I bridge the gap between design, engineering, and business.
I'm Sahil Mondal. I build high-fidelity software products, consult on technical roadmap strategies, and partner with early-stage founders to launch MVPs.
I began my engineering journey building basic web projects. As a self-taught engineer, I quickly realized that writing code is only 30% of the challenge. The real challenge is building the right product, solving a real problem, and making the experience friction-free.
This realization shifted my focus towards product engineering. I spent years studying user conversion flows, UX patterns, and startup operations. I didn't want to just be a coder executing tasks; I wanted to build and optimize systems.
In 2026, I founded Existify to focus entirely on helping founders validate concepts and build premium MVPs without the high overhead costs of traditional development agencies.
When I am not building client products, I design custom tools, study growth systems, and write about product engineering.
Professional Journey
- Working on Script Assist's in-house application using React, Mantine, and TypeScript.
- Contributing to a collaborative team environment.
- Implementing intuitive and responsive UIs while maintaining clean, reusable components.
- Working with product and design teams to deliver seamless features and improve user experience.
- Developing and maintaining websites and web applications using Next.js and React.
- Collaborating with cross-functional teams to create engaging and responsive user interfaces.
- Optimizing applications for maximum speed and scalability across various devices.
- Implementing UI/UX designs to ensure a smooth and intuitive user experience.
- Conceptualized and developed Vidimix, a platform aimed at simplifying content creation.
- Built the landing page, dashboard, and admin panel from scratch using Next.js.
- Implemented login functionality and integrated Stripe for payment processing.
- Managed project timelines, coordinated with a small team, and handled all aspects of the development lifecycle.
- Developed and maintained web applications using HTML, CSS, and JavaScript.
- Collaborated with design teams to create intuitive and responsive user interfaces.
- Assisted in the deployment and maintenance of web applications.
- Worked on full-stack web development projects using the MERN stack.
- Developed and integrated RESTful APIs to enhance the functionality of web applications.
- Participated in code reviews and collaborated with team members to achieve project goals.
Education
Bachelor's in Computer Applications (BCA)
KL University
Focused on software engineering and web development
Online Courses and Workshops
Various Platforms
Continuously expanding knowledge through online courses in web development, cloud computing, and software architecture.
Core Philosophies & Principles
Product-First Engineering
Write code that advances the product goals. Technical decisions must be driven by business objectives and user needs, not developers' aesthetic preferences.
Velocity Over Perfection
Launch early and iterate. Real user feedback is worth ten times more than speculative design discussions in staging environments.
Zero Overhead Partnerships
Operate with full transparency and minimal management friction. Founders get direct daily updates, quick Loom walk-throughs, and action-oriented results.
High-Fidelity Finish
Every pixel, spacing grid, and motion transition should feel premium and responsive. Design is a key driver of user trust.
Tools I Use
Certifications & Accreditations
SDE-Virtual Experience
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AWS-Cloud
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React-Basics by Meta
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Intro to Front-End Dev by Meta
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Responsive Web Design by FreeCodeCamp
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React.js Beginner
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CSS by HackerRank
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Full-Stack dev by Udemy
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UI/UX by GreatLearnings
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Freelance Mastery
Verify Credentials →Frequently Asked Questions
What exactly is a 'Product Engineer'?
A product engineer is a full-stack developer who understands design and business. Instead of waiting for a spec document, I think from the user's perspective, design matching interfaces, design backends, and focus on conversion metrics.
How do you work alongside existing design/development teams?
Under the Embedded Engineer retainer model, I join your Slack/Discord, attend weekly standups, and pull tickets from Linear. I operate as an autonomous squad member, taking ownership of full features.
Why should we hire you instead of a cheap agency?
Agencies have heavy management layers, sales teams, and slow turnaround cycles. Working with me means direct access to a developer-founder who knows how to launch fast. If you need a complete agency-led MVP, I route you through Existify.
What is your typical stack?
I specialize in Next.js, Astro, and React, on the frontend, with Tailwind CSS for layout styling. For backends, I use TypeScript (Node/bun) with Nest.js or Hono framework, PostgreSQL or Supabase for databases, and Redis for caching. For hosting, I use Vercel, AWS or VPS