Senior Software Engineer

Sudipta
Mondal

Full-Stack Architect
& Systems Builder

Eight years designing and shipping SaaS platforms that scale — from first commit to 100k+ concurrent users. I architect the entire stack so founders can focus on their product.

View Work →Services↓ Resume
8+
Years of Engineering
12+
Products Shipped
100k
Concurrent Users Served
5★
Client Satisfaction
“Sudipta delivered a complete SaaS platform on time and beyond expectations — truly a senior-level engineer who thinks like a product owner.”— James K., Founder · TaskGrid
01 — What I Offer

Services &
Packages

End-to-end engineering, infrastructure & technical leadership
01 / SERVICE
SaaS
Full-Stack SaaS Build
End-to-end SaaS product development — from architecture to deployment. I handle every layer so you can focus on the product.
Nuxt.js / Vue.js / React frontend
NestJS / Node.js backend APIs
Multi-tenant database architecture
AWS infrastructure + CI/CD
Auth, billing (Stripe), notifications
Starting from discovery call
02 / SERVICE
API
Backend API & Systems
High-performance, scalable backend systems. REST or GraphQL. Optimized for throughput, reliability, and maintainability.
REST / GraphQL API design & build
Real-time with Socket.io / WebRTC
Database design & optimization
Microservices & event-driven arch
Redis caching, queues, pub/sub
Fixed scope or retainer
03 / SERVICE
Ops
DevOps & Cloud Setup
Production-grade cloud infrastructure. Automated deployments, zero-downtime, observability. Built for teams that ship fast.
AWS architecture design
Docker / Kubernetes orchestration
Terraform infrastructure as code
CI/CD pipelines (GitHub Actions)
Monitoring, logging, alerting
One-time or ongoing
04 / SERVICE
Int.
Integrations & Automation
Connect your stack. Automate your ops. From Shopify to Stripe to custom AI pipelines — I wire it all together.
Shopify / eCommerce integrations
Payment gateway implementations
n8n / Zapier automation flows
AI agent workflow development
Third-party API integrations
Per project
05 / SERVICE
Perf
Performance Audit & Fix
Slow app? I diagnose and fix. LCP, TTFB, database N+1s, memory leaks — I find the bottleneck and eliminate it.
Core Web Vitals audit & fixes
SSR / SSG optimization
Database query optimization
CDN, caching layer setup
Load testing & profiling
Audit starts at fixed price
06 / SERVICE
CTO
Fractional CTO
Technical leadership for startups without a full-time CTO. I align engineering with product vision and keep the team shipping.
Architecture decision-making
Technical hiring & code review
Roadmap & sprint planning
Vendor & tooling evaluation
Investor technical due diligence
Monthly retainer
02 — Selected Work

Project
Portfolio

08 shipped products across SaaS, EdTech, eCommerce & Enterprise
TaskGrid
▶
01 — Featured
TaskGrid
All-in-one project & task management SaaS — boards, real-time collaboration, analytics, automation, team communication. Scaled to 100k+ concurrent users.
Nuxt.jsNestJSMongoDBPostgreSQLRedisSocket.ioAWS
BoostUGC
▶
02
BoostUGC
Video testimonial platform. Multi-brand agency management, secure storage, moderation at scale.
Nuxt.jsNestJSWebRTCAWS
Pengine
▶
03
Pengine
Next-gen print-on-demand SaaS. Shopify integration, bulk mockup generation, wallets, enterprise APIs.
Nuxt.jsNestJSClickHouseShopify
Render Engine
▶
04
Render Engine
GPU-powered SaaS generating ultra-realistic product mockups at scale. Eliminated manual bulk workflows.
Nuxt.jsGPU RenderGraphQLAWS
Craft Music
▶
05 — Featured
Craft Music
Real-time global music lesson platform. Audio-optimized WebRTC, timezone-aware scheduling, live chat, subscriptions & payments worldwide.
Nuxt.jsNestJSWebRTCGetStreamDockerAWS
Egshop.io
▶
06
Egshop.io
Multi-tenant eCommerce SaaS for Bangladeshi merchants. Local payments, logistics, multi-store management.
Node.jsMongoDBRedisDocker
Eselfmade
▶
07
Eselfmade
EdTech SaaS — course discovery, automated payments, progress tracking, centralized admin ops.
Nuxt.jsNode.jsPostgreSQLAWS
Forecasting — ACI
▶
08
Forecasting — ACI
Enterprise automation replacing Excel. Multi-year production & budget analytics with real-time dashboards.
React.jsPythonFastAPIPostgreSQL
03 — Testimonials

