[ Portfolio / 2026 ]Lead Product Engineer with 8+ years shipping AI-driven interfaces, SaaS platforms, and full-stack web apps.

[ Status ]Booking Q2 — Q3
Remote · Worldwide

[ Based in ]Mumbai, IN
GMT+5:30 · Working globally

Ashish Saiwal — Lead Product Engineer

Crafting thearchitecture ofintelligent products.

live

Lead Product Engineer specialized in scaling AI-driven interfaces. Bridging the gap between complex neural logic and elegant user experiences — from zero-to-launched MVPs to platforms serving 30,000+ active users.

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[ 01 / About ]

The short version.

Mumbai, IN
est. 2018

With over 8 years of hands-on experience, I've built and scaled products from zero to 30,000+ active users. My sweet spot is crafting seamless full-stack experiences — turning complex business requirements into interfaces that feel effortless. Based in Mumbai, I've shipped across fintech, real estate, edtech, and SaaS — always obsessing over performance, accessibility, and the small details that make products stick.

Years in craft: 08y+
Projects shipped: 55+
Active users scaled: 30k+
Revenue influenced: $2M+

When I'm not writing code, you'll find me exploring emerging tech, mentoring developers, or building side projects that push boundaries. Now operating as Coding Mustang — a one-person studio for product engineering.

[ 02 / Services ]

What I do for teams.

Six ways
to work together

Product Engineering

End-to-end product build — architecture, frontend, backend, infra. I own outcomes, not tickets.

AI Interfaces

LLM-powered UIs that feel native. Streaming, tools, guardrails, evals. No demo-ware.

SaaS Platforms

Multi-tenant architecture, RBAC, billing, admin, observability — the boring stuff done right.

MVP for Founders

Zero to launched in weeks. Lean scope, honest tradeoffs, code you won't throw away in round two.

React Native / Mobile

Shared-codebase apps that ship to both stores. Fast, offline-friendly, animated.

Engineering Consultation

Architecture review, hiring help, mentoring. For teams that need a sparring partner, not a vendor.

[ 03 / Selected Work ]

Things I shipped.

2023 — 2026
09 of 17 shown

Each one was owned end-to-end — architecture, frontend, backend, the uncomfortable decisions. No two were the same.

→ hover a row for preview

→ click to visit the project

→ full archive on request

01CasetLaunch site for a carry-anywhere display case built for 1:64 die-cast collectibles. Cinematic product storytelling, precision detail.Next.jsFramer Motion'26

02Lumina DesignAgency site with story-driven case studies across fintech, real estate, and edtech.Next.js'23

03PromptToVidAI content engine that turns one prompt into ready-to-post short videos with captions and upload kits.Next.jsOpenAIAI SDK'24

04WealthRightPersonal finance platform with matched expert coaches. Scaled to 30k+ clients and 750cr+ AUM.Next.jsNodePostgreSQL'25

05Jidoka TechVision-AI platform for manufacturing — real-time defect detection and assembly verification.Next.jsAI/CV'25

06RRS InternationalLuxury real estate site for a UAE developer. Hospitality-forward brand, cinematic storytelling.Next.jsSassCMS'24

07BigYellowFishAward-winning workforce well-being platform. Job-demand monitoring, reinforced learning, culture ops.Next.jsSaaS'24

08Exhibetter TechEvent management SaaS for exhibitions. Smart tech integrations, end-to-end event orchestration.Next.jsSaaS'23

09Graniti VicentiaImmersive virtual showroom where architectural finishes meet the browser. Click-through spatial UX.Next.jsWebGL'23

[ 04 / Stack ]

How I build.

Tools I reach for
without thinking

I pick boring tech on purpose. React, Next.js, Node, Postgres — then get weird where it matters: streaming LLM UIs, edge functions, unreasonably fast dashboards.

Frontend

ReactNext.jsTypeScriptTailwindFramer MotionReact Native

Backend

Node.jsPostgreSQLMongoDBRedis

AI & Tooling

LLM integrationOpenAIVercel AI SDKStreaming UIs

Infra

AWSDockerVercelEdge FunctionsCI/CD

[ 05 / Vibe Coding ]

What I'm building now.

Side projects
always shipping

Between client work, I build things for myself. These are live projects — not "coming soon" pages. Real code, real users, real lessons learned at 2am.

The Overlanding and GhostPenAI are both in active development. The terminal below reflects what's actually running on my machine right now.

