Mainframe Developer

Job Title: Founding Engineer / Senior Full Stack Developer (Electron + AI Platform)

Location: Mumbai

Type: Full-time

Compensation: ₹17–20 LPA + 0.4% Equity (ESOP Pool)

Role Overview

We’re hiring a Founding Engineer / Senior Full Stack Developer to help us build an advanced desktop application designed for secure, intelligent, and autonomous workflows. You’ll be one of the first engineering hires and play a critical role in owning the entire product engineering stack—from interface to system orchestration.

This is a high-ownership role for someone who thrives in early-stage environments, enjoys building performance-focused desktop systems, and wants to work at the cutting edge of AI-enabled automation.

What You’ll Work On

• Architect and build a high-performance Electron-based desktop application
• Develop intelligent frontend workflows using React 18, TailwindCSS, and TypeScript
• Build scalable backend services in Node.js 20 with support for secure tool orchestration
• Integrate with external systems like CLI tools, terminal processes, file systems, and MCP-like interfaces
• Build efficient local storage, memory, and prompt-pipeline management systems
• Work on token and session lifecycle, agent command execution, and sandboxed operations
• Ship cross-platform (Windows & macOS) builds using Electron and Vite pipelines

Tech Stack

You should already be comfortable with most of the following:

• Frontend: React 18, Tailwind CSS, TypeScript, Vite
• Backend: Node.js 20, Express.js, CLI process spawning, OS-level scripting
• Desktop: Electron 25, IPC communication, Electron Forge/Builder, native packaging
• AI/Agent Integration: REST APIs to LLMs (Claude, GPT, etc.), prompt engineering, token/tokenizer management
• System-Level: File system manipulation, workspace persistence, multi-threaded job handling
• Tool Control & Integration: Interfacing with command-line tools (MCP-like integrations), automated I/O
• Other: GitHub Actions, secure storage, error logging, telemetry pipelines

What We’re Looking For

• 4+ years of full stack development experience with real-world Electron app delivery
• Strong proficiency in JavaScript/TypeScript (ES6+), including bundling and module systems
• Production-level experience with React and managing state in large apps
• Deep understanding of backend architecture, async task management, and secure file handling
• Ability to work independently in a fast-paced early-stage environment
• Comfortable with cross-platform builds (Windows & macOS)
• Bonus: Experience with embedded AI assistants, autonomous agent frameworks, or toolchain orchestration

What We Offer

• Competitive salary: ₹17–20 LPA
• 0.4% equity via ESOP pool (with early joining incentives)
• High autonomy and strategic influence—work as a true co-creator
• Remote-friendly and async collaboration culture
• Opportunity to build a developer-first product from scratch with real AI depth

Remote position

Full-stack developer | .NET Core + Angular

Are you...

• Interested in working at a successful, well-funded scale-up where every team member can make a huge contribution?
• Keen to make software that people will use every single day to make their lives easier?
• Excited to work on greenfield projects with responsibility and independence?
• Ready to develop and use your skills across our frontend, backend and mobile offerings?
• Meticulous about quality, and gifted with a strong desire to write beautiful code?

About the company

KeyNest solves the key exchange problem for Airbnb users. Our worldwide network of over 4,000 shops store keys so that Airbnb guests / cleaners / contractors can pick them up whenever is convenient for them. As a global partner of Airbnb we’ve checked-in over 2 million guests.

Why we need you

As the entire Airbnb ecosystem increasingly relies on KeyNest, our customers expect us to integrate additional features without reducing the ease of use that our customers love. This is why we continue to invest in beautiful, intuitive user interfaces that integrate with every tool and are used by our customers, their guests and staff, as well as our own staff.

A product manager, a team lead, two full-stack developers, one mobile developer, and a UX designer make up our product team. Who will serve as your mentor. We are looking for a developer who cares about how their code affects users so that we can work together.

With a genuine passion for high quality work, attention to detail and readiness to own your own projects, you will be looking for a new and exciting challenge which allows you to use your experience to drive change and maintain the high standards of our organisation.

Our Tech Stack

• C# MVC modern tech stack
• .Net Core
• Front end web in TypeScript & Angular
• Test Driven Development (TDD) and follow SOLID design principles.
• EF 6.0
• SQL Server 2017
• Agile experience (Scrum, Kanban)
• TFS
• Cloud hosted in Azure with micro-services architecture

Your qualities

• 5+ years experience in C#
• Experience with .NET core
• Front-end web experience in Angular and CSS
• Track record of building great products
• You’ll love the idea of being a big part of a small team. Current team size is 5.
• Motivation and ambition to succeed in a fast-paced environment
• Not afraid to take on responsibilities

What we offer

• Crucial role in a funded, dynamic & fast-growing scale-up shaking up the sharing economy
• Competitive salary based on relevant experience
• Flexible working for our most committed staff
• Unparalleled opportunities to develop your career as the company develops rapidly

If you want to join the KeyNest team, please get in touch – we look forward to meeting you.

We are an equal opportunity employer and value diversity at our company. We do not discriminate on the basis of race, religion, colour, national origin, gender, sexual orientation, age, marital status, veteran status, or disability status.

• 1-5 years of experience in a full stack software development role.
• Experience in technologies - PHP, Bootstrap, Vuejs and MySQL.
• Knowledge of Cloud services (GCP/AWS), MongoDB and Nodejs is a plus.
• Experience of working in an Agile environment
• Ability to design for scale and performance
• Ability to do peer code reviews
• Solid problem-solving skills

Responsibilities:

• Design, develop, and maintain software applications.
• Go the extra mile to identify customer needs and pain-points. 
• Relentless focus on delivering high quality, bug-free code.
• Closely work with the SRE and DevOps team to set up microservices infrastructure. 
• Maintaining and auditing code/design quality as per set guidelines and standards in assigned projects.
• Testing of completed tasks in ongoing projects in the team before sending updates to reporting authority/client.
• Participate in application design, code reviews and documentation.

Requirements:

• Experience in agile development process.
• Excellent knowledge of HTML5, CSS3.
• Excellent knowledge of JavaScript.
• Experience with cross-browser, cross-platform and design constraints on the web
• Good understanding and experience of working on Vue.js/React.js.
• Prior experience building REST APIs
• Hands-on experience with Node.js/Golang/Java + Redis + Elasticsearch.
• Experience with AWS/GCP is a plus
• Knowledge of version control systems like GIT.
• Experience in developing automated unit and functional tests
• A minimum of 1 year of experience is needed.

We are looking for a passionate full-stack developer to be responsible for all platform-related duties, from developing designs for complicated applications to analyzing code. The key responsibilities include writing and testing code, debugging programs, and integrating applications with third-party web services, optimizing applications, ensuring UI/UX feasibility, and implementing API designs and architecture.

You should know python and use server-side logic. Ultimately, you'll build highly responsive web applications that align with our business needs.

Selected day-to-day responsibilities include:

1. Writing effective, scalable, and sustainable code
2. Developing back-end components to improve responsiveness and overall performance
3. Integrating user-facing elements into applications
4. Testing and debugging programs
5. Improving the functionality of existing systems
6. Implementing security and data protection solutions
7. Assessing and prioritizing feature requests
8. Ensuring the feasibility of UI/UX designs
9. Coordinating with internal teams to understand user requirements and provide technical solutions