Senior Fullstack Engineer

Want to help employers deliver meaningful financial wellness benefits to their teams? As companies look for better ways to support their employees’ financial health and reduce the negative impacts of financial stress on productivity, Stash Works plays a critical role in bringing modern, accessible fintech solutions to the workplace. At Stash, we are passionate about democratizing wealth creation, and Stash Works extends that mission to employers and their work forces.

We’re looking for a Senior Fullstack Engineer to lead our B2B efforts for the Stash Works product. Stash Works is an existing platform with a small but growing set of clients, and this role will be responsible for evolving the product, scaling its capabilities, and driving its next phase of development. You will own the overall product roadmap while partnering closely with our Stash Works General Manager (GM) to support sales cycles and expand our employer footprint.

You’ll operate at the intersection of product strategy, fintech, and go-to-market execution — refining a live product, incorporating real customer feedback, and balancing near-term commercial needs with long-term platform maturity.

Stash is aggressively retooling into an AI-first engineering culture, and you will be at the forefront of that transition. We expect you to be a trailblazer, heavily leveraging tools like Cursor, Opus, and GPT to accelerate the 'easy 80%' so you can focus your brainpower on architecture, security, and strategy. You won't just be building a product; you will be helping us define the modern way to ship it.

• Act as an "Agent Conductor" to architect, design, and rapidly implement services by leveraging AI coding assistants.
• Own the end to end delivery of software from inception to production.
• Instrument, test, profile, and code review software.
• Continuously deploy to our cloud-based infrastructure.
• Scale software infrastructure for a quickly-growing user base.

• 4-7 years of professional experience building software.
• An engineer who can turn strategy into reliable code at lightning speed using AI, ensuring the output is secure, scalable, and easy to modify.
• Experience building backend APIs and services in a highly collaborative team setting.
• Creative problem solver with a passion for testing, debugging, and overall code quality.
• Experience with event‑based architectures.
• Familiarity with or interest in Docker, AWS, Terraform, Datadog.
• Data‑driven decision maker, willing to take risks, fail fast, and iterate at the speed of AI generation.
• A keen understanding of testing best practices.
• Familiarity with Ruby, Go.

• Experience building applications at scale.
• Familiarity with or interest in Kubernetes, Consul, multi‑region systems, multi‑cloud design.
• Familiarity with or interest in other areas of our stack including Spinnaker, CI/CD pipelines, Nginx, Type Script, React, Node.js, Postgres, SNS/SQS, Kafka, Kubernetes, AWS.

We proudly celebrate the unique qualities that make you you, 365 days a year, and not just because it’s the right thing to do or good for business. We embed the principles and practices of diversity, equity, and inclusion (DEI) into all that we do to prioritize people, a Stash core value, and to ensure Stashers of all backgrounds and experiences can be their authentic selves.

We are also proud to be the first and only venture‑backed fintech to join the CEO Action for Diversity & Inclusion, and as an Equal Opportunity Employer, Stash is committed to building an inclusive environment for people of all backgrounds. If you require any reasonable accommodations to make your application process more accessible, please reach out to

• Comprehensive total rewards package, comprising compensation (salary and equity) and health care benefits.
• Complimentary subscription to Stash+ account.
• Remote‑first work policy – Live and work where you feel the most productive, whether that is in your home, in an office.
• Flexible PTO.
• Work‑from‑home equipment stipends; home internet subsidy.
• Paid Parental Leave (offerings for birth‑giving and non‑birth‑giving…