Senior Fullstack Engineer (US)

Austin
Engineering /
Full-time Employee /
On-site
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 - Choose your laptop!
    • Team Offsites Around the World – In 2024, we gathered in Poland, Mexico, and Florida - where to next?
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!