engineering
Posted Oct 12, 2025Backend Engineer
at Twenty
On-site
Responsibilities
- - Build high-performance APIs that power customer-facing workflows and internal platform capabilities.
- - Model complex relationships in graph databases and optimize schemas and queries for speed and clarity.
- - Implement event-driven systems (e.g., with NATS) to process real-time operational data streams.
- - Create and improve CI/CD pipelines that enable fast, secure delivery of new capabilities.
- - Collaborate with frontend engineers on API contracts and data structures that are efficient and usable.
Requirements
- You’ll design and ship reliable services in Go, working with known-hard problems like graph data modeling, event-driven architectures, and performance at scale.
- WHAT YOU’LL DO - Design and implement scalable backend services in Go that improve operator decision-making and response.
- - Build and operate microservices deployed on AWS, with an eye toward resilience and cost-aware scaling.
- MUST HAVE - You have 3+ years of professional software development
- experience building backend (or full-stack) applications. - You have strong proficiency with Go (Golang) and have shipped production services with it. - You have
- experience working with graph databases (Neo4j, AWS Neptune, or similar), including schema design and query performance. - You have working knowledge of event-driven architectures and message queues/streaming systems. - You have
- experience building and maintaining APIs (REST and/or GraphQL). - You have
- experience with cloud infrastructure, ideally AWS, and understand cloud-native deployment patterns. - You have hands-on
- experience with containerization and microservices architectures. - You have a strong foundation in secure coding practices and can reason about security tradeoffs. - You have a bachelor’s degree in Computer Science, Software Engineering, or a related field, or equivalent practical experience.
- NICE TO HAVE - 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.
- TECH ENVIRONMENT (YOU MIGHT WORK WITH) - 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 SECURITY / WORK ENVIRONMENT Some positions may require eligibility to obtain and maintain a U.S.
- Some positions may require eligibility to obtain a U.S.
Benefits
- Twenty was founded to change that, by making our adversaries think twice before they attack us. Our vision is American and allied primacy in cyberspace—a future where they cannot contest us, deterrence is assured, and the free world remains secure.
- 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.
- Building fitness center. Desk setup stipend.
Contact
- Founded in 2024, Twenty Technologies (www.twenty.io http://www.twenty.io) industrializes offensive cyber operations for the U.S. and its allies.
Additional details
- ABOUT THE COMPANY America is under sustained cyber attack.
- Our adversaries infiltrate our networks, steal our IP, and degrade the digital infrastructure that modern life runs on.
- They’ve learned—correctly—that those attacks rarely produce consequences.
- Headquartered in Arlington, Virginia, Twenty has raised $38M from Caffeinated Capital, General Catalyst, and In-Q-Tel.
- ROLE SUMMARY You’ll build the backend systems that power Twenty’s cyber and electromagnetic capabilities—software that ingests real-time operational signals, models complex relationships, and serves high-throughput APIs at machine speed.
- You’ll partner closely with product, frontend, and domain experts to turn operator needs into durable platform capabilities.
- This role spans both cloud and on-premises environments supporting mission-critical U.S. national security outcomes.
- WHO YOU ARE - 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.