Senior Fullstack Engineer

Stash • New York, NY

18h • Hybrid

About The Position

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, StashWorks plays a critical role in bringing modern, accessible fintech solutions to the workplace. At Stash, we are passionate about democratizing wealth creation, and StashWorks extends that mission to employers and their workforces.
We’re looking for a Senior Fullstack Engineer to lead our B2B efforts for the StashWorks product. StashWorks 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 StashWorks 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.

Requirements

• 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

Nice To Haves

• 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, TypeScript, React, Node.js, Postgres, SNS/SQS, Kafka, Kubernetes, AWS

Responsibilities

• 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

Benefits

• 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 parents) Primary & Secondary
• Enhanced health and wellness benefits through One Medical, Gympass, and Maven Health

What This Job Offers

• Job Type: Full-time
• Career Level: Mid Level
• Education Level: No Education Listed