Senior Software Engineer - Frontend Developer Experience

Mercury is a rapidly growing fintech company looking for a Senior Software Engineer - Frontend Developer to strengthen their frontend foundations. The role involves evolving the React, TypeScript, and Vite infrastructure, optimizing testing platforms, and ensuring stable CI/CD pipelines to enhance the efficiency of their engineering teams.

Responsibilities:

• Strengthen the frontend foundations every Mercury engineer builds on. Evolve our React, TypeScript, and Vite infrastructure to support teams in shipping ambitious product work with speed and confidence
• Help engineers move efficiently with automation. Use static analysis, local tools, and LLM coding tools to help engineers quickly resolve the schlep so they can focus on what matters
• Optimize our testing platform for fast feedback loops and high confidence. From unit tests to visual snapshots, you’ll provide the QA tools product teams need to move both quickly and safely
• Make our CI/CD pipelines stable, ergonomic, and fast. Mercury ships fast— dozens of deploys to prod per day, and hundreds more commits on PR branches. You’ll keep the pipeline humming so Mercury’s engineers stay in flow and customers see fixes faster
• Make our systems and organization observable. Drive decisions by unifying technical metrics from our tools with sentiment metrics from developer surveys. When that data doesn’t exist yet, you’ll build the observability that lets the team move with confidence
• Foster enthusiasm about frontend work at Mercury by making the good path the easy path, and by representing our work in larger venues

Requirements:

• Has 6-8+ years of software development experience, with a strong focus on the frontend and deep experience with React and Typescript
• Has experience leading complex engineering projects, such as projects that cut across multiple teams and functions, have multi-stage rollouts, or require research and consensus-building before action
• Is a confident communicator, adept at communicating across organization boundaries, and driving discussions to productive ends
• Has maintained internal libraries or platform tooling that other engineers depend on
• Prioritizes being helpful, taking initiative to make other developers' lives easier
• Has a thorough understanding of modern frontend developer tooling and workflows, including build systems, CI/CD, web hosting, and testing
• Dives into the gnarly side of the web platform— when it matters, happy to dig into Vite internals, upstream a fix, or bring a broken deploy pipeline back to life
• Balances practicality with ideals, pushing the team to reach an ambitious North Star while charting a course there that matches our reality