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OPEN TO UK RELOCATION · TIER 2 ELIGIBLE

Senior Full Stack Engineer · SaaS Architect · Product Builder

Building Products That Scale.

I design and ship SaaS systems for founders and product teams — architecture, performance, and delivery that hold up under real users, real traffic, and real business constraints.

Next.js · React · TypeScript · Node.js · NestJS · AI · Cloud

Professional portrait of Sagar Tank, Senior Full Stack Engineer
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Years Experience

Shipping production software across SaaS and enterprise

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Delivery Cycles Shipped

Client and product work across SaaS, enterprise, and open source

High-volume

Production API Traffic

Multi-tenant systems under real traffic — not a single lab benchmark

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SaaS Products Built

Products with billing, tenancy, and real users

Uptime-first

Reliability Practice

Designed for observability, caching, and recovery — not a published SLA

Proven experience at scale

Teams and platforms where I shipped production software under real delivery pressure.

Dubai Technologies

Nityo Infotech

Benthonlabs

Colaborarlabs

Prolix Technikos

Troth Labs

Skywork Technology

Products

Products & Platforms

Shipped production systems and products I'm building next — each treated with serious architecture, UX, and delivery ownership.

View all products(+4)
TTS Talent logoProductionvia Prolix Technikos(Troth Labs)

TTS Talent

Talent assessment platform — Report module in production

Built the Report module end to end for TTS Talent during my time at Prolix Technikos — a production reporting experience for talent assessment and decision workflows, delivered with React.js and Vue.js. TTS helps organisations make better talent decisions through contextual, flexible, and integrated assessment solutions.

  • React.js
  • Vue.js
  • JavaScript
  • Node.js
  • CSS3
TTS Talent talent assessment and reporting platform
Credello logoProductionvia Benthonlabs

Credello

Credit card decision engine — guided recommendations in production

Built the guided recommendation experience that helps users find the best credit card based on a short questionnaire and real spending patterns — turning messy product catalogs into clear, tailored decisions. Shipped at Benthonlabs for Credello, a fintech platform focused on unbiased, actionable financial product matching under high-traffic conditions.

  • React
  • Next.js
  • TypeScript
  • Node.js
  • SEO
Credello credit card recommendation and decision experience

Selected work

Engineering Case Studies

Stories about constraints, architecture, and outcomes — the kind of work that proves systems thinking, not just feature delivery.

Government logistics operations dashboard

Government

UAE Government Transport Platform

Real-time logistics and regulatory operations at national scale

Problem
Fragmented portals, weak accessibility posture, and slow operational dashboards made fleet regulation harder for operators and agencies.
Architecture
React micro-frontends with shared UI contracts and WebSocket-backed monitoring surfaces.
Challenges
High-frequency map and dashboard updates without locking the interface.
Solution
Windowed updates, selective rendering, and a centralised component system.
Business Impact
Reliable operator workflows for regulated transport operations.
Performance Gain
Stabilised live operational views under frequent telemetry updates.
Lessons Learned
Shared design systems beat one-off government UI modules when multiple agencies ship in parallel.
  • React
  • TypeScript
  • WebSockets
  • Maps/GIS
  • Micro-frontends
  • WCAG 2.1

    Accessibility target

  • UAE Government

    Domain

Composites One enterprise catalogue experience

Enterprise

Composites One Enterprise Platform

Live industrial product discovery for North America's leading composites distributor

Problem
Industrial buyers needed fast, trustworthy product discovery and technical content across a massive catalogue — without the site collapsing under complex CMS-driven pages or heavy list rendering.
Architecture
Next.js + Contentful composition with memoised catalogue rendering and modular content contracts.
Challenges
Large industrial datasets, SEO-sensitive discovery pages, and multi-market content needs.
Solution
State slicing, memoisation, reusable CMS page modules, and clear frontend ownership boundaries.
Business Impact
Live product discovery and content operations for a North American materials distributor serving 50,000+ products.
Performance Gain
~35% fewer redundant re-renders on heavy industrial catalogue views.
Lessons Learned
Enterprise catalogues fail from render cost and content chaos long before they fail from traffic — architecture and CMS contracts are the product.
  • Next.js
  • React
  • Contentful
  • TypeScript
  • Redux
  • ~35%

    Render efficiency

  • 50,000+ SKUs

    Catalogue scale

  • Live

    Status

Impact

Business Impact

Outcomes that matter to founders and hiring managers: speed, leverage, reliability, and systems that keep shipping.

