[DV CLEARED ONLY] Software Engineer (Front/Back/Fullstack) — National Security

Opus Recruitment Solutions Ltd; United Kingdom; Hybrid; GBP 55,000 - 75,000; Full time

Job summary

A recruitment agency seeks a Full Stack Software Engineer for national security projects. The role involves building secure software, collaborating with teams, and requires active DV clearance. Ideal candidates will have experience with Python, Java, and cloud technologies. The position offers a hybrid work environment in the UK, focusing on impactful technology that enhances national safety.

Benefits

On-site gyms

Green spaces

Excellent transport links

Qualifications

• Active DV clearance required.
• Experience in building secure, scalable software across the stack.
• Proficient in translating ideas into clean, test-driven code.

Responsibilities

• Build secure, scalable software across the stack.
• Collaborate with users to shape solutions.
• Work in agile teams to deliver software at pace.
• Design and integrate components across environments.

Skills

Python

Java

Golang

JavaScript

C++

React

Vue.js

AngularJS

Node.js

Nginx

Caddy

Uvicorn

PostgreSQL

MySQL

MongoDB

Cassandra

AWS

Azure

GCP

Docker

Kubernetes

Bash

PowerShell

Job description

Overview

Full Stack Software Engineer – National Security Projects

Location: Hybrid, 3-4 days on-site

Clearance: MUST HOLD ACTIVE DV CLEARANCE

Build tech that matters.

This isn’t about shaving milliseconds off a checkout flow or tweaking ad algorithms. This is about designing and delivering software that protects lives, missions, and national infrastructure. You’ll be part of a trusted team working at the heart of UK National Security, solving complex problems with cutting-edge tools — and doing it fast.

We’re looking for curious, adaptable Full Stack Engineers who thrive on variety, love learning new tech “just in time,” and want to work on systems that genuinely make a difference.

What You’ll Be Doing

• Building secure, scalable software across the stack — from slick UIs to robust APIs and data pipelines
• Collaborating with users, researchers, and engineers to shape solutions from concept to deployment
• Working in agile teams to deliver working software at pace
• Translating ideas into clean, test-driven code that’s easy to maintain and open by default
• Designing and integrating components across cloud, containerised, and on-prem environments
• Helping shape strategy and tech direction in a fast-moving, mission-led environment

Tech You Might Use

We don’t expect you to know it all — but if you’ve worked with any of the following, you’ll hit the ground running:

• Languages: Python, Java, Golang, JavaScript, C++
• Front End: React, Vue.js, AngularJS
• Back End / Web: Node.js, Nginx, Caddy, Uvicorn
• Databases: PostgreSQL, MySQL, MongoDB, Cassandra
• Cloud & Containers: AWS, Azure, GCP, Docker, Kubernetes
• Scripting: Bash, PowerShell

Why This Role?

• Impact: You’ll be building tech that directly contributes to national safety and resilience.
• Growth: Long-term programmes, modern tech stacks, and a culture of continuous learning.
• Environment: Work from sustainable, well-equipped offices in Hampshire or Greater London, with on-site gyms, green spaces, and excellent transport links.
• Culture: No corporate fluff — just smart people solving hard problems together.

Ready to build something that matters?

If you want to work on meaningful tech in a secure, mission-led environment—we’d love to hear from you.