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Founding Full Stack Engineer
Founding Full Stack Engineer

Founding Full Stack Engineer at ProofofSkill · Remote only · 2 - 5 years · ₹4L - ₹7L / yr (ESOP available) · Raised funding · Remote only · Posted 13 Oct 2026

ProofofSkill's logo

Founding Full Stack Engineer

Atharva K's profile picture
Posted by Atharva K
2 - 5 yrs
₹4L - ₹7L / yr (ESOP available)
Remote only
Skills
skill iconReact.js
TypeScript
skill iconNextJs (Next.js)
frontend
backend
Software Testing (QA)
Database Design
Software architecture
Systems architecture
Artificial Intelligence (AI)
skill iconMachine Learning (ML)
Product Management
Prototyping

We’re reimagining how users interact with SaaS products and looking for a founding engineer to help build the first version from zero alongside a founder with experience building at HubSpot, Asana, and Datadog.



Role

We are hiring a Founding Engineer with strong frontend, product, and design instincts. You will work directly with the founder to shape the product, prototype quickly, make architecture decisions, think through user problems, and turn an early thesis into a working product.

The ideal person is a builder — someone who can move from an ambiguous idea to prototype, from prototype to usable product, and from usable product to scalable architecture. You should be excited by the opportunity to change how users interact with software and, eventually, the internet itself.

What You’ll Build

You will help build the first version of our core product, including:

  • An SDK powered by frontier AI models and modern product experience protocols
  • Backend services with rules, resolution logic and intent inference
  • Early prototypes that help us test different wedges with customers
  • Production-ready systems as the product direction becomes clearer

This role will likely span React, TypeScript, Next.js, backend APIs, databases, event tracking, and AI-assisted workflows.

Required Experience

  • 2–5 years of software engineering experience, or equivalent demonstrated ability
  • Strong frontend engineering experience with React and TypeScript
  • Ability to design clean, scalable frontend component architecture
  • Experience with backend APIs and databases
  • Experience taking ambiguous product ideas and turning them into working software

Strong Plus

  • Experience building 0-to-1 products
  • Experience at an early-stage startup
  • Experience building SaaS products

What Success Looks Like

In the first 30 days, you will:

  • Understand our thesis, target customer, and product direction
  • Help refine the first product wedge
  • Build and iterate on early prototypes
  • Set up core frontend and backend foundations
  • Move quickly across product, design, and engineering decisions

In the first 60–90 days, you will:

  • Ship the first usable product prototype
  • Help build demo experiences that clearly communicate the product vision
  • Create the first version of the adaptive frontend architecture
  • Help test the product with early users, customers, or design partners
  • Identify what should become production-grade versus what should remain experimental

Leadership Opportunity

This is a founding role with significant upside.

For the right person, strong performance can lead to a leadership position as the company grows. We are looking for someone who can become a long-term technical and product partner — someone who can help build the first version, shape the architecture, hire future engineers, and potentially lead major parts of the engineering organization.

This is an opportunity to join at the earliest stage and help define both the product and the company.

Why Join

  • Build from zero with high ownership
  • Work directly with the founder
  • Help create a new category of software
  • Own meaningful technical decisions from day one
  • Opportunity to join the leadership team as the company scales


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Shubham Vishwakarma's profile image

Shubham Vishwakarma

Full Stack Developer - Averlon
I had an amazing experience. It was a delight getting interviewed via Cutshort. The entire end to end process was amazing. I would like to mention Reshika, she was just amazing wrt guiding me through the process. Thank you team.
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About ProofofSkill

Founded :
2024
Type :
Product
Size :
0-20
Stage :
Raised funding

About

N/A

Company social profiles

linkedin

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📌Important: To complete your application for this role, please fill out this short screening form: [https://app.botfriday.ai/#/open/external-job-application/792cccfa-c046-4092-b20d-814705d5314f].


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Cognizant is one of the world's leading professional services companies, transforming clients' business, operating, and technology models for the digital era. Our unique industry-based, consultative approach helps clients envision, build, and run more innovative and efficient businesses. Headquartered in the U.S., Cognizant (a member of the NASDAQ-100 and one of Forbes World's Best Employers 2025) is consistently listed among the most admired companies in the world. 

