Senior Full Stack Software Engineer - Remote in US

Knock is redefining the home buying and selling experience, and we’re only getting started! We’re a passionate team of industry experts who knew there had to be a better, simpler way for people to navigate the journey between homes. That people-first mindset is core to how we operate, and why Knock has been honored as one of Inc.’s Best Workplaces six times in the past seven years.

We bring that mindset into the work we do every day.  The Knock Bridge Loan™ empowers homebuyers to ‘buy before they sell’, by unlocking the equity in their current home, giving them greater convenience, certainty, and competitiveness. 

Founded in 2015, Knock has grown into a trusted partner for thousands of homebuyers and a network of 60,000+ loan officers and agents across the country. Backed by top investors like Foundry Group, Trinity Capital, and the National Association of Realtors, we’ve built a reputation for innovation and trust, earning 900+ five-star Zillow and Trustpilot reviews and an A+ BBB rating. 

Join our growing team and help shape the future of homebuying! To learn more, visit Knock.com

Senior Full Stack Software Engineer

👋 As a Senior Software Engineer, you will play a key role in developing the technology that powers Knock.com and the platforms supporting our customers, partners, and internal teams. Your contributions will directly impact our ability to deliver a seamless, world-class experience.

This position is primarily backend-focused but requires strong expertise across the full stack.

What You’ll Do:

✅ Design, develop, and maintain backend services, APIs, and data pipelines that power Knock's customer-facing and internal applications — with occasional frontend contributions to support full-stack delivery when needed.
✅ Architect and build scalable backend services using Node.js and TypeScript that power Knock's customer-facing and internal applications, ensuring they integrate seamlessly with our frontend experiences.
✅ Own end-to-end delivery of complex integration projects, including third-party lending systems and RESTful/RPC APIs, ensuring robust data synchronization, error handling, and seamless service-to-service communication.
✅ Own end-to-end delivery of complex integration projects, such as connecting our platform with third-party lending systems, ensuring robust data synchronization and error handling
✅ Contribute to AI-powered features and initiatives, integrating AI services (such as LLMs or ML APIs) to enhance our risk analysis and decision-making capabilities.
✅ Collaborate with engineers, product managers, designers, and business partners to create innovative, impactful technology solutions that deliver excellent user experiences.
✅ Champion best practices in architecture, security, testing, monitoring, and deployment to ensure our applications are scalable, secure, and reliable throughout the development lifecycle.
✅ Provide mentorship, share knowledge, and take initiative on technical challenges — exploring new tools and approaches to support your team across backend architecture, integrations, infrastructure, and beyond.
✅ Take initiative on technical challenges, explore new tools and approaches, and support your team wherever your skills can contribute most — from backend architecture and integrations to infrastructure improvements and occasional frontend work.
✅ Join a rotating on-call schedule, helping ensure system reliability and rapid response when needed.

What You Bring:

• At least 5 years of experience building production-grade software, with at least 3 years writing production-level Node.js code using modern frameworks like Fastify or Express.
• Backend expertise using TypeScript and Node.js (required) — proven ability to design and implement scalable RESTful and/or RPC-style APIs, integrate with complex third-party systems, and handle data synchronization challenges, API versioning, and error scenarios. Experience with GraphQL is a plus.
• Experience integrating AI/ML services into production applications — such as LLM integration (OpenAI, Anthropic), prompt engineering, or building features that leverage AI for ranking, scoring, or decision support (highly desired).
• Product-minded engineering approach — comfortable working with ambiguous requirements, making pragmatic scope decisions, and designing solutions that truly solve user problems, not just implementing specifications.
• Can contribute to frontend work when needed — comfortable reading and making changes to React/