Senior Staff Software Engineer

EarnIn•Mountain View, CA

2d•Hybrid

About The Position

EarnIn is seeking an experienced, resourceful Senior Staff Software Engineer to join its product engineering team and work cross-functionally on the design and development of core products. The role owns architecture spanning business units, including defining domain boundaries, locating cross-cutting concerns, and ensuring product logic, policy, and funds flow remain in appropriate layers. It leads architecture reviews, documents decisions, and drives roadmaps to decompose and unify shared systems in ways teams can adopt incrementally. The engineer partners with Platform, Money Platform, and business-unit engineering leads to establish practical, adopted standards. The role also makes deprecation, experiment cleanup, and clear ownership part of system design; uses AI tools for design, code analysis, and review; and builds agents, skills, and documentation that help engineers and AI coding agents understand the architecture. It sets practices and guardrails for responsible AI-assisted development, mentors Staff and Senior engineers, contributes to hiring and onboarding, and represents engineering in technical discussions with product, risk, and leadership. This is a full-time hybrid position based in Mountain View, requiring two days of in-office work per week. The listed Mountain View base salary range is $279,000–$341,000, plus equity and benefits.

Requirements

Bachelor’s, Master’s, or PhD in computer science, computer engineering, or a related technical discipline, or equivalent industry experience.
10+ years of backend or full-stack software development experience.
Track record of designing and evolving large distributed systems.
Demonstrated experience defining domain boundaries and service contracts across multiple teams.
Practical knowledge of domain-driven design, event-driven systems, and clean architecture.
Hands-on, daily use of AI coding and design tools, with concrete examples of their impact on work and results.
Experience leading cross-team technical initiatives and influencing without direct authority, including resolving disagreements between teams.
Excellent written and verbal communication, including the ability to explain complex trade-offs through clear decisions and documentation.
Ability to thrive in a fast-paced, dynamic, results-driven environment.

Nice To Haves

Experience in fintech, payments, or other regulated, high-reliability environments.

Responsibilities

Own architecture spanning business units, defining domain boundaries and deciding where cross-cutting concerns belong.
Keep product logic, policy, and funds flow in the appropriate architectural layers.
Lead design and architecture reviews across business units and document decisions in durable architecture decision records.
Drive decomposition and unification roadmaps for shared systems, including how user state is split across domains, and sequence work for incremental adoption.
Build deprecation, experiment cleanup, and clear ownership into system designs to prevent accumulated complexity.
Partner with Platform, Money Platform, and business-unit engineering leads to develop practical standards that are adopted and not duplicated.
Use AI tools daily for design exploration, code analysis, and review, and build agents, skills, and documentation that make architecture legible to engineers and AI coding agents.
Establish guardrails, review practices, and patterns for responsible AI-assisted development and architecturally consistent AI-generated code.
Mentor Staff and Senior engineers through design reviews, code, and architecture guidance, and raise the technical bar across teams.
Contribute to hiring and onboarding.
Represent engineering in technical discussions with product, risk, and leadership.