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Your day-to-day responsibilities: 

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  • Work on a well-architected, fast-evolving TypeScript codebase using technologies such as React, Node.js, Electron, and GraphQL 
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You will know you're successful if: 

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What makes you a great fit 

Must-haves: 

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  • Strong proficiency with TypeScript across frontend and backend, including building and maintaining Node.js-based services 
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Nice-to-haves: 

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Frontend

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Frontend

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  • Git, PR workflows, and code review habits
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  • Multi-tenant SaaS, payments (Stripe/Razorpay), or real-time features
  • Open-source contributions, a side project, or shipped AI features you can demo

What We Expect From You

  • Ownership: take a feature from schema to UI to production, and flag risks early
  • Judgment over speed: AI makes you faster, and you're still accountable for every line you ship
  • Security awareness: no secrets in prompts, no blind copy-paste of AI code, and sensitive data stays out of third-party tools
  • Systems thinking: consider scale, failure modes, and cost, not just the happy path
  • Learning speed: the AI tooling landscape changes every few months, and you keep up and share what works
  • Clear communication: PRs, docs, and async updates that others can follow


If interested for this job pls contact us on this WhatsApp number, nine three one six one two zero one three two

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We are now looking for a senior engineer who can take ownership of the existing codebase and help take it from AI-assisted development into a robust, production-ready SaaS product.


What you'll be doing

  • Take ownership of an existing Next.js + TypeScript codebase.
  • Understand the existing architecture, database structure, APIs and application flows.
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  • Build and maintain production-quality frontend and backend features.
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  • Build reliable automation and workflow functionality.
  • Implement proper authentication, authorization, data isolation, logging, monitoring and error handling.
  • Help establish engineering standards, testing and deployment practices.
  • Eventually build and lead the engineering team as X.re scales.


What we're looking for

We are looking for someone who has strong engineering judgment, not someone who simply knows a list of technologies.


You should be able to:

  • Enter an unfamiliar codebase and understand it quickly.
  • Identify what is well designed and what is technically risky.
  • Take an MVP and turn it into production-grade software.
  • Make pragmatic architectural decisions.
  • Think about security, scalability, reliability and maintainability.
  • Work independently and take ownership.
  • Read and review code generated or assisted by AI.
  • Know when AI-generated code is acceptable and when it needs to be redesigned.
  • Build rather than just manage developers.


Technical requirements

Strong experience with:

  • TypeScript
  • Next.js / React
  • Node.js
  • REST APIs
  • PostgreSQL / SQL
  • Modern SaaS application architecture
  • Cloud deployment
  • Git and production development workflows


Experience with the following is a strong advantage:

  • AI/LLM applications
  • WhatsApp Business API
  • Webhooks
  • Multi-tenant SaaS
  • API integrations
  • Docker
  • AWS or similar cloud platforms
  • CI/CD
  • Observability and production monitoring


One important thing

This is not a greenfield project.

The existing product has been built significantly with AI-assisted development.

We are specifically looking for an engineer who is comfortable inheriting an existing codebase, understanding it deeply, challenging its assumptions, fixing what needs fixing, and taking responsibility for making it production-ready.

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You won't just be implementing tickets.


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Location


Hyderabad preferred. Remote candidates across India may be considered for the right candidate.

Compensation


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ABOUT

The Persona Labs is building a new kind of social platform focused on something most social products do not explicitly optimize for: helping people become real friends.


We want to help people discover interesting people around them, find meaningful common ground, start low-pressure interactions, continue promising conversations, create shared experiences, and ultimately build real-life friendships.


DISCOVER → CURIOSITY → COMPATIBILITY → INTERACTION → UNDERSTAND → IRL EXPERIENCE → FRIENDSHIP


THE AI LAYER

Alongside the platform, we are building a proactive personal companion that learns about the user and helps them navigate this journey through personalized recommendations, suggestions, reminders and experiences.


THE OPPORTUNITY

We are looking for a Founding Product Engineer to help build the platform from the ground up. This is a 0→1 product engineering role where you work directly with the founder and engineering team to turn ambiguous product problems into working software.


You will be expected to:

Understand the problem → explore solutions → make trade-offs → design → build → ship → measure → improve.


WHAT YOU WILL BUILD & OWN


MOBILE

Onboarding, profiles, discovery, interactions, messaging, activities, and companion experiences.


SOCIAL SYSTEMS

Relationships, social graph, compatibility, and interaction flows.


BACKEND

APIs, services, authentication, notifications, and background processes.


DATA

PostgreSQL models, user/activity data, analytics, and behavioural signals.


REAL-TIME

Messaging, live interactions, notifications, and event-driven workflows.


AI-ENABLED

Recommendations, personalization, and companion-powered experiences.


INFRASTRUCTURE

Cloud deployment, CI/CD, monitoring, reliability, and cost management.


