Staff Engineer

At Stash
  • Full Time
  • Employee
  • Full Remote (with restrictions)

Posted on September 19th

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Want to help everyday Americans build wealth? Financial inequality is increasing and too many people are getting left behind. At Stash, we believe in the power of simplifying investing, making it easy and affordable for everyday Americans to build wealth and achieve their financial goals.

We’re one of the fastest growing fintechs in the U.S. and have had another record-breaking year. In 2021 we almost doubled our headcount and valuation. Our personal finance app makes investing easy and affordable; this year 6 million customers set aside more than $3 billion with Stash.

Prioritizing People is one of our core values and has been key to a healthy work-life balance and a great sense of fulfillment and inclusion. We employ a true people first - hybrid model. Live and work where you feel the most productive, whether that is in your home, in an office, or a combination of both. Anywhere in the US or UK.  

Let’s solve complex problems and tackle wealth inequality.

Stash is looking for software engineers with a passion for building reliable, scalable, and performant software to power the Stash experience.

At Stash we use a variety of different languages, frameworks, tools, and vendors to accomplish our goals. We use the right tool for the job when it comes to reaching for tech that will solve whatever challenge we're facing. Stronger versus more relaxed type system and type checking, functional versus procedural programming, etc. We make deliberate decisions that we feel will help our platform grow and mature and support more and more customers.

Our technology stack features languages like Ruby, Scala, JavaScript, Swift, Kotlin, Go, and Lua. Hand in hand with Ruby is the Rails framework which has allowed us to move quickly in both the early days and with a lot of the newer things we are currently building. We also write a lot of backend code in Scala - for these projects we like to leverage Akka HTTP. Most of the time we reach for a relational database like Postgres to store data, and we rely upon Redis as a cache. We're big fans of Terraform and Kubernetes, too.

We hire the best engineers regardless of programming language or background. We have invested (and continue to invest) in our onboarding process, so even if you join with no experience in our tech stack, you’ll have the time and space to learn.  We consider Stash a learning organization and work hard to allow Engineers the time and the space to learn and grow.   We encourage tech experimentation and continuous improvement.

We look for strategic thinkers and creative problem solvers with a bias for execution and we’ll expect you to contribute code as well as product/feature ideas from the get-go.

We’ve had tremendous growth in the past few years and have an exciting roadmap ahead of us.  If you’re interested in solving complex problems associated with scaling a popular consumer facing application and working in an open, diverse, and inclusive environment, then we think Stash is the right fit for you!

We’re hiring a Staff Engineer who will report to the Trust team’s Engineering Manager and partner with Stash security and anti-fraud teams. This team owns Stash’s OAuth2-based Authentication and Access systems– consumer-friendly services which provide secure access for account creation and sign-in. This team obsesses over the customer experience and continually improves success rates based on evidence-based research and feedback. This is a Ruby tech stack.

What you'll do:
  • Architect, design and implement backend services to solve customer problems
  • Own the end-to-end delivery of software from inception to production
  • Incrementally produce full stack software as part of a multi-functional, agile team
  • Work with engineers, product managers, designers, and data scientists to build a world-class customer experience through incremental, agile delivery
  • Define technical vision through collaboration with engineers across multiple teams
  • Provide guidance, feedback, education and mentoring to other engineers
  • Continuously deploy to our cloud-based infrastructure
  • Scale software infrastructure for a quickly-growing customer base

What we're looking for:
  • 8+ years of professional experience building consumer-facing software
  • An experienced engineer who can turn ideas into reliable code that others find easy to understand and modify
  • Experience building RESTful APIs
  • A passion for automated testing, debugging, and maintaining a high bar for code quality
  • A passion for operational excellence: DataDog or similar observability, metrics, monitors, and alarms tuned for high availability and a sustainable operational posture
  • Creative problem solver with a passion for testing, debugging, and overall code quality
  • Data-driven decision maker, willing to take risks, fail fast, learn, and iterate quickly
  • TDD and pairing experience are pluses!

Gold Stars:
  • Experience working with OAuth 2.0 flows, Role-Based Access Control (RBAC), Authentication and Authorization concepts
  • Experience building an application at internet scale
  • Experience with distributed systems, including transitioning monolithic systems to microservices
  • Experience with event-based architectures
  • Familiarity with or interest in our stack: Ruby on Rails, Postgres, Redis, AWS, Kubernetes, Spinnaker, GitHub Actions, CircleCI, Nginx
  • Familiarity with web development frameworks such as React.js


At Stash it is our mission to help everyday Americans invest and build wealth. That includes people of all races,  genders, and abilities, so it is important to us to acknowledge and address the issues of inequality in financial services head on. 

Diversity and inclusion are essential to living our values, promoting innovation, and building the best products. Our success is directly related to our employees and we believe that our team should reflect the diversity of the customers that we serve.  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

Invest in Yourself: 
  • Equity & Stash Accounts [Invest, Retire, Custodial, Bank]                     
  • Flexible PTO 
  • Learning & Development Fund 
  • Work from Home Stipends
  • Parental Leave [Primary & Secondary]

  • BuiltIn’s Best Places to Work (2019, 2020, 2021) 
  • Forbes Fintech 50 (2019, 2020, 2021)
  • Best Digital Bank, Finovate Awards (2020)
  • Tearsheet Challenge Awards, Best Banking Card Product - Stock-Back® Card, 2020
  • LendIt Fintech Innovator of the Year (2019 & 2020)

**No recruiters, please**

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