Senior Software Engineer, Mobile/Frontend

Belfry; New York (NY); On-site; USD 120,000 - 180,000; Full time

Benefits offered by this job

Significant equity in a high-growth

Fully covered healthcare, dental, and

Unlimited PTO and 11 paid holidays

Job summary

Belfry is hiring software engineers in New York to build our mobile and frontend platforms using React Native and Expo. You will own substantial frontend work, contribute to the design system, and help shape Belfry's product and culture in a fast-growing startup.

You’ll occasionally tackle backend tasks and API work, mentor teammates, and participate in efforts to accelerate development with AI-powered tooling. Equity rewards reflect contribution and company growth.

Qualifications

• Hands-on experience with React and React Native (Expo).
• Strong frontend and mobile development ownership.
• Excellent communication and collaboration across teams.

Responsibilities

• Develop and evolve Belfry's mobile app (React Native/Expo) and extend to web.
• Improve UI, design systems, and observability across mobile and web.
• Contribute across the full stack when needed (APIs, backend, integrations).
• Leverage AI-powered coding tools to boost team velocity and quality.

Skills

React

React Native

Expo

Frontend

Backend

Python

Ownership

Team leadership

Job description

About Belfry

At Belfry, we're changing how the $50 billion Security Guard Services industry operates. Our mission is simple but ambitious: to empower both back-office teams and field officers with the tools they need to excel through our state-of-the-art operating system.

About Belfry

At Belfry, we're changing how the $50 billion Security Guard Services industry operates. Our mission is simple but ambitious: to empower both back-office teams and field officers with the tools they need to excel through our state-of-the-art operating system.

We are looking for Software Engineers to help build our products and our culture. The role is ideal for engineers who want the full early-stage startup experience: opportunities to shape our tech stack, garner real product ownership, learn directly from both industry experts and investors, build a team, and earn equity rewards commensurate with your contribution.

Your deepest expertise and focus will be working on our mobile and frontend codebases. But, we are a small and flexible team and we'll also expect you to pitch in full stack as needed.

What You'll Accomplish

• Help evolve Belfry's mobile app built on React Native / Expo, ensuring field officers have reliable, performant tools in their hands every shift — then extend that same standard of quality to our React web platform.
• Improve how we build UI — contributing to best practices, observability, and design systems across mobile and web that the rest of the team rallies around.
• Contribute across the full stack when needed — whether that's building an API endpoint, debugging a backend service, or wiring up a new integration.
• Leverage agentic development workflows — help the team adopt and get the most out of AI-powered coding tools, making everyone faster and more effective.

About You

• Strong communicator: You can clearly explain your ideas and views on everything from technical architecture to product design.
• Ownership-focused: You're excited to work in an environment where you'll have a high degree of responsibility for the product and a hand in shaping Belfry as a company.
• Team-driven: You see work as a collaborative endeavor — you value growing in your role while helping those around you grow as well. You're energized by the idea of mentoring other engineers and eventually leading a team.
• Deep React expertise: You have more than one year of hands-on experience building with React and ideally React Native + Expo.
• UX-minded: You care about the craft of building great interfaces — not just that it works, but that it feels right for the people using it.
• Comfortable across the stack: You have expertise in the frontend, but you're not afraid to dive into backend code, APIs, or infrastructure when the team needs it. Familiarity with Python is a bonus.
• Technically strong: Typically 3+ years of experience as a software engineer, with a track record of owning mobile or frontend projects.
• Always learning: You bring an open mindset to your craft — you're not tied to one framework, you pick the right tool for the job, and you're actively exploring how AI coding tools are changing the way software gets built.

Benefits

• An incredible team with fantastic experience and track record
• Highly competitive salary
• Significant equity in a high-growth startup with a clear path to significant outcomes
• Fully covered healthcare, dental, and vision
• Unlimited PTO (and strong encouragement to use it!) + 11 paid holidays