Senior Fullstack Engineer

Why join us?

Handoff is the AI agent that runs a construction company. We help remodelers automate estimating, streamline operations, and win more work - backed by real-time cost data, intuitive design, and workflows that “speak contractor.” With over 10,000 monthly active users and $6B in annualized project volume already flowing through our platform, we’re becoming the trusted partner for the people who build our homes.

We are backed by $25M+ raised from Y Combinator, Sequoia, Initialized, and Greycroft. Our team is distributed across hubs in Austin, São Paulo, and Buenos Aires, and we are deeply focused on building intuitive, high-impact solutions that make a real difference for our users.

Senior Fullstack Engineer at Handoff

You’ll play a pivotal role in shaping both the frontend and backend architecture of Handoff, ensuring seamless performance, scalability, and a best-in-class user experience across mobile and web. This role goes beyond coding—you’ll be deeply involved in understanding contractor workflows, using AI-powered automation to simplify processes, and driving the technical evolution of our platform. You’ll collaborate closely with design, product, and AI teams to build a high-impact, user-centric system.

What you'll do

• Develop scalable frontend and backend systems, including APIs, services, and interfaces, to support AI-driven workflows, with a focus on usability, speed, and performance.
• Develop and maintain scalable backend APIs that power AI-driven workflows.
• Partner closely with product, design, engineering, and AI teams to align on requirements and ensure that our solutions deliver seamless, cohesive user experiences.
• Provide constructive code reviews, share knowledge, and mentor fellow engineers, contributing to a collaborative, high-performing team.
• Evaluate and adopt new tools, frameworks, and processes to improve frontend performance, efficiency, and code reliability, always with the customer experience in mind.

About You

• Bachelor's degree (or similar) in Computer Science, Engineering, or a related field.
• 7+ years in frontend and backend development, with a proven track record of building scalable, high-performance applications.
• Strong proficiency in Typescript , Node and React Native.
• Experience working with Python, SQL, and cloud-based architectures.
• Experience optimizing API performance and database queries, reducing latency and ensuring seamless data flow between backend and frontend.
• Experience designing and implementing responsive, high-quality frontend components that ensure a seamless, intuitive user experience across both mobile and web platforms.
• You write clean, maintainable, and testable code while enforcing best practices in software development.
• Experienced in working with design and product teams to deliver cohesive solutions, with clear and proactive communication.
• Comfortable in a fast-paced environment, you’re quick to adapt to changing priorities and balance rapid iteration with high-quality outputs.
• Proven experience working in a startup environment is a must.

What we offer

• Competitive Salary + Equity
• Unlimited Paid Time Off (PTO)
• 401(k)
• Medical, Dental & Vision Insurance
• Life & Disability Insurance
• Flexible Spending Account (FSA)
• Dependent Care FSA (DC FSA)
• Relocation Allowance
• Top-Notch Equipment
• Team Offsites Around the World!

$165,000 - $200,000 a year

If you’re passionate about building exceptional user experiences across the stack and want to join a team that values product impact and technical excellence, we’d love to hear from you!

We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.