Jay Bryant Casilang
Jay Bryant Casilang

Senior Full-Stack Engineer

Open to offers · Member since 14 Sep 2026
Message
Location
Malolos, Philippines
Desired salary
Unspecified
Work preference
Remote Only
Experience level
Senior

About

Professional summary

I am a Senior Full-Stack Engineer with more than nine years of experience designing, delivering, and owning production web applications end to end. I specialize in building scalable React and TypeScript front ends alongside Python backend services.

I build responsive, accessible user interfaces and robust APIs using React, FastAPI, Django, REST, GraphQL, WebSockets, and event-driven architectures. My experience spans healthcare, investment banking, predictive maintenance, enterprise applications, and supply-chain platforms.

I work extensively with PostgreSQL, MongoDB, Redis, Supabase, and cloud platforms including AWS, Azure, and Google Cloud. I have deployed and operated containerized services using Docker, Kubernetes, Terraform, Helm, and CI/CD pipelines.

I prioritize code quality, testing, security, observability, and reliable delivery. My engineering practices include TDD, automated testing, code review, OAuth 2.0 and OIDC security, monitoring with Prometheus and Grafana, and distributed tracing with OpenTelemetry.

I am an active adopter of AI-assisted engineering workflows, using tools such as Claude Code, Cursor, GitHub Copilot, and Codex to accelerate implementation, refactoring, debugging, test generation, and documentation while maintaining strong quality standards.

I am based in Malolos, Bulacan, Philippines, and am open to remote roles without sponsorship requirements.

Skills

45 capabilities

Tech stack & tools

Working toolkit

Experience

Career history

Senior Full-Stack Engineer Optum (UnitedHealth Group)

I build and own full-stack features for a healthcare claims and prior-authorization platform serving more than 10,000 concurrent users at 99.95% availability. I develop responsive React and TypeScript interfaces for claims review, eligibility, and authorization workflows, supported by FastAPI REST and GraphQL services, PostgreSQL, MongoDB Atlas, SQLAlchemy, and Redis caching.

I also develop AI-assisted clinical coding and automation services using Python, AWS Bedrock, RAG pipelines, and OpenSearch vector search. I secure APIs with OAuth 2.0, OIDC, and JWT; deploy services on AWS EKS using Kubernetes, Helm, and Terraform; maintain GitLab CI quality gates with SonarQube; and monitor systems through OpenTelemetry, Prometheus, and Grafana.

Full-Stack Engineer Seven Seven

I built a real-time trade-settlement and collateral-risk platform for an investment-banking client. I delivered React and TypeScript dashboards with WebSocket-driven updates that gave operations and risk teams live visibility into failed settlements, unmatched transactions, and collateral positions.

I built FastAPI-based, event-driven Python services using Kafka and Celery for high-volume trade and risk processing. I worked with MongoDB, PostgreSQL, Redis, OAuth 2.0, OIDC, PingFederate, Jenkins, GitLab CI, and Azure to support secure, low-latency workflows.

Full-Stack Developer ING Business Shared Services (now ING Hubs Philippines)

I built Node.js services and React/TypeScript dashboards for a telemetry and predictive-maintenance platform processing high-volume equipment data. I created real-time monitoring experiences with React, TypeScript, and RxJS to support proactive maintenance insights.

I implemented Kafka event pipelines for sensor and telemetry streams, designed MongoDB and PostgreSQL data models, and enforced role-based access control. I containerized services with Docker on AWS and supported modernization to Google Cloud Platform using GKE and Cloud Storage while maintaining CI pipelines in an Agile team.

Full-Stack Developer Accenture

I developed enterprise web applications with JavaScript and TypeScript front ends and service-oriented backend systems following MVC architecture. I built REST and SOAP integrations and managed XML data flows through IBM Integration Bus.

I also developed serverless APIs with AWS Lambda, configured IAM roles and network-security controls, and supported service migration to Pivotal Cloud Foundry and containerized deployment environments.

Software Developer RCG Global Services

I delivered full-stack functionality for an order-management and supply-chain integration platform connecting warehouse, billing, inventory, and logistics systems. I developed REST and SOAP integrations and asynchronous workflows using RabbitMQ and IBM MQ.

I designed and tuned relational database schemas and stored procedures to support transactional consistency. I also established Jenkins-based CI workflows and managed source control using Git and SVN.

Education

Learning history

Bulacan State University

Bachelor of Science, Computer Science

Bachelor of Science in Computer Science.

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