# Backend Engineer

**Company:** [Twenty](https://hotfix.jobs/companies/twenty)
**Location:** Washington, DC
**Role:** Backend Engineering
**Experience:** 3+ years
**Skills:** Go, GraphQL, Rest, Neo4J, Aws Neptune, Nats, AWS, Kubernetes, Docker, CI/CD
**Posted:** 2025-10-12

> Builds scalable backend services in Go for cyber and electromagnetic systems, handling real-time data ingestion, graph modeling, event-driven architectures, and high-throughput APIs on AWS for national security applications. Requires 3+ years experience and strong Go proficiency.

## 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
- 3+ 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 Have
- 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.

## Tech Environment
- **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

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