Senior Full Stack Engineer

Markit; East Hagbourne; On-site; GBP 100,000 - 125,000; Full time

Job summary

A leading recruitment agency is seeking a Senior Full Stack Engineer for a contract role in Didcot, Oxfordshire. The role requires SC Clearance or eligibility and focuses on backend architecture and APIs, utilizing Python and FastAPI. This is a 3-month contract with potential for extension or permanent placement. Competitive rates of £500 to £700 per day are offered.

Qualifications

• SC Clearance or eligibility for SC Clearance is essential.
• Experience in backend architecture and APIs.
• Proficient in Python and FastAPI.

Responsibilities

• Develop backend architecture and APIs with a primary focus on backend services.
• Design scalable backend services for high-availability workloads.

Job description

Senior Full Stack Engineer

• Job Reference: 2609289781-2
• Date Posted: 7 February 2026
• Recruiter: MarkIT Placements
• Location: Didcot, Oxfordshire
• Salary: £500 to £700 Per Day
• Sector: I.T. & Communications
• Job Type: Contract

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Job Description

SC Clearance or eligibility for SC Clearance Essential

Backend Focus

3 month contract with scope to extend or go permanent

Key Responsibilities

Your responsibilities will include, but not limited to:

• Backend architecture & APIs (primary focus)
• Design and evolve scalable backend services in Python using FastAPI for high-availability, high-throughput workloads