Knock is redefining the home buying and selling experience by providing a better, simpler way for people to navigate the journey between homes, specifically through the Knock Bridge Loan™ which empowers homebuyers to 'buy before they sell'. The Senior Full Stack Software Engineer will play a key role in developing the technology that powers Knock.com and its supporting platforms to deliver a seamless, world-class experience.
Requirements
- 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).
- Can contribute to frontend work when needed — comfortable reading and making changes to React/Next.js codebases, even if frontend development isn't your primary focus.
- Database proficiency — solid experience with RDBMS and SQL (MySQL or PostgreSQL), including database design, writing and optimizing queries.
- Solid understanding of software engineering fundamentals and experience across the full development lifecycle — including requirements gathering, development, testing, deployment, instrumentation, monitoring, and ongoing maintenance.
- Cloud infrastructure experience — familiarity with at least one major cloud provider (AWS preferred) and hands-on experience with services like ECS, RDS, Lambda, S3, CloudWatch, plus CI/CD pipelines and application performance monitoring tools.
Responsibilities
- 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.
Other
- 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.
- 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.
- Belief in creating diverse, equitable, and inclusive practices and programs that will further Knock's commitment to making an impact, learning, putting people first, being open, and courageous.