Performance that converts

Faster APIs and stronger Core Web Vitals that improve activation, retention, and perceived product quality.

Architecture that grows

Multi-tenant foundations, clear boundaries, and caching strategies that survive the jump from MVP to scale.

Systems with ownership

End-to-end technical decisions across product surfaces, APIs, and operational readiness — not just UI tickets.

Cloud with discipline

AWS and serverless delivery with observability, cost awareness, and boundaries teams can actually maintain.

AI with guardrails

Practical automation that reduces repetitive work without turning your product into an unreliable novelty.

Delivery leverage

Design systems, mentoring, and CI-friendly patterns that raise the median quality of the entire team.

Philosophy

My Engineering Principles

A short operating system for building software that stays understandable, fast, and safe as the product grows.

Performance First

Speed is a feature. Rendering strategy, caching, and query discipline are product decisions — not cleanup work.

Developer Experience

Clear boundaries, typed contracts, and boring conventions make teams faster than clever abstractions ever will.

Simple > Clever

Prefer systems a new engineer can understand on day two. Cleverness that cannot be operated is debt.

Scalable Architecture

Design for tenancy, isolation, and growth paths early enough that scale does not require a rewrite.

Security by Default

Authz at the boundary, least privilege in the design, and no accidental trust in client-provided state.

Automation Everywhere

If a process is repeated, automate the boring parts so humans can focus on judgment and craft.

Working together

Why Work With Me

Less resume language. More signal about how I think, decide, and ship when the stakes are real.

I architect products — not just features.

I care about the whole system: journeys, data boundaries, failure modes, and how the product behaves six months later.

I optimize systems — not just code.

Latency, caching, rendering strategy, and operability. The goal is a product that feels fast under load.

I think like a founder — not only an engineer.

Scope, sequencing, and trade-offs are product decisions. I help teams ship the highest-leverage path.

I solve business problems with software.

Clean architecture matters because it protects velocity, reliability, and the team's ability to keep shipping.

Modern engineering workspace with dual monitors

Timeline

Professional Experience

A product timeline of roles — focused on achievements and business impact, not LinkedIn-shaped employment dumps.

  1. Jul 2022

    Senior Software Engineer

    Dubai Technologies · Nityo InfotechRemote

    Led delivery on multi-tenant SaaS and a UAE government platform — performance, architecture, accessibility, and AI automation owned as measurable outcomes.

    • Reduced API response times by ~30% by redesigning data-fetching architecture and implementing strategic caching — cutting server costs and improving retention.
    • Raised Lighthouse performance scores by 25+ points through code-splitting, lazy loading, and SSR/ISR in Next.js, improving SEO rankings.
    • Architected and delivered a micro-frontend system with WCAG 2.1 AA compliance for a UAE government transport platform serving enterprise-scale concurrent users.
    • Integrated OpenAI API-powered workflows that automated 3 previously manual processes, saving an estimated 15+ engineering hours per sprint.
    • Introduced GraphQL subscriptions alongside TypeScript strict mode, reducing type-related runtime errors to near-zero across a 50,000+ line codebase.

    Business impact: Faster APIs, stronger SEO-facing performance, and compliant government delivery at enterprise scale.

    • Next.js
    • React
    • TypeScript
    • Nest.js
    • GraphQL
    • OpenAI API
    • WCAG 2.1
  2. Feb 2022 – Jul 2022

    Senior Software Engineer

    Colaborarlabs / BenthonlabsRemote

    Raised frontend quality and handled traffic growth on a high-concurrency React/Node.js application.