Active

The Overlanding

A platform to discover and book the perfect camping spots across India — curated outdoor experiences made effortless.

Next.jsNode.jsMongoDB

progress00%

visit →

Active

GhostPenAI

An AI writing copilot for high-stakes business correspondence — pick a template, describe the goal, and ship polished cold emails, proposals, and posts in seconds.

Next.jsAI SDKOpenAI

progress00%

visit →

[ 06 / Praise ]

Words from people who paid me.

Selected
client notes

★★★★★

Ashish owns things end-to-end — from contributing to design, making a high level plan, developing, testing and finally delivering the project in production. He constantly pushes the team to deliver faster, context switches efficiently, and never hesitates to jump deep into a problem. He presents multiple ways to solve a problem, along with trade-offs — helping the team take right decisions.

Vaibhav AgarwalHead of Engineering at Stripe · Ex-Metasky, Ex-Amazon

★★★★★

With expertise in both front-end and back-end development, Ashish adeptly tackles diverse challenges with precision. As a natural team leader, he motivates his team to consistently deliver exceptional results. His commitment to continuous learning makes him an invaluable asset.

Mohamed KhalidERP and CRM Consultant, SaaS Presales GCC

★★★★★

What stood out wasn't just the technical quality — it was how little I had to manage. Ashish understood the product from day one, kept me in the loop without over-explaining, and delivered production-ready work on schedule. Exactly what you want from a dev you hire.

Santosh MishraHead IT, Exhibetter

★★★★★

I've worked with Ashish for the past two years across multiple projects, and he has always delivered great work. He has strong experience with React, Next.js, and WordPress, and has helped me build and launch several websites and apps smoothly. Ashish is reliable, quick at solving problems, and always willing to help when challenges come up.

Rohit KadamContent-Whale

★★★★★

Ashish consistently delivers clean, well-executed development work. He's dependable, detail-oriented, and great to collaborate with.

Raqshit SuvarnaMarketing Manager, Liberation Coaches

★★★★★

Working with Ashish has been a great experience for our team at Lumina. He is skilled, dependable, and always committed to delivering solid development work.

Manmeet GrewalCo-Founder, Lumina Design

[ 07 / Writing ]

Notes from the trenches.

Essays on code,
craft & scale

Feb 20, 2026Scaling AI Interfaces: Lessons from 30k+ UsersWhat I learned building and scaling AI-powered product interfaces from zero to 30,000 active users — including the architecture decisions, performance pitfalls, and UX patterns that actually worked.8 min Feb 10, 2026Why Senior Engineers Should Care About DesignThe best products are built by engineers who understand design thinking. Here's how bridging the gap between code and craft has shaped my approach to product engineering.6 min Jan 28, 2026Next.js Performance Patterns I Use in Every ProjectBattle-tested Next.js patterns for image optimization, code splitting, API route caching, and runtime performance that I apply across every client project.10 min

All posts ⟶

[ 08 / FAQ ]

Answers, upfront.

Before you
hit send

01What services do you offer?

I offer full-stack web development (Next.js, React, Node.js), AI interface & LLM integration, SaaS product development, MVP development for startups, and React Native mobile development. I work as a freelance contractor with clients globally.

02Are you available for freelance or contract work?

Yes — I'm currently available for freelance and contract engagements. I work with startups, agencies, and product teams on both short-term projects and longer-term retainers. Reach out at ashish@codingmustang.com to discuss your project.

03What is your typical project process?

I start with a discovery call to understand your goals, then deliver a scoped proposal with timeline and cost. Development follows an iterative approach with regular check-ins. I handle everything from architecture to deployment — you get a single, accountable point of contact.

04Can you build AI-powered applications?

Yes, this is a core specialty. I've built and scaled AI-powered interfaces to 30,000+ users. I integrate LLMs (OpenAI, Anthropic, custom models), build intelligent UI patterns, and architect the backend systems that make AI products fast, reliable, and cost-efficient.

05What industries have you worked in?

I've shipped products across fintech, real estate, edtech, SaaS, e-commerce, manufacturing, and health-tech. My domain flexibility means I ramp up quickly in new verticals and bring cross-industry patterns to your product.

06How do I get in touch?

Email me at ashish@codingmustang.com or fill out the contact form below. I typically respond within 24 hours. You can also find me on LinkedIn at linkedin.com/in/ashishsaiwal.

Ashish Saiwal — Lead Product Engineer

The short version.