Do Duy Khanh
Software Engineer
Software Engineer focused on backend systems, applied AI, and systems tooling.
(+84) 355-297-516
Ha Noi City, Vietnam
Education
Dual Degree CandidateThang Long UniversityHanoi, Vietnam
B.S. in Artificial Intelligence(GPA: 3.32/4.0)
Feb 2023 - 2027 (Expected)B.S. in Information Technology(GPA: 3.28/4.0)
Sep 2022 - Sep 2026Work Experience
Aug 2025 - Oct 2025• Hanoi, Vietnam
- Developed cross-platform mobile LMS application for Mankai Japanese learning platform using React Native 0.81, Expo SDK 54, and TypeScript.
- Architected JLPT mock exam simulation engine (N5-N1) featuring multi-section test navigation, dynamic real-time scoring, countdown timers, and answer analysis.
- Integrated expo-audio and expo-speech modules to deliver interactive audio listening comprehension and speech synthesis with playback controls and speed adjustments.
- Optimized network efficiency and state management using TanStack React Query v5, implementing offline query caching and optimistic UI updates for unstable network conditions.
Technical Projects
Ultimate History Map| Lead Backend and Systems Architect(4 members)
2024 - 2025
Technologies: Go, Fiber v3, PostgreSQL, PostGIS, pgvector, Redis Streams, Docker, Next.js
- WebGIS and Spatio-Temporal Mapping: Modeled historical territories, geopolitical entities, and border shifts using PostGIS and PostgreSQL; streamed MBTiles vector map layers with dynamic coordinate projection.
- Battle Simulation and Replay Engine: Architected chronological battle replay system tracking military troop trajectories, tactical phases, and dynamic territorial control on the interactive map.
- Historical RAG and Conversational AI: Built domain-specific AI chatbot using pgvector and LangChain Go, achieving 82.5% Context Recall and 0.68 MRR (Ragas evaluation).
- High-Performance Architecture: Architected modular Go Fiber v3 backend with Redis Streams; sustained 5,000 VUs at 2,548+ RPS (0.00% error rate) on an Intel N150 server.
Nghe An - Ha Tinh Dialect ASR and Translation| AI and Systems Engineer(Solo)
2025
Technologies: Python, PyTorch, Whisper, LoRA/DoRA, ONNX Runtime Web, ChromaDB, FastAPI
- Parameter-Efficient Fine-Tuning: Fine-tuned vinai/phowhisper-base using DoRA (Weight-Decomposed LoRA), training only 313K parameters (0.315% weights) and reducing loss from 2.81 to 1.094.
- Client-Side ONNX Acceleration: Quantized and exported adapter weights into ONNX format, enabling zero-server-latency in-browser speech recognition via ONNX Runtime Web.
- Hybrid 3-Tier Retrieval: Engineered dialect translation engine combining n-gram exact lookup (574+ terms) and dense ChromaDB vector search (bge-m3 embeddings).
- LLM Context Conditioning: Orchestrated DeepSeek LLM via asynchronous FastAPI server, conditioning generation on retrieved dialect definitions to translate Nghệ Tĩnh idioms into standard Vietnamese.
NovelHub| Full-Stack and Systems Creator(Solo)
2025 - 2026
Technologies: Go, Fiber v3, SQLite WAL, FTS5, React 19, TypeScript, Tailwind CSS
- Universal Multi-Format Engine: Built self-hosted digital library reader with pure-Go converter supporting 25+ formats and zero external runtime dependencies.
- Full-Text Search and Worker Pool: Implemented SQLite FTS5 unicode full-text search and architected bounded worker queues with Pond v2 for asynchronous file conversions.
- Protocol and Ecosystem Integration: Implemented native RFC 4918 WebDAV server and OPDS 2.0 catalogs for seamless sync with e-readers (Kobo, Kindle) and mobile apps.
- Structural Book Doctor Engine: Created deep diagnostic and auto-repair pipeline for corrupted EPUBs, repairing malformed XHTML and rebuilding navigation structures.
Technical Skills
Programming Languages: TypeScript, Python, Go, SQL
Backend Architecture: Fiber (Go), Nestjs, FastAPI, gRPC, Message Queue
Databases and Storage: PostgreSQL, MongoDB, Redis, MinIO/S3
Frontend and Mobile: Next.js, React Native, Tailwind CSS, Zustand
AI and Machine Learning: PyTorch, LangChain, RAG Systems, Vector DB
DevOps, Cloud and Protocols: Docker, Linux, CI/CD (GitHub Actions), OAuth2/OIDC
Honors and Certifications
Semifinalist – VietChain Talents — 1matrix
Sep 2025Certificate in Unity Game Development — ITPlus Academy
Oct 2023First Prize – Category A, TFI Spring — Thang Long IT Club
2023