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Full-stack developer with 2+ years of experience building enterprise systems for government agencies, specializing in microservices, backend architecture, and secure identity integration. Hands-on with Keycloak and OAuth2/OpenID Connect flows, JWT/JWKS verification, and role-based access control for reliable SSO. I’ve delivered production-grade APIs and platforms across HR/payroll/taxation, identity management, and e-learning. Strong background in security (PII encryption, layered auth middleware), PostgreSQL/MSSQL performance work, and end-to-end delivery from requirements to deployment and post-launch support.…Full-stack developer with 2+ years of experience building enterprise systems for government agencies, specializing in microservices, backend architecture, and secure identity integration. Hands-on with Keycloak and OAuth2/OpenID Connect flows, JWT/JWKS verification, and role-based access control for reliable SSO. I’ve delivered production-grade APIs and platforms across HR/payroll/taxation, identity management, and e-learning. Strong background in security (PII encryption, layered auth middleware), PostgreSQL/MSSQL performance work, and end-to-end delivery from requirements to deployment and post-launch support.

Paphunpong Neuangkota

Full Stack Developer, Back-End Developer, Front-End Developer, +2

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Full-stack developer with 2+ years of experience building enterprise systems for government agencies, specializing in microservices, backend architecture, and secure identity integration. Hands-on with Keycloak and OAuth2/OpenID Connect flows, JWT/JWKS verification, and role-based access control for reliable SSO. I’ve delivered production-grade APIs and platforms across HR/payroll/taxation, identity management, and e-learning. Strong background in security (PII encryption, layered auth middleware), PostgreSQL/MSSQL performance work, and end-to-end delivery from requirements to deployment and post-launch support.…Full-stack developer with 2+ years of experience building enterprise systems for government agencies, specializing in microservices, backend architecture, and secure identity integration. Hands-on with Keycloak and OAuth2/OpenID Connect flows, JWT/JWKS verification, and role-based access control for reliable SSO. I’ve delivered production-grade APIs and platforms across HR/payroll/taxation, identity management, and e-learning. Strong background in security (PII encryption, layered auth middleware), PostgreSQL/MSSQL performance work, and end-to-end delivery from requirements to deployment and post-launch support.

Available to hire

Full-stack developer with 2+ years of experience building enterprise systems for government agencies, specializing in microservices, backend architecture, and secure identity integration. Hands-on with Keycloak and OAuth2/OpenID Connect flows, JWT/JWKS verification, and role-based access control for reliable SSO.

I’ve delivered production-grade APIs and platforms across HR/payroll/taxation, identity management, and e-learning. Strong background in security (PII encryption, layered auth middleware), PostgreSQL/MSSQL performance work, and end-to-end delivery from requirements to deployment and post-launch support.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Beginner

Language

Thai

Fluent

Lao

Advanced

English

Advanced

Work Experience

Full-Stack Developer at Advanced Innovation Technology Enterprises (Government systems on microservices platform)

October 1, 2025 - August 1, 2026

Worked on a microservices platform for government agencies across identity management, HR/payroll/taxation, and e-learning. Built secure SSO/identity integrations using Keycloak with OAuth2/OIDC, implementing JWKS/JWT signature verification and full token lifecycle handling. Developed and maintained REST APIs with layered auth middleware, RBAC, auditing, and comprehensive Swagger/OpenAPI coverage. Implemented encryption of sensitive national/personal/tax identifiers with SQL Server column-level PII encryption and addressed non-deterministic SQL cipher issues by redesigning record-matching strategies. Recovered deleted production records via reconstruction from SQL Server transaction logs using fn_dbLog() when backups were unavailable. Owned payroll ingestion pipelines with a multi-stage validate/draft/confirm/cancel flow to prevent partial writes, plus PDF engine generation for statutory Thai tax documents with digital signatures, watermarking, and PDPA-oriented protections. Shipped

Full-Stack Developer at Freelance (Independent contractor)

April 1, 2024 - September 1, 2025

Delivered production web and mobile applications end-to-end, integrating backend services with frontend/mobile UIs and focusing on reliable authentication and role-based access patterns where needed.