# Senior Backend Engineer
**Company:** [Twenty](https://hotfix.jobs/companies/twenty)
**Location:** New York, NY
**Experience:** 5+ years
**Skills:** Go, GraphQL, Rest, Neo4J, Aws Neptune, Nats, AWS, Microservices, Docker, Kubernetes, CI/CD, Event-Driven Architecture
**Posted:** 2026-05-19
> Build scalable backend services in Go for cyber and electromagnetic defense systems. Design high-throughput APIs, graph data models, and event-driven architectures on AWS to support mission-critical national security operations.
## Job Description
## 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

## Requirements
- 5+ years of professional software development experience building backend (or full-stack) applications
- Strong proficiency with Go (Golang) and have shipped production services with it
- Experience working with graph databases (Neo4j, AWS Neptune, or similar), including schema design and query performance
- Working knowledge of event-driven architectures and message queues/streaming systems
- Experience building and maintaining APIs (REST and/or GraphQL)
- Experience with cloud infrastructure, ideally AWS, and understand cloud-native deployment patterns
- Hands-on experience with containerization and microservices architectures
- Strong foundation in secure coding practices and can reason about security tradeoffs
- Bachelor’s degree in Computer Science, Software Engineering, or a related field, or equivalent practical experience

## Nice-to-Haves
- Delivered software in defense, security, or other mission-critical environments
- Built systems for analysts, operators, or high-tempo users where speed and reliability matter
- Integrated AI/ML capabilities into production systems (inference, pipelines, or tooling)
- Experience with large-scale data processing and analytics workloads
- Contributed meaningfully to open-source projects
- Used observability tooling (metrics, tracing, logging) to debug and improve production systems

## Benefits
- Health: Medical, dental, and vision plan options; Life/AD&D, disability coverage
- Family: Paid parental leave (12 weeks for birthing parents, 4 for non-birthing, 6 weeks for adoptive/foster/surrogacy)
- Vacation: Paid holidays and flexible PTO
- Retirement: 401(k) with pre-tax and Roth options; HSA/FSA options
- At the office: Commuter benefits, on-site garage parking, bike storage, building fitness center, desk setup stipend
**Apply:** https://hotfix.jobs/jobs/senior-backend-engineer-at-twenty-78169c8b-66d6-46c0-82ec-804f31b4f030
**Canonical:** https://hotfix.jobs/jobs/senior-backend-engineer-at-twenty-78169c8b-66d6-46c0-82ec-804f31b4f030