Senior Software Engineer - Human Interest

About Human Interest

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, backed by top investors including BlackRock, TPG (The Rise Fund), SoftBank, Marshall Wace, and Baillie Gifford.

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 are key to earning our customers’ trust, you will build robust systems that are observable, maintainable, and scalable.

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, operating as the architect and decision-maker.
• 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 with both technical and non-technical stakeholders.
• Strong desire to learn, think creatively, and share knowledge with others.
• Enjoy mentoring other engineers and conducting thorough code reviews.
• Proactive and empathetic mindset focused on solving customer problems.
• Past experience working in startups and/or fintech.

Our Operating Principles

• Customer obsession: We put customer needs first and create amazing experiences.
• Long-Term Orientation: We think big, plan strategically, and invest in our future.
• Autonomous and Accountable Teams: We trust team members to take ownership and make smart decisions.
• An Escalating Bar for Talent and Performance: We constantly challenge ourselves to grow and improve.
• Fundamental Optimism: We believe in the power of positivity and the potential for greatness.

Benefits & Perks

• Competitive 401(k) plan with a dollar-for-dollar employer match up to 4% (immediately vested) and $0 plan fees.
• Top-of-the-line health, dental, and vision insurance.
• Competitive time off and parental leave.
• Addition Wealth: Unlimited access to digital tools, financial professionals, and resources.
• Lyra: Enhanced mental health support for employees and dependents.
• Carrot: Fertility healthcare and family forming benefits.
• Candidly: Student loan resources to help you and your family.
• Monthly work-from-home stipend and quarterly lifestyle stipend.
• Engaging team-building experiences and virtual social events.