TL;DR

C2 Software Backend Engineer (Real-Time Systems): Building and optimizing the core "nervous system" for a tactical Command and Control (C2) application with an accent on real-time telemetry, heavy video streams, and mission commands flow. Focus on ensuring low latency, fault tolerance, and secure data handling in resource-constrained tactical environments with degraded network conditions.

Location: On-site in Paris

Company

Harmattan AI is a next-generation defense prime building autonomous and scalable defense systems, recently valued at $1.4 billion after a $200M Series B.

What you will do

  • Design and implement ingestion pipelines for high-frequency telemetry and video streams from multiple robots.
  • Build inter-process communication (IPC) and local pub/sub systems for sensor data and commands.
  • Optimize backend efficiency on local tactical PCs, managing CPU and memory footprints.
  • Architect fault-tolerant state machines capable of handling network drops and packet loss.
  • Collaborate with mission planning algorithm designers, HMI frontend developers, and UX designers.

Requirements

  • B.S. or M.Sc. in Computer Science, Software Engineering, or a related field.
  • Minimum of 5-6 years of experience in high-reliability domains (e.g., defense, aerospace, fintech, or autonomous robotics).
  • Strong command of system-level languages such as C++, Rust, or Go.
  • Deep expertise in Real-Time Networking (UDP, TCP, WebRTC, gRPC, DDS, or custom binary protocols).
  • Expertise in Systems Architecture & IPC, specifically using bounded ring buffers or zero-copy shared memory.
  • Proficiency in profiling and capping resource footprints using tools like perf or cgroups.
  • English: B2 required.

Culture & Benefits

  • Work on technologies with real-world impact in a mission-critical environment.
  • Opportunity to pursue excellence and take on the hardest technical challenges.
  • Operate in a demanding environment where rigor, ownership, and execution are expected.
  • High degree of commitment to Harmattan AI’s mission.
  • Thrive in a fast-paced startup environment.
  • Ability to mediate technical trade-offs between hardware, algorithm, and frontend teams.