What Clients
Say

Six verified reviews from Upwork, LinkedIn & direct clients
UPWORK
★★★★★
Sudipta delivered a complete SaaS platform on time and beyond expectations. The architecture was clean, scalable, and well-documented. Truly a senior-level engineer who thinks like a product owner.
JK
James K.
Founder · TaskGrid
DIRECT
★★★★★
The WebRTC implementation for our music platform was flawless. Sub-100ms latency globally, zero audio artefacts. He handled the entire infrastructure from scratch. Highly recommend for real-time systems.
SM
Sarah M.
CTO · Craft Music
LINKEDIN
★★★★★
Replaced our entire Excel forecasting workflow with a robust system in 8 weeks. The dashboard is intuitive and the automation saves our team 20+ hours a week. Exceptional problem-solver.
RA
Rahman A.
VP Operations · ACI Group
UPWORK
★★★★★
Outstanding Shopify app development. Deep API knowledge, clean code, deployed to production without a single issue. Responded quickly and adapted to our changing requirements throughout.
TW
Tom W.
Co-Founder · eCommerce Brand
DIRECT
★★★★★
Sudipta rebuilt our backend from a monolith to microservices in a way that caused zero downtime. Our system now handles 10x the load with the same infrastructure costs. Remarkable engineering.
NI
Nadia I.
CEO · Egshop.io
LINKEDIN
★★★★★
As our Fractional CTO, Sudipta helped us go from MVP to Series A in 9 months. He made smart architectural decisions early that saved us enormous refactor costs down the line. A rare find.
MH
Mark H.
Founder · B2B SaaS Startup
04 — Career History

Experience
Log

8 years across SaaS, enterprise & startup environments
22–
2022–26
Current
Lead Systems Architect
Egshop.io · Pengine · BoostUGC · Render Engine
Designed and delivered 5+ multi-tenant SaaS platforms from 0→1, handling 100k+ concurrent users
Reduced 12% LCP on flagship product via SSR micro-optimizations and CDN architecture
Built GPU-accelerated mockup generation pipeline processing millions of assets per month
Led distributed teams of 6–12 engineers across product, platform, and DevOps streams
19–
2019–22 · 3 yrs
Senior Backend Engineer
TaskGrid · Craft Music · Eselfmade
Architected real-time collaboration engine using Socket.io + Redis Pub/Sub for 100k+ users
Built WebRTC audio-optimized lesson platform with sub-100ms latency globally
Automated n8n/Zapier workflows cutting manual ops by 70% across 3 platforms
16–
2016–19 · 3 yrs
Full-Stack Developer
Campus Automation · ACI Group · Shopify Apps
Built campus management system digitizing admissions, exams, payroll for 5000+ users
Replaced Excel-based enterprise forecasting with real-time FastAPI + React dashboards
Shipped 3 Shopify apps — product grouping, collection duplicator, memberships
05 — Tech Capabilities

Architecture
Stack

Full stack depth from component to cluster

Full stack with depth in frontend performance, distributed backend systems, and cloud infrastructure.

Every layer chosen for scalability — from the component to the cluster.

Frontend96%
Backend94%
DevOps88%
Rx
React.js TypeScript
Nx
Nuxt.js Vue 3
Ns
NestJS Node.js
Py
Python FastAPI
Pg
PostgreSQL MongoDB
Rd
Redis ClickHouse
Aw
AWS Docker
Tf
Terraform CI/CD
Rt
Socket.io WebRTC
Sh
Shopify API
n8
n8n Zapier
Gq
GraphQL REST
06 — Get In Touch

Ready to
Deploy?

Available for senior roles, SaaS builds & Fractional CTO

Let's build
something
that scales.

Available for senior engineering roles, SaaS builds, DevOps setups, and Fractional CTO engagements. Let's architect something that lasts.