Software Engineer, Horizon3
API Platform
$148.8-190k
+ Stock options
Autonomous security solutions
Be an early applicant
Autonomous security solutions
201-500 employees
Be an early applicant
$148.8-190k
+ Stock options
201-500 employees
Company mission
To help find and fix attack vectors before attackers can exploit them.
Role
Who you are
- 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
- 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
Desirable
- 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
What the job involves
- 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
- 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
Our take
In an era marked by escalating cyber threats and data breaches, safeguarding digital assets has become a high priority across all industries. Amid this landscape, Horizon3.ai stands out as an autonomous security solution by addressing the critical need for robust cybersecurity.
At the heart of Horizon3.ai's mission is NodeZero™, a platform designed to elevate proactive security measures. Using this, customers can verify their security posture and identify potential vulnerabilities through self-service. This proactive approach to cybersecurity effectively thwarts potential exploits and ensures the integrity of their digital infrastructure.
With 2025 funding in hand, the company is poised to further its ambition to develop into an industry-leading cybersecurity company. The infusion of funds will be channelled towards expanding its partner network, refining its offerings and entering the US government market. Horizon3 aims to establish itself as a pivotal player in the evolving autonomous security landscape, a highly lucrative market valued at $80 billion.
Kirsty
Company Specialist at Welcome to the Jungle
Insights
-8% employee growth in 12 months
Company
Funding (last 2 of 6 rounds)
Jun 2025
$100m
SERIES D
Aug 2023
$40m
SERIES C
Total funding: $187m
Company benefits
- Growth Opportunities: Be part of a dynamic and growing team with numerous career advancement opportunities
- Innovation-Driven Culture: Work in a collaborative environment that encourages creativity and out-of-the-box thinking
- Flexible Work Environment: Enjoy the convenience and work-life balance that comes with remote work
- Inclusive and Diverse Team: We value diversity and promote an inclusive culture where everyone can thrive
Company HQ
SoMa, San Francisco, CA
Leadership
Snehal Antani
(Co-Founder & CEO)Graduated from the Rensselaer Polytechnic Institute with an MS in Computer Science. Previously worked at IBM as a Lead Architect, at GE Capital as the CIO of Distribution Finance and Splunk as the SVP & GM of Business Analytics & IoT.
Anthony Pillitiere
(Co-Founder)Graduated from the University of Maryland with a Bachelor's Degree in Computer Systems Networking and Telecommunications. Previously worked at the United States Air Force in multiple roles, including Deputy Chief Technology Officer.
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