Senior or Staff Software Engineer (full stack)
Crstl
Software Engineering
United States
USD 180k-220k / year + Equity
Posted on Apr 24, 2026
Crstl is on a mission to redefine B2B commerce! We are building the modern network that enables suppliers to seamlessly connect with retailers and marketplaces while handling the complexity of compliance, fulfillment, and invoicing behind the scenes. Crstl.ai is a Series A startup backed by Mosaic, Shopify Ventures, and Cohen Circle, led by a seasoned team from Uber, Bain, Google, and Square and has rapidly tripled in size over the past year. This is a high-impact opportunity for a Senior/Staff Engineer to play a pivotal role in shaping the platform’s future—owning architecture, scaling the retailer network, and launching new capabilities that serve a growing and diverse customer base.
Key Responsibilities
Key Responsibilities
- Design, develop, and maintain full stack applications using Node.js, Typescript, React, Google Cloud Platform (GCP), MongoDB, and Postgres.
- Contribute to platform architecture and API design, balancing sustainable technical implementation with business goals.
- Take ownership of high-priority projects and execute them independently.
- Scale systems to support a rapidly growing customer base.
- Leverage agentic AI tools (e.g., Cursor, Claude Code) throughout the development lifecycle, from brainstorming to building features.
- Own features across the full stack (backend services and associated front-end components), utilizing AI agents to accelerate development.
- Participate in code reviews and provide constructive feedback.
- Contribute to the overall availability of mission-critical customer services.
- Interact directly with customers as needed to debug engineering issues.
- Experiment with emerging technologies such as generative AI.
- Improve engineering standards, tooling, and processes.
- Mentor junior engineers.
- 8-10 years of software engineering experience. Startup scaling experience (1-to-10 stage) is strongly preferred.
- Exceptional ability to quickly learn new tools and technologies, embracing the rapidly evolving AI development landscape.
- Comfortable with agentic coding and AI-assisted development.
- Proven experience as a Backend Engineer architecting and shipping complex, high-availability systems.
- Openness to working full-stack: backend-focused yet comfortable owning front-end aspects with AI assistance.
- Demonstrates a high level of curiosity and adaptability to emerging frameworks.
- Excellent communication skills and collaborative team player in a remote-first environment.
- Proficiency in Node.js and Typescript preferred; strong Java/Go engineers are also welcomed.
- Experience with React, GCP, MongoDB, and/or Postgres is a plus.
- Ability to work independently with minimal direction while maintaining strong collaboration with a distributed team.
- East Coast time zone is strongly preferred for maximum team overlap (open to other time zones for highly independent, senior candidates).
- Willingness to travel 1-2 times per year for team on-sites.
- Competitive compensation with equity. ($180K – $220K+ depending on level, experience, and scope, with meaningful equity included.)
- Opportunity to achieve major impact and ownership in the company's success.
- Comprehensive health, dental, and vision plans.
- Flexible vacation policy.
- Remote-first company with frequent virtual team building activities.
- 401k plan (US).