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Software Engineer, API Platform

Horizon3 AI· Engineering
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Remote$148.8k - $190k + equityFull-timePosted 1w ago

About the role

Software Engineer on the API Platform team responsible for building the internal API layer that connects NodeZero services, shaping gateway and API contracts, and improving reliability, latency, and developer experience across the platform.

Responsibilities

  • Implement and maintain API endpoints, middleware, and platform services in Go
  • Build and evolve the API gateway layer — routing, authentication, rate limiting, and request/response shaping
  • Write and maintain API contracts (OpenAPI/gRPC definitions) and communicate breaking changes to internal consumers
  • Contribute to service reliability: monitoring, alerting, SLA tracking, and incident response for platform APIs
  • Write clear, reviewable code with tests that cover both the happy path and failure modes
  • Collaborate with Data Ingestion, Integrations Platform, and Client Platform teams who consume the APIs you build

Qualifications

  • 2+ years of professional software engineering experience building production backend services
  • Proficiency in Python or strong motivation to ramp quickly — Python is the primary language on this team
  • Solid understanding of GraphQL API design principles and HTTP semantics; experience with gRPC is a plus
  • Ability to reason about service reliability: latency, error rates, retry behavior, and circuit breaking
  • Comfort working in Kubernetes-based environments — deploying, debugging, and understanding how services interact
  • Experience with containerized development workflows (Docker)
  • Familiarity with API authentication patterns (OAuth 2.0, API keys, JWT)
  • You write code that your teammates can read and review without decoding — clear naming, small functions, meaningful tests
  • You communicate blockers early and ask for help without prompting
  • Comfortable working asynchronously across a distributed team

Skills

Required:Backend engineeringPythonGraphQLKubernetesDocker
Nice to have:GogRPCOAuth 2.0

Benefits

  • Health, vision & dental insurance for you and your family
  • Flexible vacation policy
  • Generous parental leave
  • Competitive salary with equity package
  • Hybrid & Remote Work options
Last updated Oct 22, 2026. Interested? Apply on the company site.

About Horizon3 AI

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Continuously assess, fix, and verify your security posture. Securing enterprises across many attack surfaces.

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