Nazrul Islam · Sylhet, BD
Software Engineer
I love working on the back of the systems — the parts no one sees but everything depends on. Curious by nature, I dig deep into how things actually work under the hood. Problem solver at heart, backend engineer by craft.
Experience
authLab
Software Engineer
Jan 2026 – Present · Sylhet, Bangladesh
- Building an LLM-powered agent to automate and assist support ticket responses
- Implementing RAG architecture using LangChain for contextual document retrieval
- Developing scalable backend services with FastAPI and integrating vector database for semantic search
- Using Redis for caching to improve performance and reduce response latency
Recurse AI
Software Engineer
Feb 2025 – Jan 2026 · Hybrid, Sylhet, Bangladesh
- Built and maintained backend systems using FastAPI and Django
- Developed AI-driven applications integrating LangChain, RAG, and LLM-based technologies
- Key contributor to ClearVocals.ai — the company's first AI product
- Worked on AI-based voice separation and video dubbing features
- Built secure authentication using PyJWT and Google OAuth 2.0
- Integrated Stripe payment gateway for seamless transactions
- Integrated OpenAI and Anthropic LLM APIs for intelligent features
- Worked with Cloudflare R2 buckets and Cloudflare Workers for storage and serverless functions
- Deployed open-source ML models (Nari Dia 1.6B, Kyutai TTS, Fish Speech S1-mini) on cloud
- Implemented caching using Redis for efficient job management
Education
BSc in Computer Science and Engineering
Shahjalal University of Science and Technology (SUST), Sylhet
Feb 2020 – June 2025 · CGPA: 3.64 / 4.00
Skills
GoPythonTypeScriptC++Rust
FastAPIDjango
MySQLMongoDB
AWSAzure
REST APIsWebSocketGitLangChainRAGSwaggerRedisDockerCI/CDNginxLinuxGraphQL
Competitive Programming
- Expert on Codeforces (Max rating: 1832)
- 5 Star on Codechef
- 6th – CoU IUPC 2023
- 11th – SEC IUJPC 2022
- 13th – BUET IUPC 2024
- 15th – IUT IUPC 2024
- 3500+ problems solved on Codeforces, Codechef, LightOJ, SPOJ, AtCoder, etc.
- Problem Setter & Judge – SUST Intra University Programming Contest 2024
- CP Mentor – CP Lab, SUST