Senior Backend Engineer - API Platform

kastel group United State
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AI Summary

Design and develop a core GraphQL API for external customers, evolve mortgage domain models, and contribute to an event-driven architecture. Collaborate with SMEs and customers to iterate on API design. Develop and maintain a production-grade GraphQL API.

Key Highlights
Design and develop a core GraphQL API
Evolve mortgage domain models
Contribute to event-driven architecture
Key Responsibilities
Define and evolve mortgage domain models in code with forward-looking scalability
Design, build, and maintain a core GraphQL API used by external customers
Contribute to an event-driven architecture that communicates system actions and outcomes
Technical Skills Required
TypeScript GraphQL Temporal
Benefits & Perks
Salary: $140K - $250K
Equity: 0.05% - 0.17%
Visa sponsorship available
Nice to Have
Non-traditional path into engineering
Strong product intuition and customer empathy

Job Description



About the Company



Senior Back End Engineer – API Platform



About the Role



Compensation & Benefits



  • Salary: $140K – $250K
  • Equity: 0.05% – 0.17%
  • Visa sponsorship available (including new H1B applications)


Responsibilities



  • Define and evolve mortgage domain models in code with forward-looking scalability
  • Design, build, and maintain a core GraphQL API used by external customers
  • Contribute to an event-driven architecture that communicates system actions and outcomes
  • Create clear abstractions and documentation to simplify complex workflows
  • Collaborate closely with SMEs and customers to iterate on API design
  • Own full API lifecycle:
  • Versioning
  • Managing breaking changes
  • Developer onboarding

  • Qualifications



    • Education: Bachelor’s degree from a top-tier institution (e.g., MIT, Waterloo)


    Required Skills



    • Professional experience building backend services with TypeScript
    • Proven track record designing and deploying production-grade GraphQL APIs
    • Experience with workflow orchestration tools (e.g., Temporal)


    Preferred Skills



    • Non-traditional path into engineering (e.g., career switchers, founders, self-taught builders)
    • Strong product intuition and customer empathy


    Pay range and compensation package



    • Salary: $140K – $250K
    • Equity: 0.05% – 0.17%
    • Visa sponsorship available (including new H1B applications)


    Equal Opportunity Statement



    We are committed to diversity and inclusivity.



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