Senior Software Engineer

Human Interest is on a mission to ensure that people in all lines of work have access to retirement benefits. More than half of all working Americans are not saving enough for their future. Too often, it’s because they are employed by a company that doesn’t offer a retirement plan. Human Interest is changing that by making it affordable and accessible for small and medium-sized businesses to offer employees a path to financial independence through retirement savings. We’re a high-growth fintech company changing the retirement industry. We are backed by a number of investors. This includes funding from Marshall Wace and Baillie Gifford, as well as top investors such as BlackRock , TPG (The Rise Fund) , SoftBank, Glynn Capital , NewView Capital, USVP, Wing, Uncork, and more. About the role As a Senior Software Engineer, you will build industry-first products that make retirement accounts simple and easy for employers to support and participants to use. You will collaborate with domain experts to design, build and test new features and systems. As reliability and auditability is key to earning our customers’ trust, you will build robust systems that are observable, maintainable, and scalable. As an engineering organization, we: • Value continuous improvement - we care about documentation, security, durability, not just throwing features over the wall. • Help each other be better engineers - we leave things better than we found it. • Aspire to collaborate seamlessly - we ensure our software is improving the customer experience. What you get to do every day • Design, build, and maintain our user experiences for both external and internal customers • Work on business-critical, foundational services which serve as the data funnel of our entire platform • Improve complex processes and systems to make them more robust and require less human intervention • Collaborate with other engineers and stakeholders to share knowledge and build expertise • Develop ownership over domains in our system and make informed engineering tradeoffs • Advocate for and delight internal and external users • Direct AI agents across the full development lifecycle, from prototyping and implementation to debugging and code review. Operate as the architect and decision-maker while AI handles the building • Expand what's possible with AI tooling and identify opportunities to automate repetitive engineering work, improve code quality through AI-driven review, and share effective patterns with your team What you bring to the role • 6+ years of experience building and maintaining software in production • Desire to work with the following technologies: Node, TypeScript, Kotlin, React, AWS, PostgreSQL, Kafka • Proficiency in leveraging AI coding assistants (e.g., Codex, Claude Code and Cursor) to accelerate development cycles and improve code quality • Top notch communication skills. You can communicate well with engineers and non-engineers alike • Strong desire to learn, think creatively, and share knowledge with others • Enjoy mentoring other engineers and deeply review their code • Proactive and empathetic mindset - you love to roll up your sleeves to fix problems for our customers • Past experience working in startups and/or fintech Why you will love working at Human Interest Human Interest is tackling one of our country's biggest challenges - closing the retirement gap. You'll be instrumental in architecting and scaling solutions that bring financial security to employees at small and medium-sized businesses nationwide. We’ve made significant progress, but there is still growth ahead, offering you a unique opportunity to solve complex problems, drive innovation, and advance your career alongside a dedicated, mission-driven team. We value hard