Senior Full Stack Engineer
stashDenver (CO)
About the role
Want to help everyday Americans invest and build wealth? Financial inequality is increasing, and too many people are getting left behind. At Stash, we’re passionate about democratizing wealth creation through education, advice, and products that help customers achieve greater financial freedom. We also believe in working smarter—leveraging AI and emerging technologies to move faster, operate more efficiently, and focus our time on solving meaningful problems for our customers. We’re looking for a Senior Fullstack Engineer to lead our B2B efforts for the StashWorks product. StashWorks is an emerging B2B distribution channel that connects employees of partner companies with Stash products and benefits. You’ll join a small, highly collaborative team building and scaling the platform from the ground up. You’ll own projects across partner onboarding, employee eligibility and enrollment, identity and authentication, third-party integrations, lifecycle communications, and the operational tools needed to support employer partners.
What you'll do:
- 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
What we're looking for:
- 4-7 years of professional experience building software
- Proven hands-on experience with AI tools (e.g., Cursor, ChatGPT, etc.) as a core part of daily workflows, driving productivity and enhancing output quality, alongside a commitment to continuously developing AI expertise
- Thrives in ambiguous, early-stage environments
- Can move comfortably across services and codebases
- Writes pragmatic, maintainable GoHas experience designing APIs and integrating external systems
- Understands production operations, observability, security, and reliability
- Works effectively with product, operations, marketing, and partner-facing teams
- Balances shipping quickly with building systems that can scale
- Gold Stars: Experience building applications at scale
- Familiarity with or interest in Consul, multi-region systems, multi-cloud design
- Familiarity with or interest in other areas of our stack including Spinnaker, CI/CD pipelines, Nginx, TypeScript, React, Node.js, Postgres, SNS/SQS, AWS
Before you apply
Applying takes about a minute. These four things decide how fast it moves after that.
Your profile is current
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Two examples you can talk through
Not a portfolio — just two pieces of work where you can explain the decisions and what you'd change.
A number in mind
What you're on now and what would make you move. We negotiate better when we know both.
Your notice period
Employers plan around it, and it's the question that stalls offers most often.
Once you apply, someone reads it and calls you before anything reaches the employer — usually within two working days.