Senior Front End Engineer

Blitzy; Boston; On-site; PHP 8,766,000 - 11,897,000; Full time

Job summary

Blitzy, a Cambridge, MA based AI software platform, is seeking a Senior Frontend Engineer to lead hands-on development of our AI-powered interface. You will work with product and design to build responsive, accessible UIs and guide frontend strategy.

You will write high-quality code, own frontend architecture, collaborate with backend to design APIs, and mentor two frontend engineers. Strong React and JS/TS expertise required.

Qualifications

• 10+ years frontend development experience.
• Expert in JavaScript/TypeScript and React ecosystem.
• Experience with state management, build tools, and testing.

Responsibilities

• Spend majority of time (70%+) writing high-quality code and solving complex technical challenges.
• Architect and implement sophisticated frontend solutions with complex state management and real-time updates.
• Own frontend architecture and technical decision-making for long-term scalability.
• Create responsive, performant interfaces across devices and browsers.
• Collaborate with designers to implement pixel-perfect UIs and evolve the component library.
• Maintain high standards for code quality, performance, testing, and best practices.
• Lead code reviews and establish frontend engineering standards; mentor two frontend engineers.
• Evaluate and introduce new technologies to strengthen workflow and product quality.
• Partner with backend to design APIs enabling rich frontend functionality.
• Own the core product interface and user experience from a frontend perspective.

Skills

JavaScript/TypeScript

React.js

State management (Redux/MobX)

Build tools (Webpack/Vite)

Frontend testing

Tools

Webpack

Vite

Job description

Blitzy is a Cambridge, MA based AI software development platform on a mission to revolutionize the software development life cycle by autonomously building custom software to unlock the next industrial revolution. We're transforming how enterprises build software, turning enterprise requirements into enterprise grade code with an agentic software development platform that can autonomously execute 80% of the quantum of software development work. We're backed by multiple tier 1 investors, and have proven success as founders of previous start-ups.

Our Culture

Who we are:

Led by two pioneering co-founders we are one of the fastest growing companies in the U.S., creating our own category of enterprise autonomous software development. We automate thousands of hours of software development for our customers, which includes strong representation within the Fortune 500.

How we work:

• We move Blitzy Fast: Time is both our company’s and our clients’ most precious asset. We move quickly and decisively to innovate internally and deliver exceptional software externally.

• Championship Mindset: We operate like a professional sports team. We win as a team by holding ourselves and each other to high standards, collaborating in-person, and remaining focused on the mission.

• Passion for Invention: We’re pushing the frontier of what’s possible, requiring constant innovation and iteration.

• We Work for the Customer: We focus on delivering outsized value to the customers we work with and expanding those relationships into deep, meaningful partnerships.

About the Role

We are looking for a Senior Frontend Engineer to join our team as a technical leader and primary individual contributor. This role is first and foremost focused on hands‑on development of our cutting‑edge AI‑powered platform. You'll work directly with our product and design teams to build sophisticated, responsive, and intuitive interfaces that make complex AI capabilities accessible to users.

Responsibilities

• Spend the majority of your time (70%+) writing high-quality code and solving complex technical challenges

• Architect and implement sophisticated frontend solutions that handle complex state management, real-time updates, and evolving product needs

• Own frontend architecture and technical decision‑making, balancing immediate requirements with long‑term scalability

• Create responsive, performant interfaces that work seamlessly across devices and browsers, while continuously optimizing and monitoring frontend performance

• Collaborate with designers to implement pixel‑perfect UIs and evolve the component library and design system while maintaining code quality and performance

• Maintain high standards for code quality, performance, testing, and frontend development best practices

• Lead code reviews and establish frontend engineering standards while providing technical guidance and mentorship to two frontend engineers

• Evaluate and introduce new technologies, tools, and build‑system improvements that strengthen the development workflow and product quality

• Partner closely with the backend team to design and implement APIs that enable rich frontend functionality

• Own the core product interface and user experience from a frontend engineering perspective

Qualifications

• 10+ years of frontend development experience with expert‑level knowledge of modern JavaScript/TypeScript

• Deep expertise in React.js and its ecosystem, including state management approaches (Redux, MobX, or similar)

• Experience with modern build tools (Webpack, Vite, etc.) and frontend testing frameworks and methodologies

• Proven track record of building complex, production‑grade, responsive applications with strong cross‑browser compatibility

• Strong understanding of web performance optimization

• Background in building developer tools or AI‑powered applications is a plus.