Senior Full Stack Software Engineer

• 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
• Own end-to-end delivery of complex integration projects, including third-party lending systems and RESTful/RPC APIs
• Contribute to AI-powered features and initiatives, integrating AI services
• Collaborate with engineers, product managers, designers, and business partners to create innovative, impactful technology solutions
• Champion best practices in architecture, security, testing, monitoring, and deployment
• Provide mentorship, share knowledge, and take initiative on technical challenges
• Join a rotating on-call schedule, helping ensure system reliability and rapid response when needed

• At least 5 years of experience building production-grade software
• 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)
• 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
• Can contribute to frontend work when needed — comfortable reading and making changes to React/Next.js codebases
• 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
• 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
• Belief in creating diverse, equitable, and inclusive practices and programs
• Proven success working 100% remote in prior positions & experience working with a distributed, national team

Experience with GraphQL is a plus

• Top tier medical, dental, & vision benefits for full time employees starting on the first day of employment
• Flexible Paid Time Off for full time employees
• Paid parental leave for all full time employees
• One thousand annually for professional development
• Life, AD&D and Disability insurance for full time employees
• 401K (noncontributory by Knock) for all employees
• $75 monthly allowance for health & wellness
• Up to $400 monthly for a co-working space for eligible employees
• $100 monthly allowance for home internet, mobile phone or other communication devices
• $2,500 referral bonus for eligible employees