Senior Backend Software Engineer

You care about building systems that have real-world impact, especially in national security and defense of democracies.

You’re excited by hard backend problems: throughput, latency, correctness, and operability under pressure.

You take pride in clean interfaces—APIs that are intuitive, consistent, and built to evolve.

You think in systems: data models, services, and workflows that work together reliably.

You’re pragmatic and iterative—ship value quickly, then harden, measure, and improve.

You collaborate well across disciplines, communicate clearly, and welcome direct feedback.

You default to ownership: you notice gaps, propose solutions, and drive them to completion.

You’ve delivered software in defense, security, or other mission-critical environments.

You’ve built systems for analysts, operators, or high-tempo users where speed and reliability matter.

You’ve integrated AI/ML capabilities into production systems (inference, pipelines, or tooling).

You have experience with large-scale data processing and analytics workloads.

You’ve contributed meaningfully to open-source projects.

You’ve used observability tooling (metrics, tracing, logging) to debug and improve production systems.

Go (Golang), GraphQL/REST

Graph databases (Neo4j, AWS Neptune) and complex graph schemas

NATS and event-driven architectures

AWS, microservices, containers

CI/CD pipelines, automated testing frameworks, infrastructure-as-code patterns

Monitoring and observability tools

Benefits What's on the table:

Health. Medical, dental, and vision plan options. Life / AD&D, disability coverage options.

Family. Paid parental leave for eligible full-time employees. 12 weeks for birthing parents, 4 for non-birthing parents, 6 weeks for adoptive, foster, or intended parents through surrogacy.

Vacation. Paid holidays and flexible PTO. Take what you need.

Retirement. 401(k) with pre-tax and Roth options. HSA/FSA options, dependent care FSA.

Benefits vary by location, role, and eligibility. Full plan details provided during the interview and offer process.

If this role sounds like you, apply and share with us your interest

Due to U.S. government contract and security requirements, this role is limited to U.S. citizens. Some positions may also require eligibility to obtain and maintain a U.S. Government security clearance. Any active clearance requirement will be listed in the role description.

Twenty is an equal opportunity employer. We consider all qualified applicants without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, veteran status, disability, or any other protected status, consistent with applicable law.

If you need a reasonable accommodation during the hiring process, let us know and we will work with you.