I design and build systems end-to-end — from data modeling and authorization logic to API contracts, background processing, and deployment. 3+ years owning production backends across multi-tenant SaaS, financial workflows, secure messaging, RAG pipelines, and biometric systems. I choose tools on trade-offs: NestJS for structured backends, Go for performance-critical services, Python for data and ML, Next.js for product frontends.
🔍 Open to Backend Engineer, Full-Stack Engineer, and AI/Backend roles — remote or Dhaka-based.
Multi-tenant CRM serving 10,000+ users — 6-role RBAC, schema-partitioned tenancy, 50+ APIs, 45% latency reduction via composite index optimization.
NestJSPostgreSQLPrismaDockerJWT/RBAC
Multi-tenant accounting platform with double-entry bookkeeping, idempotent money-moving endpoints, AR/AP workflows, and full financial reporting.
DjangoDRFNext.jsPostgreSQLRBAC
Role-based student management ERP handling 10,000+ learners — enrollment workflows, permission-aware dashboards, 40% performance improvement.
Next.jsTypeScriptMongoDBPrismaJWT/RBAC
Multi-tenant SaaS POS — tax engine, discount engine, inventory orchestration, atomic checkout flows, event-driven audit logging.
NestJSNext.jsElectronPostgreSQLTypeScript
Enterprise RAG knowledge platform — document ingestion, vector retrieval, and citation-backed responses. ML treated as a production subsystem, not an experiment.
PythonFastAPIpgvectorFAISSOpenAI
Offline, consent-based face recognition using MTCNN + FaceNet + FAISS. Offline inference was a deliberate architectural choice to eliminate data exfiltration risk and simplify trust boundaries.
PythonFAISSSQLiteFastAPI
Secure messaging backend in Go with encryption-oriented architecture and operational simplicity as first-class concerns.
GoPostgreSQL
AI-augmented community platform — threaded discussions, real-time messaging, AI-assisted moderation, and trust & safety workflows.
FastAPINext.jsMongoDBPythonTypeScript
| Layer | Tools |
|---|---|
| Languages | TypeScript · Python · Go · JavaScript · SQL · C++ |
| Backend | Node.js · NestJS · Express · FastAPI · Django/DRF |
| Frontend | Next.js · React · Redux · Tailwind CSS |
| Databases | PostgreSQL · MongoDB · MySQL · SQLite · pgvector · FAISS |
| Infrastructure | Docker · Kubernetes · AWS · GitHub Actions · Vercel · Render |
| Engineering Practices | Multi-tenancy · RBAC · JWT · System Design · Idempotency · Audit Logging |
| AI / ML | RAG · OpenAI · Gemini · scikit-learn · FAISS · pgvector · MTCNN · FaceNet |
| Metric | Detail |
|---|---|
| 👥 10,000+ users | across 3 production systems |
| ⚡ 45% latency reduction | via query optimization and composite indexing |
| 📈 40% performance improvement | across major platforms |
| 🎓 1,500+ engineers mentored | in system design and backend architecture |
| 🧩 1,000+ problems solved | DSA and algorithmic challenges |
| 📦 6 published packages | Python (PyPI) and Node (npm) |
| 🗂️ 36 GitHub projects | spanning 5+ problem domains |
Python (PyPI)
xerror— AI-powered error explanation CLI for multi-language developer workflows · PyPICacheFlight— Request deduplication and cache utilitypy-onesend— Unified notification sending abstractionpy-trashguard— Input sanitization and validationpy-humantime— Human-readable time formatting
Node (npm)
package-detector— Detect installed packages in a projectproject-health— Project dependency and health checker
M.Sc. in Computer Science & Engineering — University of Dhaka (Ongoing) Focus: Quantum Computing · AI/ML · Cybersecurity · Big Data Systems
B.Sc. in Computer Science & Engineering — BGC Trust University Bangladesh Graduated top 10% · Focus: Scalable Web Systems · Business Intelligence
📧 avishekdevnath@gmail.com 💼 linkedin.com/in/avishek-devnath 🌐 avishekdevnath.vercel.app 🐙 github.com/Avishekdevnath