WHAT YOUR DAY-TO-DAY LOOKS LIKE

• Build and ship mobile and full-stack product features end-to-end.

• Design APIs, database models, and backend services for a social product.

• Translate ambiguous product problems into simple, reliable technical solutions.

• Make architecture and engineering trade-offs for performance, scalability, security, and cost.

• Work closely with the founder, product/design team, and Companion Intelligence engineer.

• Prototype quickly, test assumptions, and iterate based on user behaviour and product feedback.

• Own features from problem → architecture → implementation → deployment → improvement.

• Help establish engineering practices around testing, monitoring, security, and reliability.


WHO SHOULD APPLY

• Experience: 0–4 years, including exceptional fresh graduates. Strong 1–3 year engineers and experienced 3–4 year product builders are welcome.

• Fundamentals: Strong CS/software engineering fundamentals.

• Evidence of Building: We value what you have built more than the number of years on your résumé. Shipped apps, strong side projects, hackathons, internships, open source, or startup work are highly valued.

• Mindset: High ownership, curiosity, strong fundamentals, clear communication, learning velocity, and the ability to work through ambiguity.


WHAT WE LOOK FOR

MOBILE CAPABILITY

Can you build and ship a polished mobile experience?


ENGINEERING DEPTH

Do you understand why a system works, not just how to make it run?


PRODUCT JUDGMENT

Can you determine what should be built when the problem is ambiguous?


ARCHITECTURE / SYSTEMS

Can you reason across APIs, databases, services, real-time systems, scale, and cost?


SPEED OF EXECUTION

Can you move from idea → prototype → production quickly without compromising fundamentals?


AI FAMILIARITY

Do you understand how modern AI can become a useful, reliable product capability?


BUILD WITH US

You will join at a stage where many answers do not exist yet. You will not simply implement someone else’s architecture, you will help decide what the architecture and product should become.


CAREERS:

Apply with your resume, GitHub, portfolio or shipped work.

https://forms.gle/12YpUSBY2Sqs5xjp8

www.thepersonalabs.com

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Vijay Sales is a consumer electronics and appliances retailer, selling through its stores across India, its website and its app.

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We are hiring full stack engineers who can take a feature from spec to production across React, Node.js and MongoDB.


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We are looking for engineers with 3 to 6 years of experience who are comfortable owning both the front end and the back end of what they ship.


What you'll do

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  • Build messaging flows over WhatsApp, email and SMS, including delivery tracking, retries and fallbacks.
  • Work with the conversational AI team to expose order, invoice and support actions to the customer support bot.
  • Write tests, review code and own your features in production, including monitoring and fixing what breaks.
  • Work directly with product and operations teams to turn a business problem into a working release.


Our stack


React, Node.js and MongoDB are the core. Everything else in the table is what you will connect to or build alongside.


  • Front end: React, with Vijay Sales' in-house UI component libraries
  • Back end: Node.js services and REST APIs
  • Database: MongoDB
  • Messaging: WhatsApp Business, Amazon SES for email, RCS and SMS as fallback
  • Conversational AI: LangChain and Rasa, behind the customer support bot
  • Business systems: Order management (OMS), ERP, POS, Ticketing Systems


What we're looking for

  • 3 to 6 years of professional experience building and shipping web applications.
  • Strong JavaScript and TypeScript fundamentals: async patterns, the event loop, modules, error handling.
  • Solid React skills: hooks, state management, component design, performance on low-end mobile devices.
  • Hands-on Node.js experience: building REST APIs, authentication with JWT, role-based access, input validation.
  • Working knowledge of MongoDB: schema design, indexing, aggregation pipelines.
  • Experience integrating third-party APIs and webhooks, and handling their failures gracefully.
  • Comfort with Git, code review, automated tests and CI/CD.
  • Clear written and spoken communication. You will talk to operations and business teams, not only engineers.


Nice to have


  • Experience with the WhatsApp Business API, Gupshup or similar messaging platforms.
  • Exposure to LLM application development: LangChain, retrieval, tool calling, or bot frameworks such as Rasa.
  • Background in retail, e-commerce or order management systems.
  • Experience integrating with ERP or POS systems.
  • Familiarity with AWS, Redis and message queues.
  • React Native or other mobile app experience.


Why join and how to apply

  • Your work reaches real customers and store teams quickly. There is very little distance between a release and the people who use it.
  • You own features end to end, from the first conversation with the business team to production.
  • You get hands-on exposure to conversational AI and LLM-based products alongside core full stack work.


