Purushottam
Kunwar
Senior Backend Engineer
I design and ship high-impact backend systems that scale to millions — across fintech, govtech, maritime, and logistics.
Featured Work
Projects
Enterprise-grade systems I designed and shipped.
Enterprise SSO Gateway
2024 – PresentFederated Identity & Access Platform
FleetPro
2023Real-Time Logistics Fleet Management
PIMS
2021 – 2022Government Pension Information System
Yacht Cloud
2022 – 2023Maritime Fleet Management Platform
NEMCCU
2019 – 2020Credit Union Accounting System
Listen on Repeat
2020Music Streaming Platform
Deep Dives
Case Studies
How I solved the hard problems.
Security / Enterprise
2024 – Present
Enterprise SSO Gateway
Enterprise clients needed to authenticate their employees into client apps using their existing identity providers (Active Directory, Okta, Google Workspace) — but each integration was being built separately, creating maintenance sprawl.
Key Decision
Built a SAML→JWT protocol bridge so every client app speaks one auth standard regardless of IdP. Redis enforces sub-100ms token rotation across 100K+ monthly events. Blue/green deployment preserves sessions during cutover — zero downtime.
Impact
- →15+ enterprise clients onboarded with zero auth downtime
- →SAML ↔ OAuth protocol bridge handling 100K+ auth events/month
- →IdP onboarding time reduced from 2 weeks of engineering to 2 hours of config
Logistics / IoT
2023
FleetPro
A logistics company with 200+ vehicles had zero real-time visibility — dispatch called drivers individually, fuel consumption was untracked, and route optimization was guesswork.
Key Decision
Laravel Reverb WebSocket server holds 200+ persistent GPS device connections on a single process. Queue workers batch-write telemetry to prevent write contention at 50K+ records/day. Mapbox GL delivers sub-5s live position updates to dispatch dashboards.
Impact
- →40% reduction in fuel costs through route optimization insights
- →Real-time tracking of 200+ vehicles with sub-5 second update latency
- →50K+ GPS records ingested daily with no data loss
GovTech / Enterprise
2021 – 2022
PIMS
A government ministry was processing pension disbursements for 10,000+ retirees manually — paper forms, offline spreadsheets, no audit trail, and monthly errors in payment calculations.
Key Decision
FastAPI microservices split by lifecycle domain — enrollment, calculation, disbursement — each with its own audit trail. A custom rule engine handles tier multipliers and benefit brackets without redeployment. Column-level AES-256 encryption satisfies government compliance.
Impact
- →70% reduction in monthly processing time — from 3 weeks to under 4 days
- →10,000+ pensioner records digitized and migrated from paper
- →Zero payment errors post-launch vs. monthly corrections previously
Experience
6 years of production engineering
From junior developer to senior backend engineer.
Senior Backend Engineer
- ▸Enterprise identity protocols
- ▸Protocol translation bridge
- ▸Team technical leadership
Senior Backend Engineer
- ▸Real-time GPS WebSocket
- ▸Auto-scaling SaaS
- ▸Multi-brand platform architecture
Senior Backend Engineer
- ▸First senior role
- ▸Elasticsearch at scale
- ▸10TB+ media infrastructure
Backend Engineer
- ▸Government-grade security
- ▸FastAPI microservices
- ▸Legacy data migration at scale
Software Engineer
- ▸First AWS production deployment
- ▸WebRTC real-time collaboration
- ▸SCORM compliance implementation
Junior Software Developer
- ▸Built first production system
- ▸Multi-tenant PostgreSQL architecture
- ▸Financial domain expertise
Stack
Tech Stack
Technologies I use in production — no skill bars, no percentages.
Backend
Databases
Cloud & DevOps
APIs & Protocols
Frontend
Contact
Let's build
something.
Open to senior backend engineering roles, architecture consulting, and interesting distributed systems problems.