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Sr. Software Engineer – API & Auth Platform

Betterment· Platform Engineering
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Hybrid (New York City, NY)$170k - $195kFull-timePosted 3w ago

About the role

Senior engineer role focused on building and maintaining Betterment's API, authentication, and internal tooling platform, with emphasis on GraphQL frameworks, security, AI tooling readiness, and collaboration with product, operations, and compliance.

Responsibilities

  • Work with a team of senior/staff engineers building the API, authentication, and internal tooling foundation that every Betterment team relies on.
  • Help deliver the GraphQL API frameworks powering our customer-facing and internal apps, including agentic tooling for AI-native API development workflows.
  • Contribute to Betterment's authentication and authorization systems, keeping them current with industry best practices.
  • Build platform capabilities like secure, first-party MCP access to Betterment APIs — and the reliability, security, and developer experience work that makes them trustworthy.
  • Embed with the product teams who build on your platform every day. Develop broad Betterment domain expertise in the process.
  • Help make the standards that keep shared systems healthy visible and easy to meet, and help teams understand the "why" behind them.
  • Participate in efficient, blameless incident response across your team and the teams building on the API platform. Invest in observability that serves both developers and internal tool users.
  • Mentor junior engineers, sharing your experience to expand their impact and accelerate their growth.

Qualifications

  • A contributor capable of working in sensitive auth systems, working alongside senior and staff IC colleagues to shaping their technical direction.
  • Experience building on or contributing to a shared API platform — ideally GraphQL — with an appreciation for the frameworks, conventions, and developer tooling that let product teams introduce new capabilities, support existing usage, and gracefully retire legacy functionality.
  • Experience with modern authentication/authorization patterns (OAuth 2.0, OIDC, passkeys), with an appreciation for the importance of adoption, long-term support, and security testing.
  • Experience operating systems in production that other engineering teams depend on, with an eye for observability, testing, and safe rollout.
  • Comfort with the evolving AI landscape — using AI tooling in your own workflow and thinking clearly about how AI agents should access APIs safely.
  • Fullstack development experience including GraphQL and one or more server-side languages (Ruby, Java, TypeScript, C#, Python, etc.)
  • Experience collaborating across discipline and team boundaries.
  • An open-minded approach when navigating the tension between moving fast, customer quality, and regulatory requirements.

Skills

Required:GraphQLAuthentication/AuthorizationObservabilityFullstack development

Benefits

  • We offer a competitive suite of benefits, including medical, dental, and vision coverage; life and AD&D insurance; short- and long-term disability; infertility support and WPATH-aligned transgender health benefits; an Employee Assistance Program (EAP); transit benefits and FSA and HSA options
  • Ownership: Equity for all employees, including new hire and refresher grants.
  • Time: Flexible paid time off, paid parental leave, and a fully paid four-week sabbatical in your sixth year.
  • Growth: Company-paid professional coaching for all employees.
  • Wealth: Day-one 401(k) match plus matching on qualified student loan payments.
Last updated Sep 30, 2026. Interested? Apply on the company site.

About Betterment

Automated investing & Financial planning

Betterment can help grow your money by making saving and investing easy. Invest in a tailored portfolio, set buckets for your goals, and earn rewards.

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