Read more
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The web is about to gain a second interface


Today, websites are designed for people. Agents must interpret pages, hunt for controls, and imitate clicks to accomplish anything.


We believe that will change. Websites will expose their capabilities directly to agents: structured, testable interfaces that work alongside the human experience. WebMCP is an early step toward that future. Signett is building the developer platform around it.


Our goal is to make creating an excellent agent interface as normal as building an API or testing a user interface.


The foundational product already exists. Signett has a public TypeScript library, documentation, benchmarks, real-world integrations, a website, and a Chrome extension. You would not be joining to turn a slide deck into an MVP. You would be joining to discover what makes a promising product become something developers genuinely adopt.


See it at signett.ai.


The opportunity


You would be Signett’s first hire and would have unusual ownership over the product’s direction.

Your job is to run one loop repeatedly:

  1. Find an external developer or team with a real reason to make its website agent-ready.
  2. Work inside its codebase and ship the integration.
  3. Identify what made the process difficult.
  4. Fix that friction yourself—in the library, documentation, testing tools, or extension.
  5. Publish what you learned so the next integration becomes easier.

You will move between engineering, product discovery, developer experience, and early distribution. There will be no handoff between those functions because, initially, you are the person connecting them.

The work could help establish how developers build and test agent interfaces for the web. It could also reveal that our present assumptions are wrong. Either outcome requires someone who cares more about finding the truth than defending the existing product.


The first 90 days


The initial targets are deliberately concrete:

  • Five external teams attempt the 30-minute integration.
  • At least three ship a real workflow without founder intervention.
  • Two remain active or request a paid capability such as shared history, CI, analytics, or evaluations.
  • Two reference integrations and case studies become public.

By the end, we should know which part of Signett developers truly value—exposure, testing, reliable execution, the Inspector, evaluations, or something we have not yet recognized.


You may be a strong fit if you have

  • Six to ten years of experience as a product-oriented full-stack or frontend engineer.
  • Strong TypeScript, React or Next.js, browser API, and Playwright or Cypress experience.
  • Built SDKs, developer tools, browser tooling, API infrastructure, or observability products.
  • Personally helped developers adopt something through documentation, examples, workshops, open-source work, or direct integrations.
  • Enough commercial instinct to find a design partner, lead the conversation, and turn the resulting work into a useful public case study.
  • The judgment and autonomy to make progress without daily direction.
  • Clear writing and demonstration skills in addition to strong engineering ability.

Experience with WebMCP or MCP is helpful but not required. Curiosity and the ability to learn an evolving standard matter more. The WebMCP proposal is public at github.com/webmachinelearning/webmcp.


The anti-sell


Signett has a product, but it does not yet have proven product-market fit. Adoption is the open question, and answering it is the core of this role.


You should not join if:

  • You want a role devoted entirely to writing code handed to you through a roadmap.
  • You expect someone else to find users, conduct interviews, write documentation, or publish the work.
  • You need a large team, established processes, or daily management to be effective.
  • Your experience is primarily managing mature organizations rather than building from ambiguity.
  • Your main strength is developer content without production software behind it.
  • You want to research or train models rather than build browser-based products developers use.
  • The uncertainty of an emerging standard makes you uncomfortable.
  • You need the stability and specialization of a conventional engineering position.

.

This is not a comfortable job with a “founding” title attached to it. It is a chance to take a technically serious, public product and prove—or disprove—that it deserves to become an important company.


How we will start


We begin with a paid four-to-six-week project involving a real external TypeScript application, not a synthetic coding exercise.

The purpose is for both sides to experience the actual work: finding a useful integration, shipping it, learning from developers, and improving Signett. If the collaboration works and the evidence supports continued investment, the intended path is a permanent, full-time role.

The work is fully remote. Compensation, location, time-zone overlap, and the terms of the initial project will be discussed transparently before the process begins.

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Byldd
Ayesha Siddiqa
Posted by Ayesha Siddiqa
Remote only
2 - 4 yrs
₹5L - ₹7L / yr
skill iconJavascript
TypeScript
skill iconMongoDB
skill iconReact.js
skill iconExpress
+4 more

About Byldd:

Byldd is a Startup Studio that helps founders launch and scale software companies. We work closely with founders to refine ideas, identify core pain points, build scalable software products, acquire initial customers, and support growth.


At Byldd, engineers get the opportunity to work on diverse and challenging projects across industries like fintech, healthcare, AI, operations, and enterprise software. Since we work with multiple startups at different stages, the problems are rarely repetitive — one week you may be building an AI-assisted workflow tool, and the next you may be architecting a scalable SaaS platform.


