Twenty - Backend Engineer
Requirements
• 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 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. • 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. Government security clearance. This role may involve work in a controlled environment.
Responsibilities
• Design and implement scalable backend services in Go that improve operator decision-making and response. • 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. • Develop and maintain automated tests to protect correctness, security, and performance as the system evolves. • Build and operate microservices deployed on AWS, with an eye toward resilience and cost-aware scaling. • Create and improve CI/CD pipelines that enable fast, secure delivery of new capabilities. • Partner with cyber operations experts to translate domain needs into robust product features. • Collaborate with frontend engineers on API contracts and data structures that are efficient and usable. • Evaluate new technologies and patterns that could unlock better operational outcomes.
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. • At the office. Commuter benefits. On-site garage parking. Bike storage. Building fitness center. Desk setup stipend. • 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. • Some positions may require eligibility to obtain a U.S. Government security clearance. Any clearance requirement will be listed in the role description.
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