Senior Software Engineer in Leicester

Senior Software Engineer (Python – FastAPI)

This fast-growing consultancy is pushing the boundaries of AI and data science, helping clients turn complex challenges into scalable, production-ready solutions. They’re now hiring a Senior Software Engineer who can blend deep technical expertise with a practical, delivery-focused mindset.

Role Overview:

Location: London (hybrid)

Package: Competitive salary + bonus + benefits

Industry: AI, Data Science & Technology Consulting

Security Clearance: Applicants Must have Active SC Clearance or above

What You’ll Be Doing:

• Leading the end-to-end design and build of applications that utilise advanced AI and data-led software solutions.
• Developing scalable data pipelines and backend services that support complex modelling work.
• Setting standards for clean, efficient engineering across Python(FastAPI), SQL and cloud environments.
• Training, tuning and deploying machine learning models into production.
• Creating processes for robust data extraction, transformation and management.
• Integrating new solutions with existing systems and ensuring smooth deployment.
• Producing clear technical documentation and presenting findings to clients.
• Staying current with emerging technologies and bringing fresh ideas into the team.
• Contributing to proposals and shaping new project opportunities.
• Mentoring junior engineers and driving best practice across the engineering team.

Main Skills Needed:

• Strong track record delivering complex software projects end-to-end.
• Deep expertise in Python Application Development (FastAPI), with a strong SQL capability.
• Hands-on experience building data pipelines, APIs and backend services.
• Solid understanding of cloud platforms (Azure/GCP) and Bash scripting.
• Advanced Docker knowledge, including storage, volumes and permissions.
• Strong grounding in software engineering principles, version control and CI/CD.
• Ability to review and improve others’ code with a collaborative approach.
• Excellent communication skills and confidence presenting technical work.
• Experience mentoring or line-managing technical team members.
• Eligible for UK security clearance (British citizenship and UK residency for 5+ years).

What’s in It for You:

• A genuinely entrepreneurial environment with autonomy and variety.
• Projects spanning multiple industries, technologies and data challenges.
• 26 days’ holiday + bank holidays + your birthday off.
• BUPA private healthcare and a £1,000 annual development budget.
• Performance-based bonus and hybrid working from a modern Shoreditch office.
• Work from abroad for one month each year.
• Regular socials, snacks and a supportive, ambitious team.

Think it could be a fit? We’d love to hear from you.

We are an equal opportunity employer and value diversity at our company. We do not discriminate on the basis of race, religion, colour, national origin, gender, sexual orientation, age, marital status, veteran status, or disability status.

By applying you are confirming you are happy to be added to the Addition Solutions mailing list regarding future suitable positions. You can opt out of this at any time simply by contacting one of our consultants.