Sr. Software Engineer, Backend in London

At Acorns, our mission is to look after the financial best interests of the up-and-coming, beginning with the empowering, proud step of micro-investing. Our values guide us, and our mission drives us. Come join us and help deliver financial wellness for the whole family, putting the tools of wealth-making into everyone’s hands.

Acorns is seeking a Senior Backend Engineer to serve as a technical pillar for the team that builds and scales our core investment offerings. In this role, you will go beyond execution—you will be responsible for the technical integrity and architectural evolution of systems that help millions of customers build long-term wealth. You will tackle sophisticated technical challenges, provide mentorship to emerging talent, and ensure our backend infrastructure remains resilient as we expand our suite of financial wellness tools.

Acorns is a remote-first organization, offering the flexibility to work remotely while providing optional access to office space in Irvine, CA.

What you will do at Acorns:

• Analyze and solve interesting business and technical challenges. You’ll dive deep into complex problems, using your experience to find elegant solutions that keep our systems running smoothly.
• Develop software architecture that stands the test of scale and time. You’ll design robust, sustainable systems that grow alongside our customers.
• Champion our customers at every turn. By approaching every architectural solution with empathy, you’ll ensure that the work we do directly improves the financial lives of the people we serve.
• Collaborate and lead with heart. You’ll partner closely with your manager and teammates to set priorities, helping us decide which new features, infrastructure improvements, and tools will have the biggest impact.
• Be a mentor and a guide. You’ll have the opportunity to support junior engineers through shorter projects, sharing your knowledge and helping them grow their technical skills and careers.
• Bridge the gap between tech and business. You’ll talk to people across the company, acting as a friendly expert who can explain complex backend concepts and help align our technical work with our big-picture mission.

What you will bring to Acorns:

• A substantial career history in software engineering, typically evidenced by 8–10 years of experience (or 5+ years with an advanced degree).
• Expert-level command of backend systems design and architectural best practices.
• Professional experience with Ruby on Rails is highly preferred (though not mandatory).
• Advanced proficiency with Postgres is highly recommended (though not mandatory).
• Experience navigating AWS environments is preferred to help us maintain a scalable cloud presence.
• Experience with TypeScript is a plus.
• Previous experience within the Financial Industry or fintech space is a plus.
• A track record of exercising sound judgment when selecting methods and techniques for solving non-routine engineering problems.
• Hunger to deliver game-changing products.
• Exceptional drive and precision in delivery.
• A belief that your work is tied to your life's mission.
• Optimistic about the potential of societal change.

What we offer:

• Competitive salary and stock options.
• A comprehensive benefits package for you and your family.
• Flexible work location, hours, and paid time off.
• 401(k) matching.
• Monthly Acorns.