Our engineering culture is strongly focused on ownership, fast execution, and leveraging modern development workflows — including AI-assisted development using tools like Claude Code, Cursor, ChatGPT, GitHub Copilot, and other AI tooling to improve speed, quality, and problem-solving.


We primarily work with technologies such as React/Next.js, Node.js, TypeScript, MongoDB, and modern cloud infrastructure.


About the role:


We’re looking for experienced Full-Stack Engineers with a strong backend inclination to join us on core business projects.

Your role will involve understanding business requirements, product flows, and mockups. We’ll provide the “what” and the “why” behind the product decisions, and you’ll take ownership of translating them into scalable technical solutions.


While this is a full-stack role, the expectation is backend-heavy ownership — including system design, APIs, database architecture, integrations, scalability, and performance optimization. You’ll collaborate with founders and senior engineers to architect and build products end-to-end.

Since we move fast, we highly value engineers who can independently figure things out, use AI effectively in their workflows, and ship high-quality products with speed.


This role is ideal for someone who enjoys combining strong backend engineering fundamentals with modern AI-assisted development practices.


What You’ll Do

  • Build and ship scalable full-stack applications from scratch
  • Design and develop robust backend systems, APIs, and database architectures
  • Work closely with founders, designers, and product teams
  • Architect systems with scalability, maintainability, and performance in mind
  • Use AI-assisted development tools (Claude Code, Cursor, ChatGPT, Copilot, etc.) to improve development speed and productivity
  • Review, debug, and optimize production systems
  • Think through edge cases, reliability, and long-term scalability



Who you are: 

  • You have 2+ years of non-internship experience as a full-stack developer with strong backend expertise
  • You enjoy building products from 0 → 1
  • You think beyond tasks and understand business objectives
  • You are comfortable taking ownership and contribute towards making technical decisions
  • You actively use or are excited to use AI tools in your engineering workflow
  • You are strong in problem-solving and figuring things out independently
  • You care deeply about writing clean, maintainable, scalable code
  • You enjoy working in fast-paced startup environments
  • You’re comfortable contributing across the stack while being particularly strong on the backend side

Preferred Tech Stack

(Experience in some or most of the following is preferred)

  • Node.js
  • TypeScript
  • MongoDB
  • Express.js
  • React / Next.js
  • REST APIs
  • Cloud deployment & modern dev tooling

Experience with AI-assisted coding tools and workflows is a strong plus.


Location: Remote



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NAO
Remote only
3 - 10 yrs
₹10L - ₹15L / yr
skill iconReact.js
skill iconNodeJS (Node.js)
skill iconPostgreSQL
skill iconNextJs (Next.js)

NAO is building a B2B operational intelligence platform focused on strategic materials and critical components.

We are looking for a Senior Full-Stack Engineer to help turn an already-defined product concept and workflow into a working, customer-demonstrable MVP within 3 weeks.

This is not a website project. We need someone who can move quickly, make sound technical decisions, and build a reliable product demo.

Core Deliverables

  • Working web-based MVP
  • Frontend dashboard
  • Backend + database
  • Strategic materials & critical components data layer
  • Operational exposure and impact workflow
  • API / AI integrations where needed
  • Deployment and handoff

Please apply only if you have experience building B2B SaaS or data-heavy products and availability to start immediately / within 7 days.

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Wissen Technology
at Wissen Technology
4 recruiters
Umamaheshwaran V
Posted by Umamaheshwaran V
Hyderabad
6 - 11 yrs
₹1L - ₹35L / yr
skill iconAmazon Web Services (AWS)
skill iconNodeJS (Node.js)
skill iconReact.js
SQL

Job Overview

We are hiring a Senior Full-Stack Engineer to design and scale high-performance web applications. You will drive technical decisions using React, Node.js, and TypeScript while building event-driven cloud architectures.

Key Responsibilities

  • Develop scalable frontend features using React and robust backend APIs with Node.js/TypeScript.
  • Architect and deploy cloud-native microservices on AWS.
  • Implement asynchronous communication using messaging tools like Kafka, RabbitMQ, SQS, or SNS.
  • Optimize SQL/NoSQL databases and maintain automated CI/CD pipelines.
  • Mentor junior developers and lead code reviews.

Required Skills

  • 6+ years in full-stack software development.
  • Mastery of TypeScript, React.js, and Node.js.
  • Hands-on experience with AWS and modern messaging queues.
  • Strong problem-solving and communication skills.

Location: Hyderabad

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