Senior Engineer, Retirement Financial Platform

Gusto; Seattle (WA); Hybrid; USD 163,000 - 247,000; Full time

Job summary

Gusto is seeking a senior software engineer to own backend services and APIs for money movement and financial integrations within Gusto Retirement. This hands-on role requires shipping production code and solving complex edge cases, collaborating with product, compliance, and operations.

You will mentor engineers, design reliable systems at scale, and write clear, well-tested code. The team focuses on payments, settlements, tax, and integrations, offering a growth path in a fast-moving fintech

Qualifications

• 8+ years of software engineering experience building and shipping production products or platforms.
• Strong experience with services, APIs, and data-heavy workflows.
• Experience working on financial systems, payments, or other high-correctness domains.
• Comfortable owning systems end-to-end, including production support and operational work.
• Experience working closely with PMs and cross-functional partners to deliver scoped work.
• Pragmatic, execution-focused approach to engineering.
• Clear communicator and collaborative teammate.
• Ability to mentor engineers to maximize their performance and impact
• Experience with Ruby on Rails (or a comparable backend framework).

Responsibilities

• Design, build, and ship services and APIs for money movement and financial integrations
• Work on payments, settlements, reconciliation, and corrections involving real customer funds
• Build and support critical workflows like payroll integration, KYB/KYC, 401k loans, billing and invoicing, and IRA
• Partner with product, compliance, and operations to scope work and deliver production-ready solutions
• Debug production issues and improve reliability, observability, and operational tooling
• Collaborate with other engineering teams to integrate with shared systems and platforms
• Mentor other engineers to help solve some of the hardest technical problems out there in very complex domains and at a large scale
• Write clear, reliable, well-tested code that ships quickly and scales well
• Build a product that our customers genuinely love

Skills

Senior software engineer

Services & APIs

Data-heavy workflows

Financial systems/payments

End-to-end ownership

cross-functional collaboration

Mentoring engineers

Ruby on Rails

Tools

Ruby on Rails

Job description

Gusto is seeking a senior software engineer to own backend services and APIs for money movement and financial integrations within Gusto Retirement. This hands-on role requires shipping production code and solving complex edge cases, collaborating with product, compliance, and operations.

You will mentor engineers, design reliable systems at scale, and write clear, well-tested code. The team focuses on payments, settlements, tax, and integrations, offering a growth path in a fast-moving fintech