Senior software engineerLead architect

Senior software engineer for complex product systems.

I help teams build, stabilize, and scale web, mobile, API, and platform products across messy real-world domains.

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8+ years production engineering

100+ web and mobile products delivered across client work

+8,000 users reported after Museum Advocate development

6,000+ salon listings supported in Serve Me marketplace

I’m strongest when the work needs both engineering depth and product judgment.

I can step into senior engineer, lead engineer, architect, frontend, backend, or full-stack roles where the product has real constraints: schedules, permissions, integrations, data ownership, legacy systems, mobile workflows, and production reliability.

Product architecture Frontend and mobile apps Backend and API systems Technical leadership Integrations and data flows Production reliability

Featured case studies

Two deeper examples of how I move products from fragile ideas or inherited systems into working platforms.

01 / Museum Advocate

Evolving an inherited art app into a museum-owned platform.

An Airtable/Firebase-backed mobile app became a three-product ecosystem: Museum Advocate for museums, ArtScene for public discovery, and AI Cataloging for mobile artwork capture.

Next.js React Native Node.js MongoDB Firebase Storage

Problem: The client team was still acting as the data-entry layer for museums, maintaining catalog data manually.
Owned: Solution architecture, API/data model direction, team delivery, migration work, integrations, deployment, and support.
Outcome: Museums could manage first-party collection data while the mobile apps moved onto a shared platform layer.

+8,000users reported by the client
5K+public Google Play downloads for ArtScene
3 appsdashboard, consumer app, and AI Cataloging connected through one ecosystem

Verified Clutch review

Museum Advocate dashboard screenshot — Museum dashboard

Museum Advocate dashboard overview screenshot — Collection overview

Museum Advocate patrons dashboard screenshot — Patron insights

Museum Advocate settings screenshot — Cataloging settings

Museum Advocate admin center screenshot — Admin center

02 / Serve Me

A booking marketplace that understood real salon operations.

Serve Me replaced a WordPress direction with a custom salon platform where availability came from real staffing, service, location, inventory, and accounting rules.

NestJS PostgreSQL PostGIS Redis Visma e-conomic

Problem: Salon booking could not be modeled as simple opening hours or fixed slots.
Owned: Architecture and most backend functionality, with frontend delivery led through the wider team.
Outcome: A marketplace and salon-operations platform validated through a closed pilot with real businesses.

6,000+salon listings supported with PostGIS location search
20-30salon pilot across booking, employees, and inventory workflows
Rules engineshifts, breaks, leave, existing bookings, service eligibility, and duration

Verified Clutch review

Serve Me appointment calendar screenshot — Appointment calendar

Serve Me map based salon discovery screenshot — Marketplace map

Serve Me employee management screenshot — Employee setup

Serve Me inventory product list screenshot — Inventory

Serve Me edit appointment screenshot — Booking edits

oto.work

Automated freelance management SaaS with invoicing, payments, contracts, reminders, and LLM proposal generation.

Clean energy infrastructure

Client-side data flows, REST/GraphQL API shaping, and maintenance portals for a clean energy infrastructure company.

Taskemia wellness suite

MoneyInThePot, Camelot, and Habits Made Fun: web and mobile products for fitness, wellness, and peer self-improvement.

MoneyInThePot Camelot Habits Made Fun

delivery loop

01 Model the domain
Find the hidden rules first: who owns data, what changes state, and where off-the-shelf assumptions break.
02 Build the operational spine
APIs, schemas, permissions, queues, integrations, and deployment paths that can survive real usage.
03 Keep delivery legible
Small sprint decisions, honest technical tradeoffs, code review, and enough documentation for the team to move.
04 Harden after launch
Reliability, security scanning, indexing, payload shape, and architecture adjustments once production starts teaching.

engineering profile

Senior software engineer, technical lead, and architect.

I build web, mobile, API, and platform systems, lead delivery, model complex domains, and collaborate across product, frontend, backend, and infrastructure. Recent work includes clean energy infrastructure portals and long-running client platforms. Strongest stack: Node.js, TypeScript, Express/NestJS, MongoDB, PostgreSQL, React, Next.js, and React Native.

tehseen.siddiq@gmail.com

Proof from people.

Verified client feedback and direct testimonials, followed by separate product outcome signals.

“Tehseen has been crucial in developing several different app/web solutions for my company. He is great at communication... 6 out of 5 stars from me!”
René N. / Founder client review

“Tehseen really cares about your product... getting another project member into the group.”
Serve Me verified Clutch review

“They were critical in building our software... honest, hardworking, and reliable.”
Taskemia Inc. verified Clutch review

“The company has grown with us, and it has been a pleasure to work with this team.”
Museum Advocate verified Clutch review

Serve Me review Museum Advocate review Taskemia review

Product outcomes

+8,000users reported by Museum Advocate client

5K+public Google Play downloads for ArtScene

6,000+salon listings handled in Serve Me marketplace

Have a product with messy rules?

I’m useful when the system has to model reality, not just render screens.

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