Senior Full‑Stack Software Engineer (NodeJS/TypeScript/AI)

Contact: hello@housenumbers.io

Website: http://housenumbers.io

About House Numbers

The U.S. mortgage industry originated 4.3 million loans in 2023, with $25 billion in origination labor costs. House Numbers is transforming inefficient, outdated processes in a slow-moving sector with an AI-powered mortgage loan processing service that delivers 50%+ cost savings, faster response times, and a shorter time to close, without requiring brokers or lenders to change their existing systems. Starting with independent brokers, our pay-per-loan pricing model allows us to scale profitably while still deeply undercutting the standard third party processing fees. We are backed by leading Silicon Valley venture‑capital funds and angel investors, including Resolute Ventures, Maven Ventures, and Uncommon Capital.

About the role

As a Senior Full‑Stack Engineer on a small team, you’ll join a fast‑moving group where every engineer owns meaningful product surface area. Demand for our AI‑assisted processing platform is accelerating, and we’re expanding the engineering team to build new customer‑facing features and keep our infrastructure resilient as we scale.

We’re looking for someone who is excited about owning the entire development of product flows and features across our codebase. You’ll help decide the patterns and practices adopted company‑wide and touch every part of the development process—shipping production‑ready code daily, actively shaping the product roadmap, spotting and addressing process improvements, coding with TDD/BDD, following agile methodologies based on the team needs, and driving the changes needed to keep us moving quickly and safely.

Our tech stack includes

• Frontend: Remix, React, Typescript, and Tailwind
• Backend: Node / Express, Mongo, Docker, Kubernetes clusters (EKS), CI/CD on CircleCI, infrastructure on AWS using ECR and ECS, LLMs on OpenAI and Orq.

Bonus points

• Containerization & orchestration knowledge (Docker, Kubernetes, Helm)
• Observability skills (OpenTelemetry, Prometheus, Grafana)
• Familiarity with infrastructure‑as‑code (Terraform)
• Experience in mortgage‑tech / fintech or other regulated domains
• A master of using AI-enabled tools to increase your productivity as an engineer (Cursor, obviously, and more!), while maintaining code quality

Responsibilities of the role

• Partner with Product, Operations and Design to drive roadmap and execution.
• Develop and iterate quickly based on user feedback, quantitative metrics, experience and intuition.
• Push the limits of LLM and ML capabilities (including agentic AI) to automate loan processing workflows, enabling us to deliver a better quality service more and more efficiently over time.
• Evolve our technology and architecture for the challenges ahead.
• Maintain and support high-quality and reliable services.
• Continuously deliver small, high-quality changes to production.

What we’re looking for

• Significant, relevant experience with Node/JavaScript/TypeScript. We won’t set an arbitrary number of required years of experience here, but you must be a senior developer comfortable across all software development lanes and have broad problem solving skills.
• Significant, hands‑on experience embedding LLMs into production apps (prompt design, evals and version control, retrieval‑augmented generation, vector stores, etc.) or deploying ML models/services.
• Someone who is highly productive and has contributed a significant amount of code to a new project -- either at a startup or within a larger organization -- in a collaborative, cross-disciplinary environment.
• Promote testing as a natural part of your coding efforts.
• Experience solving distributed architectural challenges.
• You should be excited to have a lot of impact and responsibility. We do not sign off and forget about work for the entire weekend when something important needs to be done. :)
• Someone approachable and friendly, who has strong communication skills. Though we are a multi-lingual team — Spanish, English, Portuguese, and more — full English fluency and comfort is required. We love over-communication and prioritize collaboration, pair programming and code review.
• A positive, relaxed and curious approach to solving problems. A true team-player with no ego.
• Someone willing to give 100% (or more!) of their professional efforts to the company, i.e., no moonlighting allowed, please.

Join us as we innovate and create cutting-edge solutions that drive success!

Job Type: Full-time

Pay: $60,000.00 - $120,000.00 per year

Compensation Package:

• Bonus opportunities
• Yearly pay

Work Location: Remote