Relocated for spouse's job. Worked at Kindle, on the Japan Manga team, building web promotions for manga content on the Amazon retail website. One of my projects generated an annual revenue of ¥1.54 billion ($11 million).In this role, I:• Contributed to diverse codebases (Java, Kotlin, TypeScript, Ruby)• Collaborated with other teams, across multiple time-zones• Managed both hosted and serverless systems• Conducted code reviews and experiment design reviews (also for external teams)• Participated in on-call rotations, investigating latency concerns, monitoring system performance

Worked on AWS customer managed prefix lists feature, a simpler way to reference CIDR blocks in AWS configuration. Utilized Java with AWS Lambda, SQS & DynamoDB, for an IaC serverless system.

Worked on a small team to extend and maintain a legacy point-of-sale payment distributed system, with embedded components. Integrated proprietary 3rd-party hardware peripherals using an I2C bus accessible via RS232 endpoints, fostering a close collaboration with the hardware team. Ensured the system could operate with or without internet access.In this role, I:• Contributed to a C# codebase, utilizing LINQ, Windows Forms, WPF and ASP.NET. CI/CD & source control tooling included: TFS, VSTS, git & subversion• Investigated & fixed legacy multi-threading deadlocks• Conceived of and developed an efficient, asynchronous, log analysis & visualization tool• Initiated, built & advocated use of a software simulator of the hardware, accelerating development (later turned crucial for remote teams with no access to lab hardware)• Modified communication protocols between CPU and peripherals' I2C controller chips• Implemented inter-system communications over IP• Integrated with payment processors (via internet & modem-based dial-up channels)• Implemented best effort RAM private data encryption for PCI/DSS• Adapted UI per new requirements (Windows Forms, ASP.NET & WPF)• Dealt with diverse hardware, e.g. RFID readers, card readers, bill and coin collectors, EMV chip technology, proximity sensors, relays, etc.• Updated code interface to SQL Server and reporting queries• Trained team on the philosophy, internals and usage of git for source control• Employed hex editors, Wireshark, WinDbg+SOS.dll (debugging memory leaks), and other debug tools

Contributed to a web API, for a healthcare startup, catering to both mobile and web platforms. Responsibilities included collaborating on a Laravel (PHP) REST API fronting a MySQL database, writing maintenance scripts, implementing a calendar scheduling system, and testing with Postman.

Contributed to a financial accounting web application, powered by ASP.NET and a large SQL Server database, with 100+ GB of financial data, for clients such as PNC bank & WEX Inc.In this role, I:• Developed in C#, HTML, JavaScript & CSS, utilizing ASP.NET, LINQ, jQuery, nUnit & MsTests• Conducted post-mortem analysis of application failures, identifying & fixing root cause throughout the stack, including data recovery• Collaborated with clients (directly and indirectly) and multitasking under time constraints

Designed and built a C# framework for verifying algorithm implementation correctness, of a signal processing system, and integrating it into a TFS CI pipeline. This framework immediately allowed us to find & rectify algorithm implementation errors found in the system under test.In this role, I:• Collborated with a MATLAB team to acquire test data• Built a tool (WPF C#) to convert test data between various file formats• Built a tool (WinForms C#) to resolve 100+ conflicting DLL dependencies, saving significant time and effort• Developed .NET automated web-based reporting tools• Used WinDbg+SOS.dll to investigate memory leaks from assembly loading & unmanaged resources• Mentored junior programmers• Conducted developer interviews• Gave a talk about WinDbg+SOS.dll and hex editors

Designed and developed a large-scale signal processing system, collaborating with electrical engineers, mathematicians and physicists. The system comprises of more than a dozen computer cores, some running Windows XP with C#/C++ components, while others without any OS, running C real-time code, in order to fulfill strict timing constraints.In this role, I:• Implemented sophisticated situational awareness algorithms, early warning and other tactical capabilities, mainly in C#• Designed and implemented communication interfaces between the various cores and with external systems, employing .NET interop and serialization techniques, over RS-232 & Ethernet links• Wrote real-time C code, integrating the software with proprietary hardware• Ported legacy C code into C#, applying OOP principles, parallelization & bug fixes• Implemented file transfer over an SDLC data link (C & C++)• Implemented a USB interface to propriety hardware, using the EZ-USB driver• Maintained CodeSmith™ & Perl scripts for C# code auto-generation of a distributed database implementation• Simulated hardware components in software, to enhance testing and to facilitate end-user offline training simulations• Joined off shore experiments, testing and debugging at sea, using MATLAB for analysis• Resolved issues when lacking source code, using a .NET reflector, and other times with a disassembler & hex editor• Documented previously undocumented code & protocols