Backend Engineer jobs in United States
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Twenty · 6 hours ago

Backend Engineer

positionWashington, DC
timeContract
remoteOnsite
seniorityMid Level
date3+ years exp

Twenty is a company focused on defending democracies in the digital age through revolutionary technologies. The Backend Engineer will build backend systems that power cyber and electromagnetic capabilities, focusing on high-performance APIs and complex data modeling to support national security outcomes.

Cyber SecurityMilitarySoftware
badNo H1BnoteSecurity Clearance Requirednote
Hiring Manager
Santiago Medina-Saenz
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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

Qualification

Go (Golang)Graph databasesEvent-driven architecturesAPIs (REST/GraphQL)AWSMicroservices architecturesContainerizationAutomated testingCI/CD pipelinesSecure coding practicesCollaborationCommunicationOwnership

Required

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

Preferred

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

Company

Twenty

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We apply world-class software engineering to a warfighting domain of persistent conflict.
dateFounded in 2024
location
Arlington, Virginia, USA
people-size11-50 employees
web-link
https://twenty.io

Funding

Current Stage
Early Stage
Total Funding
$38M
Key Investors
Caffeinated Capital
2025-11-20Series A· $38M
Company data provided by crunchbase