Senior Software Engineer – Python / AWS / Cloud (SC or DV Cleared)

La Fosse Associates; England; On-site; GBP 73,800 - 110,700; Part time

Benefits offered by this job

Flexible working arrangements

Competitive day rate or salary

Job summary

La Fosse Associates is hiring a Software Engineer / Developer in the UK for a contract position within the public sector. The role requires active SC or DV clearance and experience in AWS, Python, and Terraform. Candidates will design cloud-native applications and support secure, scalable systems. Benefits include flexible working arrangements and competitive compensation. This position offers the chance to work on high-impact national systems in a complex regulatory environment.

Qualifications

• Active SC or DV clearance (non‑negotiable).
• Strong experience as a Software Engineer / Developer.
• Experience building cloud‑native applications on AWS.

Responsibilities

• Designing and building cloud‑native applications on AWS.
• Developing backend services and APIs, primarily in Python.
• Defining and maintaining infrastructure using Terraform.
• Collaborating with product, platform, and security teams in agile delivery.

Skills

AWS (e.g. Lambda, ECS/EKS, EC2, S3, RDS, API Gateway)

Python used in production environments

Terraform (infrastructure as code)

Experience building APIs and backend services

Familiarity with CI/CD pipelines

Comfortable working in secure or regulated environments

Job description

Software Engineer / Developer (AWS, Python, Terraform)

Location: UK (Hybrid / Remote – clearance dependent)
Security Clearance: SC or DV required
Engagement:Contract (Inside IR35)
Sector: Public Sector / Defence / National Infrastructure

The Role

We are working with a secure public‑sector programme delivering mission‑critical digital services used at national scale.
They are looking for an experienced Software Engineer / Developer with strong cloud‑native engineering skills to design, build, and operate modern systems in highly regulated environments.

This is a hands‑on engineering role — you will be writing production code, working closely with infrastructure, and contributing across the full delivery lifecycle.

Please note: Due to the nature of the work, active SC or DV clearance is mandatory.

What You’ll Be Doing

• Designing and building cloud‑native applications on AWS

• Developing backend services and APIs, primarily in Python

• Defining and maintaining infrastructure using Terraform

• Working across the full SDLC: design, build, test, deploy, and operate

• Collaborating with product, platform, and security teams in agile delivery

• Supporting secure, scalable, and resilient systems in production

• Contributing to CI/CD pipelines and operational best practices

• Working on systems that matter — national services, defence, or critical infrastructure

Essential Skills & Experience

• Active SC or DV clearance (non‑negotiable)

• Strong experience as a Software Engineer / Developer

• AWS (e.g. Lambda, ECS/EKS, EC2, S3, RDS, API Gateway)

• Python used in production environments

• Terraform (infrastructure as code)

• Experience building APIs and backend services

• Familiarity with CI/CD pipelines and cloud deployment

• Comfortable working in secure or regulated environments

Nice to Have

• Experience with FastAPI, Flask, Django, or similar frameworks

• Exposure to frontend technologies (React, Next.js, Angular)

• Experience with containerisation (Docker, Kubernetes)

• Background in public sector, defence, or government programmes

• Understanding of DevSecOps and cloud security best practices

• Experience supporting live services at scale

What’s on Offer

• Work on high‑impact, nationally significant systems

• Modern cloud and engineering practices

• Highly skilled, clearance‑holding engineering teams

• Flexible working arrangements (where clearance allows)

• Competitive day rate or salary (dependent on clearance and experience)

Eligibility

Due to the security requirements of this role, applicants must already hold active SC, SC Enhanced or DV clearance. Unfortunately, we cannot sponsor clearance for this position.