Senior Software Engineer, Full-stack

Consequential Work. Dedicated People.

About Onebrief

Onebrief builds collaboration and AI-powered workflow software for military planning and operational coordination.

Military planning is complex by nature, requiring teams to coordinate information, people, and decisions across systems and locations. Onebrief brings planning, collaboration, simulation, and AI into one connected environment, helping teams test strategies, adapt to changing conditions, and make decisions with greater clarity when the stakes are real.

We are a distributed team of builders from military, operational, and technology backgrounds who care deeply about improving how important work gets done. Some team members work remotely, while others work directly alongside customers in operational environments around the world.

Founded in 2019, Onebrief is backed by leading investors including General Catalyst, Battery Ventures, Insight Partners, Sapphire Ventures, and Human Capital. Valued at more than $2 billion, we continue to invest in product innovation, AI capabilities, and team growth.

Engineering at Onebrief

Engineering at Onebrief means building systems that must perform reliably in complex, high-stakes environments where operational outcomes matter more than activity, output, or elegant theory alone.

This is work for engineers who care about reliability, adaptability, observability, and building systems that succeed under real-world conditions. As AI transforms how software is built, engineering here is increasingly focused on verification, judgment, and helping teams operate more effectively at scale.

You’ll likely feel energized here if you care about:

• meaningful technical challenges

• systems that operate under real-world constraints

• outcomes over activity

• and grounded teams focused on solving important problems well.

Why This Role Exists

Onebrief builds software for military planning, where the cost of a slow or wrong decision is measured in something more than a missed sprint. That raises the bar on the engineering itself. The systems have to hold up under real operational load, in environments where the customer can't tolerate failures or downtime.

A Senior Software Engineer owns the hard parts of that. Not just shipping features, but taking the ambiguous, high-stakes pieces of a system and driving them to something that holds: designing for the failure cases, making the tradeoffs that keep the code maintainable as it grows, and lifting the quality bar for the squad along the way. This is the level where an engineer stops needing the problem handed to them fully framed and starts framing it themselves.

Onebrief is building in the AI-native era, and Senior engineers here are expected to use these tools well: knowing what to trust to them, where human judgment stays non-negotiable, and how to keep quality and ownership intact as the leverage goes up.

What You'll Do

• Own end-to-end delivery of features and systems that directly impact customers, contributing across the full stack from frontend experiences to backend services and infrastructure.

• Move between squads as business priorities evolve, applying your expertise to high-impact problems and quickly becoming effective in new domains.

• Improve the scalability, reliability, and security of Onebrief's core platform by evolving shared systems, architecture, and engineering foundations.

• Partner with engineers across the organization to shape technical decisions that balance long-term platform health with rapid customer delivery.

• Help define how AI-assisted development is used at Onebrief, leveraging modern tooling to accelerate development while maintaining high standards for quality and maintainability.

• Drive meaningful outcomes by solving the problems that matter most, making thoughtful tradeoffs that enable the team to move quickly without sacrificing engineering excellence..

What We Look For

• 6+ years of software engineering experience or equivalent practical experience.

• Strong experience designing distributed systems, APIs (REST, GraphQL, or gRPC), and scalable data models.

• Hands-on experience building and operating cloud-native applications using technologies such as Docker, Kubernetes, and AWS, GCP, or Azure.

• Proven ability to work across the stack, from frontend applications to backend services and infrastructure.

• Experience delivering complex technical projects in fast-paced, evolving environments.

• Strong communication skills with the ability to explain technical decisions and collaborate effectively across engineering teams.

Nice to Have

• Experience with observability, monitoring, and incident response.

• Background in mission-critical or regulated environments (FedRAMP, SOC 2, HIPAA, or DoD).

• Experience with event-driven architectures and distributed messaging systems.

• Familiarity with authentication and identity systems (OAuth 2.0, OIDC, SAML, or RBAC/ABAC).

Tools, Systems & Technologies

• Frontend: React, TypeScript, Vite, shared component libraries, client-side observability

• Backend: Node.js, PostgreSQL, Redis, secure RESTful APIs, distributed services

• Authentication & Authorization: Keycloak, OpenID Connect (OIDC), SAML 2.0, OAuth 2.0, ABAC, JWT, federated identity provider integrations

• Infrastructure: Kubernetes, AWS, Terraform, CI/CD pipelines, container security and secrets management

• Integrations: CSV/Excel/KML importers, PDF exports, DoD and enterprise data systems, secure API gateways, auditing pipelines

Notice to Third Party Recruitment Agencies
Please note that Onebrief does not accept unsolicited resumes from recruiters or employment agencies. In the absence of an executed Recruitment Services Agreement, there will be no obligation to any referral compensation or recruiter fee. In the event a recruiter or agency submits a resume or candidate without an agreement Onebrief explicitly reserves the right to pursue and hire those candidate(s) without any financial obligation to the recruiter or agency. Any unsolicited resumes, including those submitted to hiring managers, shall be deemed the property of Onebrief.