Senior Software Engineer

Summary

Join Mercury's Growth Infrastructure team and be at the forefront of the company's expansion by developing a public-facing API. You will grow Mercury’s Public API to enable seamless partner integration, expand and refine public endpoints, design and implement API security measures, optimize performance and scalability, and develop versioning strategies. This role requires strong collaboration with cross-functional teams. The ideal candidate possesses extensive software development experience, particularly with APIs, and a passion for growth-related challenges. Mercury offers a competitive total rewards package including base salary, equity, and benefits.

Requirements

• Has 6+ years of software development experience, with a knowledge of or excitement to learn Haskell
• Is highly autonomous and thrives in a fast-moving environment, capable of making impactful product and technical decisions
• Is passionate about APIs and understands how to design and maintain robust, developer-friendly interfaces that drive adoption and engagement
• Has strong product thinking—you should be excited about working on growth-related challenges and be comfortable prioritizing impactful work that increases user acquisition
• Has experience with system design and architecture, with a track record of making tradeoff decisions and measuring their impact over time
• Has expertise in API security and understands best practices for protecting sensitive data
• Enjoys cross-functional collaboration, working closely with stakeholders across product and sales to align API development with Mercury’s growth strategy
• Is comfortable navigating ambiguity, iterating quickly, and focusing on the highest-leverage opportunities to scale Mercury’s distribution through API partnerships

Responsibilities

• Grow Mercury’s Public API to enable seamless partner integration, making Mercury’s financial services more accessible across diverse ecosystems
• Expand and refine our public endpoints to drive distribution and scale Mercury’s presence in partner products, accelerating new customer acquisition
• Design and implement API security measures including authentication, authorization, and compliance to ensure safe and scalable integrations
• Optimize performance and scalability to handle high-throughput traffic and provide a seamless experience for partners embedding Mercury
• Develop and maintain versioning strategies to ensure stability and backward compatibility while quickly iterating on features
• Unlock new partnership opportunities by refining tools and levers that remove friction in integrations, enhancing adoption, and driving growth

Benefits

• Base salary
• Equity (stock options)
• Benefits