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John Angelo Santos

@johnangelouser

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Senior software engineer specializing in distributed, event-driven backend systems and production ML inference.

Philippines

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What I'm looking for

I’m looking to build low-latency, cloud-native distributed systems—shipping microservices, Kafka-driven architectures, and production ML inference—within teams that value reliability, strong engineering practices, and measurable performance improvements.

I’m a Senior Software Engineer with 10+ years building backend and distributed systems using Java, Python, and Node.js. I specialize in microservices, REST APIs, event-driven architectures (Kafka), and cloud-native applications across AWS and Kubernetes.

I integrated machine learning models (PyTorch, XGBoost, Scikit-learn) into production for real-time risk evaluation—improving decision accuracy while keeping systems responsive under load. In my recent work, I built low-latency backend services that achieved sub-100ms response times during high transaction volumes.

I design for reliability and performance: I’ve implemented Kafka-based architectures, PostgreSQL schema design, and Redis caching that reduced data retrieval latency by ~40%. I also build CI/CD pipelines (Jenkins, GitHub Actions), wrote unit and integration tests (PyTest, JUnit, Jest), and continuously investigate production issues to maintain stable performance.

Across past roles, I’ve shipped scalable systems—from building REST APIs for container registry operations and asynchronous workflows (Celery/background jobs) to delivering deployment automation services with microservices migration. I’m motivated by measurable outcomes: reduced latency, improved throughput, and production-grade ML and backend experiences.

Experience

Work history, roles, and key accomplishments

Senior Full Stack/AI Engineer

Oscilar

Feb 2023 - Apr 2026 (3 years 2 months)

Built low-latency backend services for an AI risk decisioning platform, achieving sub-100ms response times at high transaction volumes. Designed Kafka event-driven architectures and REST APIs, implemented ML inference pipelines, and reduced Redis cache read latency by ~40% while improving deployment time by ~35%.

Java Python Spring Boot NestJS Kafka REST APIs PostgreSQL Redis AWS Kubernetes

Full Stack Developer

Docker

Apr 2020 - Dec 2022 (2 years 8 months)

Developed and maintained REST APIs for Docker Hub, improving performance for image and repository operations by reducing latency from ~200ms to ~120ms. Built async background workflows with Celery, optimized high-volume image push/pull handling, and supported AWS-based multi-region storage with Docker/Kubernetes.

Python REST APIs Celery PostgreSQL Redis Docker Kubernetes AWS React

Mid-level Developer

Octopus Deploy

Feb 2018 - Feb 2020 (2 years)

Built backend REST APIs for deployment workflows and release orchestration using Java (Spring Boot) and Node.js. Reduced deployment endpoint response latency from ~100ms to ~40ms, contributed to microservices migration, and improved reliability of multi-environment CI/CD pipelines.

Java Spring Boot Node REST APIs Microservices SQL Server CI CD Junit Agile Scrum React

Full Stack Developer

White Cloak Technologies

Dec 2015 - Nov 2017 (1 year 11 months)

Developed Java (Spring Boot) backend services for UnionBank Online, building REST APIs for account management, payments, and fund transfers. Implemented OAuth and MFA authentication/authorization, supported AWS infrastructure for high-volume transactions, and improved production reliability for real-time transaction workflows.

Java Spring Boot REST APIs OAuth MFA AWS Microservices React Authentication Authorization

Web Developer

Startechup Inc.

Dec 2013 - Oct 2015 (1 year 10 months)

Built e-commerce web applications using PHP (WordPress, Laravel) and Python (Django), including customized WordPress themes/plugins for content and commerce. Implemented REST backends and database designs (MySQL/PostgreSQL), integrated payment and shipping services, and delivered responsive UI with AngularJS and jQuery.