were made to TCP/IP socket-based Visa test simulator to support DKE. Java GUI screen was added and modifications were made to XML and socket interface. Development was done using C++, Java and SQL in an HPUX and Informix environment.HSM Migration Project: Worked closely with business group to refine Functional Requirements document for Hardware Security Module Migration project. Created Technical Design Document and led a small team of engineers as co-developer on this project. Completed code, full unit test, and software release documentation. Code included modifications to XML socket interface. The goal of the project was the migration of the encryption endpoint from Visa to TSYS under contractual obligation with Visa. This migration included about six thousand cryptographic Base Derivation Keys (BDKs). Cryptography at TSYS utilizes Triple DES (TDES or 3DES) via the HP Atalla Hardware Security Module encryption platform. Development was done using C++ and SQL in an HPUX and Informix environment.Velocity Monitoring Project: Project lead and co-developer on Velocity Monitoring project to eliminate fraud. Designed, coded, tested and released this database intensive application. The application maintained hash table based upon results of large database query against authorization database table. Development of algorithm and statistical analysis of data used to create decline table containing credit card numbers with too many declines during 24 hour period. Development was done using C++ and SQL in an HPUX and Informix environment.Card Tech Limited Driver Project: Created a design solution and a quick 2,000 lines of code in a couple of weeks that would simulate 24 hours of transaction processing traffic for daughter company Card Tech Limited. Target box was Linux and code was TCP/IP socket based C++ using the gnu g++ compiler. To make sure the software was able to drive up to one thousand TPS of authorizations, while simultaneously submitting live capture data, the software was programmed to have a configurable number of sockets, threads and instances.HSM Triple DES Encryption (TDES) Project: Worked closely with business group to refine Functional Requirements cryptography document for Triple DES PIN encryption project. Created project estimate and Technical Design Document. Completed code, full unit test, and software release documentation. Project connects Sierra transaction processing platform to Atalla HSM PIN encryption platform. Code included cryptographic key lookup in database via Key Set Identifier (KSI), with derivation from Key Serial Number (KSN). Modifications included Atalla HSM driver. Development was done using C++ and SQL in an HPUX and Informix environment.Encryption Analysis Project: Analyzed, compared, and benchmarked the encryption software products from Ingrian and RSA. This was done by installing both the products and writing a couple of small programs to benchmark their performance. A report was provided to management including my recommendations. This was done using C++ in an HPUX environment.POS Reporting Project: Project lead and co-developer on a large project to supply TSYS clients with transaction reports they had previously received from Visa. Responsibilities included working closely with the business department to finalize business requirements and Functional Design, working closely with my team to develop the Technical Design, and coding to this document. Wrote and tested over 4000 lines of code in about 5 weeks. Development was done using C++ and SQL in an HPUX 11i and Informix environment.System Betterment Project: Responsible for creating a Java GUI using J2SE to monitor and control the TCP/IP network interface enterprise applications connecting Vital to American Express and MasterCard. Developed additions to CDP, a custom TCP/IP based C++ data capture and routing application, as well as additions to Java TCP/IP based middleware. The Java GUI was designed using NetBeans on a Windows platform and then ported into a Rational ClearCase source control system on a development host running HPUX 11i, where it was integrated into the current Java build architecture.HPUX 11i Re-host Project: Responsible for running capacity tests on Sierra to compare the performance of HPUX 11.0 and HPUX 11i operating system versions. Created test plan and assisted in writing MasterCard, American Express, and Point of Sale (POS) stress tools/simulators with GUI interfaces for PC based benchmark test station using Microsoft Visual C++. Results from the UNIX perfview, top, and Glance Plus utilities were analyzed in a formal document and hardware upgrade recommendations were made.Visa TCP/IP Network Port Project: Project lead and developer for re-host of critical transaction processing network connection from Vital to Visa. Worked closely with Visa, the Vital networking group, the Vital Quality Assurance group and the Vital Configuration Management group in switching Vitals applications from the existing SNA/Token ring network to TCP/IP with connectivity to Visas USMG transaction server platform. Created requirements document, high level architecture document, low level design document with class definitions and coded the new multi-client interface. Created a unit test plan, functional test plan, tested and released through QA, CM, and into production. The application was interfaced to an Informix database, and UIMX/shared memory GUI, for logging statistics and for production monitoring. Debugging was done using gdb. Software version control was Rational ClearCase. Development was done using Object Oriented C++ and SQL in an HPUX and Informix environment.Batch Server (Card Not Present) Project: Project lead and co-developer for Batch Authorization complete stand-alone system for off-line processing of Vital EIS 1085 transactions. This involved creating system requirements and a new Vital EIS 1085 specification, which could easily convert to and from the Vital EIS 1080 and 1081 authorization and capture formats. Files submitted by clients in the Vital EIS 1085 format, are parsed by the batch server, converted to the 1080 and 1081 formats and submitted to Sierra (a large transaction processing system). Transaction responses from Sierra are logged in the response file, and delivered back to the client within a four-hour time frame. System design involved upfront data modeling using ERWin Entity Relationship Diagrams (ERD) for data model hierarchy relationships. Development required closely integrating the programs with an Informix database and Rogue Wave libraries. All design was subject to Vital Processing Services formal design review process. All code was thoroughly unit tested and purified per the Vital development process requirements. Development was done using Object Oriented Programming Style (OOPS) C++ for the HPUX 11.0 platform and Informix 7.31. Borland JBuilder Java was used to create the GUI interface.IP Direct Project: Responsibilities included researching the existing system, generation of requirements, high level and low level design, development, test, documentation and integration of IP Direct software for connecting Merchant Host platforms directly to Sierra via a TCP/IP interface. The IP Direct interface was designed to accept ISO 8583 transaction formats (Visa, Amex, Master Card, etc). Duties included closely interfacing with QA, certification, and production departments to see the project from its initial phases all the way through into production. Created all |
