Software Engineer, API Platform

Horizon3.ai

. Implement and maintain API endpoints, middleware, and platform services in Go .

Posted 10/8/2026full-timeRemote • United StatesJuniorMid-Level💰 $148,750 - $190,000 per yearWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in implementing and maintaining API endpoints and services using Go, with a strong understanding of REST API design principles and experience in containerized environments. Proficient in writing clear, reviewable code and collaborating effectively within distributed teams.

Highest-signal resume keywords

Go ProgrammingREST API DesignKubernetesDockerAPI Gateway Technologies

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

API DevelopmentGRPCOpenAPIService ReliabilityCode Testing

Soft Skills

Clear CommunicationCollaborationProblem-Solving

Tools & Technologies

KongEnvoyNGINXOAuth 2.0JWT

Industry Keywords

CybersecurityService MeshIncident ResponseSLA TrackingDistributed Systems

Tech Stack

Tools & technologies

CloudCyber SecurityDockerGRPCKubernetesNGINXGo

About the role

Key responsibilities & impact

Implement and maintain API endpoints, middleware, and platform services in Go
Build and evolve the API gateway layer, including routing, authentication, rate limiting, and request/response shaping
Write and maintain API contracts using OpenAPI and gRPC definitions
Communicate breaking API changes to internal consumers
Contribute to service reliability through monitoring, alerting, SLA tracking, and incident response for platform APIs
Write clear, reviewable code with tests covering happy paths and failure modes
Collaborate with Data Ingestion, Integrations Platform, and Client Platform teams
Help build the internal API layer connecting NodeZero services and powering customer and integration interfaces
Work on API consolidation, versioning, rate limiting, and observability
Report to the API Platform Engineering Manager

Requirements

What you’ll need

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
Solid understanding of REST API design principles and HTTP semantics
Ability to reason about latency, error rates, retry behavior, and circuit breaking
Comfort working in Kubernetes-based environments, including deploying, debugging, and understanding service interactions
Experience with containerized development workflows using Docker
Familiarity with OAuth 2.0, API keys, and JWT authentication patterns
Ability to write clear, reviewable code with meaningful tests
Ability to communicate blockers early and ask for help
Comfortable working asynchronously across a distributed team
Experience with gRPC is a plus
Experience with API gateway technologies such as Kong, Envoy, NGINX, or cloud-native equivalents is a plus
Exposure to service mesh architectures such as Istio or Linkerd is a plus
Background in cybersecurity or experience building APIs consumed by security tools is a plus
Experience with gRPC and protobuf-defined service contracts is a plus
Legally authorized to work in the United States
Up to 5% travel may be required

Benefits

Comp & perks

Stock options/equity package for all full-time roles
Health insurance for employees and family
Vision insurance for employees and family
Dental insurance for employees and family
Flexible vacation policy
Generous parental leave
Career development opportunities
Inclusive and collaborative culture
Remote and hybrid work models depending on role and location