John A.
Senior Machine Learning Software Engineer
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John Angelo S. is a Senior Software Engineer with 12 years of experience specializing in building scalable backend systems, AI/ML platforms, and full-stack applications across fintech, SaaS, cloud infrastructure, and e-commerce. At Oscilar, he architected core machine learning systems for an AI risk decision platform used by fintechs, delivering real-time fraud detection models and low-latency inference services with technologies like Python, XGBoost, FastAPI, and Kafka. His work included developing NLP pipelines for risk signal extraction and RAG-based fraud investigation tools. At Docker, he designed backend services for Docker Hub’s global container registry using FastAPI and PostgreSQL, while optimizing CI/CD and observability with tools such as Docker and Prometheus. His prior roles in enterprises like Octopus Deploy, White Cloak Technologies, and Startechup involved release automation, banking platforms, and e-commerce solutions leveraging React, Spring Boot, and Django.
Experience
Senior Software Engineer (AI / Machine Learning)
Oscilar · 2023 — 2026Developed core systems for an AI risk decision platform serving fintech applications, involving the design and deployment of real-time fraud detection models with XGBoost and the creation of low-latency ML inference services utilizing Python and FastAPI. Scoped event-driven data pipelines through Kafka and Redis Streams, and constructed AI risk evaluation engines to assess onboarding, behavioral, and transaction activity for fraud detection. Created a RAG-based fraud investigation assistant using LangChain and OpenAI APIs, in addition to building NLP pipelines with PyTorch and HuggingFace for extracting risk signals. Oversaw deployment of scalable ML services using Docker and Kubernetes on AWS EKS, enabled analytics dashboards through React and TypeScript, supported fraud analysts and data teams to refine risk models, and mentored junior engineers throughout platform development.Full Stack Developer
Docker · 2020 — 2022Engineered backend services for Docker Hub container registry infrastructure using Python, FastAPI, PostgreSQL, and Redis to automate workflows. Shaped distributed service architectures to support high-availability container registry functions, while implementing CI/CD pipelines with GitHub Actions and Jenkins. Developed Terraform templates for automated infrastructure provisioning across environments and built React and TypeScript dashboards for infrastructure visualization. Advanced system observability through integration of Prometheus and Grafana.Mid-level Developer
Octopus Deploy · 2018 — 2020Contributed to an enterprise release automation platform by constructing backend automation services with Python, Flask, and Django for deployment orchestration and pipeline management. Designed data models with PostgreSQL and Elasticsearch for analytics and audit logging, integrated Docker and Jenkins for deployment workflows, and delivered Vue.js dashboards for real-time deployment status monitoring. Implemented automated testing pipelines to support enterprise reliability.Full Stack Developer
White Cloak Technologies · 2015 — 2017Developed fintech solutions, specifically for UnionBank Online banking, by building backend services in Java Spring Boot to facilitate authentication, payments, and banking operations. Constructed REST APIs for transaction handling and financial integrations, produced responsive React interfaces for dashboards and operational tools, and created relational database schemas to enable secure processing of financial transactions.Web Developer
Startechup Inc. · 2013 — 2015Built e-commerce platforms leveraging Django and JavaScript frameworks for retail operations, implemented payment gateway integrations, managed order and customer account workflows, and optimized database queries and caching strategies for improved system performance during peak demand.
Skills & Expertise
Education
- Bachelor’s Degree of Computer ScienceNational Taiwan University (NTU) · 2009 — 2013