Senior Software Engineer.

 About the role

At Hummingbird, we’re building better software to fight financial crime—and our engineering team makes that mission possible. As a Senior Software Engineer on the Cortex Team, you’ll play a key role in driving AI at Hummingbird. You’ll design and deliver customer-facing AI features that make complex work more intuitive and efficient, and iterate on existing features, like our context-aware AI Assistant and Review Agent.

In this role, you’ll collaborate closely with Product, Design, and other engineers to bring ideas to life—from prototyping to production. You’ll balance thoughtful model and tool selection with sound engineering principles, ensuring our systems are scalable, secure, and auditable. The projects you’ll take on are often ambitious and open-ended, and you’ll have the trust and autonomy to drive them from concept to completion.

We’re looking for someone who’s curious, collaborative, and motivated by impact—someone who thrives in the messy middle of hard problems and helps bring clarity and direction to the team. If you’re excited to use AI and data to make the world’s financial systems safer and more transparent, we’d love to meet you. 

What you'll do:

• Build AI features end-to-end. You’ll design, implement, and ship features that bring great user experiences to life —with a strong focus on measurement, observability, and real-world performance.
• Scale for impact. You’ll architect and deliver systems that handle high data volumes and complex workflows with reliability and speed, ensuring our AI features are as resilient and efficient as they are powerful.
• Enhance trust and transparency. You’ll improve grounding quality with permission-safe retrieval, citations, and evaluations that make AI outputs auditable and dependable.
• Optimize for experience. You’ll drive latency and cost improvements where they matter most—creating fast, seamless interactions for our users.
• Shape the product and strategy. You’ll collaborate closely with Product and Design from discovery through iteration, helping define what AI can do for our customers. Great ideas come from everywhere, and your voice will help shape where we go next.

What we're looking for:

• Experience that matters. You’ve shipped 0-1 products to real users (ideally AI products!) and are excited to keep pushing the boundaries of what’s possible.
• Safety first. You care deeply about quality, testing, and security—because trust and reliability are non-negotiable foundations of scalable systems.
• Curiosity and creativity. You love learning new technologies, exploring unfamiliar domains, and turning complex ideas into elegant, understandable solutions.
• Purpose-driven builder. You want to use your technical skills to create something meaningful—AI that helps make the world’s financial systems safer and more transparent.
• Strong engineering fundamentals. You bring solid backend experience, data fluency, and operational maturity to every project.
• Iterative mindset. You enjoy refining ideas, incorporating feedback, and improving through collaboration.
• Product intuition and communication. You think beyond code, partnering effectively with Product and Design to build features that delight and empower users.
• Bonus points for: Experience with OpenSearch or other vector databases, Snowflake, evaluation frameworks like Langfuse, or familiarity with fintech and compliance domains.

Technologies we use and teach:

• AWS, Azure, PostgreSQL, Redis
• Terraform, CircleCI, Nix, Docker
• Ruby/Rails, Python
• OpenAI
• React, JavaScript, TypeScript, GraphQL, d3