    • Cut frontend bug count 25% in 6 months by enforcing component-level unit testing with React Testing Library and establishing a PR review checklist.
    • Scaled a high-traffic React/Node.js application to handle a 3× spike in concurrent users without infrastructure changes, through strategic memoization and query batching.
    • Built Credello's guided credit card recommendation module — questionnaire + spending signals that help users choose the best card with clear, decision-ready outcomes in production.

    Business impact: Fewer production defects, stable performance under a threefold concurrency spike, and a shipped decision journey for high-traffic fintech acquisition.

    • React
    • Node.js
    • TypeScript
    • Jest
    • React Testing Library
  3. Jan 2017 – Jan 2022

    Senior Software Engineer

    Prolix TechnikosIndia

    Built and launched multiple production SaaS products across healthcare and e-commerce, including RBAC systems and APIs consumed by mobile and third-party clients.

    • Built RBAC systems with role hierarchy (platform → company → user) across healthcare and e-commerce SaaS products serving thousands of daily active users.
    • Delivered 5+ large-scale production applications from architecture to launch, establishing reusable component libraries that cut average feature delivery time by ~20%.
    • Designed and documented REST and GraphQL APIs consumed by mobile and third-party clients, achieving 99.9% uptime over a 3-year period.
    • Built the TTS Talent Report module end to end with React.js and Vue.js — shipped to production for a global talent assessment platform.
    • Delivered PowWowNow Home CRM surfaces for managing online meetings — video calls, webinars, and conference workflows for a UK communications platform.

    Business impact: Multi-product delivery with durable RBAC, reusable UI systems, and long-term API reliability.

    • React
    • Nest.js
    • ExpressJs
    • REST
    • GraphQL
    • Prisma
    • PostgreSQL
    • MongoDB
    • RBAC
  4. Jan 2016 – Dec 2016

    Junior Web Developer → Intermediate Web Developer

    Skywork TechnologyRajkot, Gujarat, India

    Started as a Junior Web Developer and grew into an Intermediate Web Developer role, building full-stack web applications across frontend and Node.js backends for client projects in Rajkot.

    • Began as a Junior Web Developer owning UI implementation, page layouts, and responsive styling with HTML, CSS, and CSS3 across client websites and web apps.
    • Progressed to Intermediate Web Developer responsibilities spanning feature development, bug fixing, and delivery support across active product workstreams.
    • Built interactive frontend experiences with AngularJS and React.js, translating designs into usable, maintainable interfaces.
    • Developed Node.js server-side features and API integrations for application workflows and data handling.
    • Strengthened CSS/CSS3 foundations for responsive layouts, cross-browser consistency, and reusable UI styling patterns.

    Business impact: Established the full-stack foundation later used across senior roles — shipping client work while progressing from junior to intermediate delivery ownership.

    • Node.js
    • AngularJS
    • React.js
    • JavaScript
    • HTML
    • CSS
    • CSS3

Public work

Open Source

Public work, experiments, and reusable engineering that compounds beyond a single product.

View GitHub

Public

GitHub Profile

Electron

Desktop App

SaaS

Primary Focus

TS

Language Home

Writing

Technical Insights

Notes on scaling SaaS, Next.js systems, architecture, cloud, and the habits that keep teams productive.

View all articles

TRUST

Built through real products, real teams, and measurable outcomes.

My experience comes from delivering production software for enterprise clients, SaaS products, and government platforms—not from personal demos or tutorial projects.

Enterprise Delivery

Delivered production software for enterprise organizations and government-backed initiatives using React, Next.js, Node.js, and modern cloud architecture.

Enterprise Scale

Product Ownership

Designed and shipped SaaS products from architecture to deployment, focusing on scalability, performance, security, and maintainability.

End-to-End Delivery

Engineering Impact

Improved application performance, API response times, developer productivity, accessibility, and long-term maintainability across multiple production systems.

Business Outcomes

Let’s talk

Recruiters and CTOs: share the role, team context, or problem space. I reply to serious UK and remote opportunities.

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Let's Build Something People Love.

Whether you're building your first SaaS or scaling an existing platform, I'd love to help design, architect, and ship products that users enjoy — and systems your team can operate with confidence.