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Nathaniel Matignas

@nathanielmatignas

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I build scalable backend payment, fraud-protection, and enterprise systems using Java and Python.

Philippines

Message

I've built backend systems for Vesta through Ubiquity Global Services Philippines, supporting payment and fraud-protection products with Java, Spring Boot, microservices, gRPC, REST APIs, and MSSQL.

I led a transition toward Spring Boot microservices for products including Payment Guarantee and Payment Protect. I also delivered a centralized configuration API with per-client feature flags, reducing SRE and DBA manual workload by approximately 40–50%.

More recently, I've developed Python integration services using FastAPI, SQLAlchemy, AsyncIO, and PostgreSQL for API migrations and modern microservice interoperability. By refactoring synchronous services to asynchronous execution and optimizing queries, I improved endpoint latency by up to approximately 20–40% depending on workload.

Earlier at Tsukiden Global Solutions, I delivered enterprise and R&D tools in Java, C#, Python, and Ruby, including an OpenCV camera-detection system and a COBOL-to-Java transcoder. I enjoy translating requirements into reliable software, collaborating across engineering and operations teams, and mentoring developers.

Experience

Work history, roles, and key accomplishments

Senior Software Engineer

Ubiquity Global Services Philippines Inc.

Oct 2021 - Jun 2026 (4 years 8 months)

Developed and maintained Spring Boot microservices for payment and fraud-protection products, led transition to Java Spring Boot and Microservices via gRPC, and designed RESTful APIs. Reduced operational workload for SRE/DBA teams by 40-50% and mentored junior engineers, improving onboarding efficiency by 30%.

Java 11 Spring Boot Microservices gRPC MSSQL REST APIs Azure DevOps OpenLens Git Jira Confluence Agile Scrum Python fastAPI SQLAlchemy AsyncIO PostgreSQL

Mid Software Engineer

Ubiquity Global Services Philippines Inc.

Nov 2020 - Oct 2021 (11 months)

Developed and enhanced backend features in Java 8, integrating with MSSQL stored procedures and REST APIs. Optimized stored procedure interactions, reducing execution time of key workflows by 15-25%.

Java 8 MSSQL REST APIs XML Stored Procedures Bitbucket Jira Confluence Agile Scrum

Software Engineer II

Tsukiden Global Solutions Inc.

May 2019 - Nov 2020 (1 year 6 months)

Led and contributed to multiple software development and R&D projects involving Java, C#, Python, and Ruby for Japanese enterprise clients. Designed and developed OEM research tools, a camera detection system using OpenCV, and a COBOL-to-Java transcoder.

Java C#Python OpenCV Ruby Ruby on Rails Oracle SQL XML REST APIs AWS JSP Websphere Junit SVN Agile

Software Engineer I

Tsukiden Global Solutions Inc.

Jul 2017 - May 2019 (1 year 10 months)

Developed and enhanced application features using Ruby and Ruby on Rails under Linux (CentOS) environments, and supported web application development using Java-based technologies. Performed unit and integration testing and maintained version control using SVN.