Software Engineer | Defence Start-Up | London

OHO Group (Lithuania); Greater London; On-site; GBP 90,000 - 130,000; Full time

Job summary

OHO Group (Lithuania) is seeking a Software Engineer for a defence start-up in London. The role offers significant ownership over mission-critical systems and end-to-end responsibility for the software you build.

You will join a small, high-calibre team designing, building, and deploying core technology with real-world impact in a fast-paced, autonomous environment. The position targets engineers with interest in defence, aerospace, or national security tech.

Qualifications

• 4+ years of professional Software Development experience.
• Proficient in Python, TypeScript, Rust, Go, Java, or C++.
• A true generalist - comfortable working across backend, infrastructure, data, and automation
• Most effective in fast-paced, high-autonomy environments
• Motivated by building technology with real-world impact
• Interested in defence, aerospace, or national security technology

Skills

4+ years exp

Python

TypeScript

Rust

Go

Java

C++

Generalist

High autonomy

Job description

Software Engineer | Defence Start-Up | London

Software Engineer required for an early-stage defence technology start-up building mission-critical systems with real-world impact.

You’ll join a small, high-calibre engineering team designing, building, and deploying core technology. This is a deeply hands-on role for someone who wants significant ownership, technical depth, and end-to-end responsibility over the systems they build.

You are

• 4+ years of professional Software Development experience
• Proficient in Python, TypeScript, Rust, Go, Java, or C++
• A true generalist - comfortable working across backend, infrastructure, data, and automation
• Most effective in fast-paced, high-autonomy environments
• Motivated by building technology with real-world impact
• Interested in defence, aerospace, or national security technology

Nice to have

• Early-stage start-up experience
• Experience in robotics, embedded systems, ML, or real-time systems

Why Join?

• Competitive salary + meaningful equity
• Significant influence over product and technical direction
• Work on challenging engineering problems with genuine real-world impact
• Build mission-critical technology within the defence sector
• Join a small, world‑class team with significant autonomy and trust

If you’re a strong Software Engineer who wants to build challenging technology that actually matters.

Software Engineer | Defence Start-Up | London