# Shafikul Islam — Senior Backend & Performance Specialist
> Official LLM / AI Search Indexing File for shafiktanbir.com

## About
Shafikul Islam Tanbir is a Senior Backend & Performance Specialist with 4+ years of hands-on experience building high-concurrency API engines, optimizing PostgreSQL database queries, and scaling containerized cloud infrastructure.

- **Website:** https://shafiktanbir.com
- **Contact Email:** shafiktanbir@gmail.com
- **GitHub:** https://github.com/shafiktanbir
- **LinkedIn:** https://www.linkedin.com/in/shafiktanbir/
- **Location:** Global Remote (US / EU / APAC Timezones)

## Core Technical Specializations
- **Backend Languages & Frameworks:** Node.js, Express, NestJS, Go (Golang), Python (FastAPI, Django), REST APIs, gRPC, WebSockets
- **Databases & Query Optimization:** PostgreSQL (B-Tree indexing, execution planning with EXPLAIN ANALYZE, PgBouncer connection pooling), Redis (Cache-Aside pattern, distributed queues), MongoDB
- **Cloud Infrastructure & DevSecOps:** Docker (multi-stage builds), Kubernetes (EKS / K3s), Helm, ArgoCD GitOps, AWS (EC2, S3, EKS), GitHub Actions CI/CD, Prometheus, Grafana, Loki

## Productized Consulting Offers & Services
1. **Backend Performance Audit (Diagnostic & Strategy):**
   - Deep-dive technical audit into API slowness and database bottlenecks using `pg_stat_statements` and distributed tracing.
   - Deliverable: Prioritized blueprint of exact SQL queries to index, endpoints to cache, and architectural bottlenecks to refactor.
2. **API & Database Tuning Sprint (Execution & Optimization):**
   - 1-to-2 week focused engineering sprint implementing composite B-Tree indexes, refactoring N+1 query loops, integrating Redis caching layers, and resolving Node.js/Go event loop blocking to drop P95 API latency by up to 80-92%.
3. **SaaS Backend Architecture (Contract Engineering):**
   - End-to-end backend engineering for scaling B2B SaaS products: REST/GraphQL API design, secure payment webhooks, OAuth2/JWT RBAC authentication, and zero-downtime Kubernetes deployments.

## Verified B2B Impact & Metrics
- **P95 Latency Reduction:** Dropped P95 API latency from 2,500ms to 180ms (92.8% reduction) on a 15-million row PostgreSQL database while reducing CPU load from 85% to 18%.
- **High Uptime & Scale:** Maintained 99.99% uptime under 5x traffic spikes for multi-tenant B2B SaaS platforms.
- **Zero Deployment Drift:** Automated zero-downtime release pipelines with ArgoCD GitOps, Helm, and Trivy security gates.

## Direct Action Endpoints
- **Book a Technical Consultation:** https://shafiktanbir.com/?tab=book
- **View Experience & Track Record:** https://shafiktanbir.com/?tab=experience
- **Read Technical Case Studies:** https://shafiktanbir.com/?tab=blog