CBSbutler Holdings Limited trading as CBSbutler
Open positions
Senior Developer
Contract Senior Developer (up to £525/day inside IR35) on a major UK government AI programme, building an enterprise AI enablement platform — initially an Enterprise AI Gateway integrating AI models, developer tooling and security controls. Requires strong backend/cloud engineering, hands-on Generative AI experience and active SC clearance.
Senior Network Engineer (Squid Proxy & Palo Alto Security)
Contract role (up to £780/day inside IR35) for a senior network engineer to own and optimise enterprise Squid proxy and Palo Alto next-gen firewall services — security policies, SSL decryption, packet analysis and upgrades — hybrid with two onsite days per week. Requires active SC clearance and sole UK national status.
Senior Developer
Senior backend developer (contract, up to £525/day inside IR35) building an Enterprise AI Gateway and AI enablement platform for a major UK government AI programme. Day to day: production backend services and REST APIs, LLM integrations via AWS Bedrock, CI/CD, and secure cloud infrastructure on AWS.
Senior SQL Server DBA – DV Cleared
Salary: £? - ? per year Requirements: Proven experience as a Senior SQL Server DBA in business-critical production environments Strong SQL Server administration experience across multiple versions Hands-on experience…
Senior DevOps / Automation Engineer
6-month, inside-IR35 remote contract for a Senior DevOps/Automation Engineer building production-grade automation and CI/CD across IBM Z mainframe and distributed platforms, using Python, Ansible Automation Platform, Jenkins/GitHub (Groovy), PostgreSQL, Grafana/Splunk observability and HashiCorp Vault for secure, auditable workflows.
Senior Linux & DevOps SME - Onsite Contract
12-month rolling onsite contract in Basingstoke (outside IR35, £550–£650/day) for a Linux/DevOps SME who will lead Linux infrastructure, automate operations, and drive CI/CD improvements while working closely with security and engineering teams.
Senior Java Engineer
Contract Senior Java Engineer (6-month rolling, inside IR35) on HMRC's Tax Administration Modernisation Programme, building backend services in agile Scrum teams, including the Historical Records Store. Core stack: Java/Spring, RabbitMQ, MongoDB/Oracle, Python, Git/GitLab, plus AI-assisted development; hybrid with 2 days onsite in Telford and BPSS clearance required.
Senior Linux and DevOps Engineer - Onsite Reading DV
CBSbutler Holdings Limited trading as CBSbutler is seeking an experienced Linux Subject Matter Expert to join a high-profile technical environment onsite in Reading. You will provide senior-level expertise across Linux…
Senior SC-Cleared Azure DevOps Engineer – Hybrid London
Six-month+ contract (inside IR35) for an SC-cleared Azure DevOps Engineer working hybrid in London, delivering automation, CI/CD design and tooling across AWS, Azure and GCP for confidential UK government work. Pays £650–£675 per day.
Senior Java Engineer - AI-Driven Backend, Hybrid
CBSbutler is seeking a Senior Java Engineer to join a major HMRC-driven Tax Administration Modernisation project. The position is hybrid with 2 days onsite in Telford, and up to 3 days remote. You will contribute to…
Senior Linux & DevOps SME – Onsite, MOD DV Cleared
CBSbutler Holdings Limited trading as CBSbutler is seeking a Linux/DevOps SME for an onsite assignment in Basingstoke. You will lead Linux infrastructure, DevOps tooling and platform engineering in a high-profile…
Linux/DevOps SME - DV Cleared
A 12-month rolling, outside-IR35 contract (550-650/day) for a hands-on Linux/DevOps Subject Matter Expert, fully onsite in Basingstoke. The contractor acts as a technical authority building Linux platforms, CI/CD pipelines and infrastructure-as-code, with active MOD DV clearance essential.