Backend Engineer

About the role

You will build the backend systems that power Twenty’s cyber and electromagnetic capabilities. The work focuses on high‑throughput, low‑latency services that ingest real‑time operational signals and support mission‑critical national security outcomes.

Key responsibilities

• Design and implement scalable backend services in Go to improve operator decision‑making.
• Build high‑performance APIs for both customer‑facing workflows and internal platform capabilities.
• Model complex relationships in graph databases and optimise schemas and queries for speed.
• Implement event‑driven architectures (e.g., using NATS) to process real‑time data streams.
• Develop, test and operate microservices on AWS with a focus on resilience and cost‑aware scaling.
• Create and maintain CI/CD pipelines for fast, secure delivery of new features.
• Collaborate with cyber operations experts, frontend engineers and product teams to translate domain needs into robust features.

Required profile

• Passion for building systems that have real‑world impact in national security.
• Enjoy tackling hard backend problems such as throughput, latency, correctness and operability under pressure.
• Strong sense of ownership and ability to ship value quickly, then iterate and improve.
• Effective communicator who works well across disciplines and welcomes direct feedback.

Required skills

• Go programming language.
• AWS cloud platform.
• NATS or similar messaging systems.
• Graph databases and query optimisation.
• Microservices architecture.
• CI/CD pipeline development.
• Event‑driven system design.