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Feniks Pham

@fenikspham

Backend Software Engineer with 4 years of experience in Java/Spring Boot, Python/FastAPI, distributed systems, and production AI applications.

Vietnam

Message

Backend-focused Software Engineer with 4 years of experience designing, building, and operating production services across billing, resource lifecycle, and platform integrations. Strong in Java/Spring Boot, distributed and event-driven systems, data correctness, and production debugging, with recent ownership of production AI systems built with Python/FastAPI.

Experience

Work history, roles, and key accomplishments

Senior Software Engineer

VNG Corporation

Jul 2025 - Apr 2026 (9 months)

Architected and owned the core implementation of a production AI agent for Redmine, built with Python, FastAPI, LangChain and LangGraph. Owned end-to-end development and production rollout of an internal RAG assistant covering 1,000+ pages of documentation, improving retrieval pass rate from ~90% to ~99%.

Python fastAPI Lang Chain LangGraph RAG Retrieval Reranking Data filtering Indexing Authorization Audit Logging Mentorship

Software Engineer

VNG Corporation

Jul 2024 - Jun 2025 (11 months)

Diagnosed and fixed a usage-closing job by identifying a missing MongoDB index, cutting runtime from ~90 minutes to under one minute. Designed and built a production monthly-cost estimation pipeline with idempotent recomputation and cluster-wide CAS locking, and co-designed coupon-preserving billing for mid-cycle resource resizes.

MongoDB Indexing Performance Optimization RabbitMQ Billing Cost Estimation Idempotency CAS Locking Angular Spring Boot Payment Integration Provisioning

Associate Software Engineer

VNG Corporation

May 2022 - Jun 2024 (2 years 1 month)

Developed centralized lifecycle support for multiple infrastructure products through a shared billing and payment pipeline with RabbitMQ-driven asynchronous provisioning. Implemented a unified resource-billing layer across legacy and migrated product backends, and built features for a new Pricing Calculator product including batch price-estimation API and SKU mapping.