What You'll Do

The Software Engineer on the API Platform team helps build the internal API layer that connects NodeZero's services and powers the interfaces that customers and integrations rely on. API Platform owns the gateway, the API contracts, and the shared platform capabilities that other teams consume — your work directly determines the reliability, latency, and developer experience of NodeZero's service mesh.

You'll join a small team anchored by a P5 technical lead and a P4 senior engineer, shipping against a roadmap that includes API consolidation, versioning, rate limiting, and observability. This role reports to the API Platform Engineering Manager.

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

What You'll Bring

Backend Engineering

• 2+ years of professional software engineering experience building production backend services

• Proficiency in Go or strong motivation to ramp quickly — Go is the primary language on this team

• Solid understanding of REST 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

Platform Fundamentals

• 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)

Craft & Collaboration

• 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

Nice to Haves

• Experience with API gateway technologies (Kong, Envoy, NGINX, or cloud-native equivalents)

• Exposure to service mesh architectures (Istio, Linkerd)

• Background in cybersecurity or experience building APIs consumed by security tools

• Experience with gRPC and protobuf-defined service contracts

Travel Required

We are a fully remote company, and this job may require up to 5% of travel to be successful.

In accordance with various State's transparency regulations, we provide the following salary range information for this position:

• Base salary range: $148,750 - $190,000 annually. The exact salary will be determined based on the selected candidate's location, qualifications, experience, and relevant skills.

Perks of Horizon3

• Inclusive Team: We value diversity and promote an inclusive culture where everyone can thrive.

You Belong Here

Horizon3 is not just an equal opportunity employer - we are a community that values diversity, equity, and inclusion as fundamental principles of our culture and success. We are dedicated to fostering a workplace where everyone feels welcome and respected, regardless of race, color, religion, sex, national origin, age, disability, veteran status, sexual orientation, gender identity or expression, genetic information, marital status, or any other legally protected status by law.