Backend Engineer specializing in distributed architectures, scalable microservices, and polyglot datastores.

Backend Engineering   Distributed Systems   AI Systems   Startups

Backend Engineer focused on high-concurrency architectures, polyglot datastores, and production reliability.

• Microservices & DDD: Modular NestJS services engineered with CQRS and domain event patterns.
• Polyglot Datastores: PostgreSQL, MongoDB, Cassandra (telemetry), Neo4j (social graph), Hive (OLAP).
• Caching & Rate Limiting: Low-latency Redis caching, cluster-wide rate limiting, and IP-level lockouts.
• Queues & Concurrency: Asynchronous background job processing and pipelines via RabbitMQ, BullMQ, and Redis.
• Real-Time Communications: Event-driven real-time chat and state synchronization via WebSockets (socket.io).
• APIs & Security: OpenAPI/Swagger documentation, strict Zod validation, structured logging, and token security.

I build practical AI applications, retrieval pipelines, and autonomous agent workflows:

• Retrieval-Augmented Generation (RAG): Building semantic search and question-answering systems over large document collections (legal statutes and learning materials) using vector search and embeddings.
• AI Business Analytics: Automated data analysis pipelines that turn business metrics into AI-generated insights, summaries, and executive reports.
• AI Agents & Automation: Building reliable workflows, tool-calling capabilities, and guardrails for autonomous AI agents to execute complex developer tasks.
• Application Integration: Embedding conversational assistants, smart content generation, and real-time collaborative AI features directly into production web backends.

_{Asset provenance documented in SOURCES.md.}

• Rentify (CEO) — SaaS commerce platform and marketplace for Cambodian SMEs, providing merchant management, customizable storefronts, POS, and KHQR-ready checkout.
• Coorad (Developer) — Technology startup building digital platforms; engineered the internal Angkoro Admin portal for Angkoro to handle platform operations, merchant governance, and administrative oversight.
• OpenFullDive (Solo R&D) — Personal research and development project exploring immersive digital worlds and interactive systems.

Building resilient systems. Architecting scalable backends. Always shipping.