CBSbutler Holdings Limited trading as CBSbutler
Open positions
Quantitative Developer - Python / Java - Market Risk & FRTB
Hands-on Python/Java developer building critical risk analytics and regulatory (FRTB) solutions for a City of London financial-markets team, sitting between Quantitative Research, Risk Strats and Engineering. Permanent role, hybrid with 2-3 days per week onsite, paying £70K-£110K.
Quantitative Developer – Python/Java, Market Risk & FRTB
Quantitative Developer building enterprise-scale market-risk analytics and regulatory (FRTB/IMA) applications in Python or Java — translating quantitative/regulatory requirements into technical solutions, working with time-series market data, testing frameworks and model validation. Permanent role in Central London, hybrid 2–3 days/week in office; £70k–£110k.
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 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.
Lead Java Engineer - Spring, Kubernetes | Onsite in Telford
Lead Java Engineer on a 12-month UK modernisation programme: hands-on development plus technical leadership of Java/Spring services on Kubernetes, owning low-level designs, mentoring engineers, and driving architectural best practices, with two days per week on-site in Telford.
Lead Java Engineer – Modernisation Tech Lead (Onsite Telford)
CBSbutler is hiring a Lead Java Engineer for a 12-month modernisation programme in Tax Administration in Telford, onsite 2 days per week at 75-79 GBP/hour (Inside IR35, PAYE). The tech lead owns low-level designs, drives delivery of scalable Java services, and mentors engineers alongside architects and QA leads.
Lead Java Engineer
Contract Lead Java Engineer (up to 12 months, inside IR35, PAYE) on a Tax Administration modernisation programme, hybrid with 2 days/week onsite in Telford. The engineer produces low-level designs, leads Java/Spring Boot service delivery on Kubernetes, and mentors engineers through the build phase.
Java Engineer - Market Data & RTSDK Migration (Hybrid)
CBSbutler is seeking a seasoned Java Engineer to join a London-based market data project, focusing on migrating from LSEG/Refinitiv RFA to RTSDK. You will analyse existing data usage, map features to RTSDK, and…
Java Engineer - Market Data
Java engineer to modernise a futures algorithmic trading platform by migrating its market data layer from the legacy LSEG/Refinitiv RFA API to RTSDK - analysing existing data usage, updating Java applications and shared frameworks, and safeguarding performance via automated/regression testing. London hybrid (3 days/week), £85K-£110K permanent.
Java Developer - Remote
Remote contract Java developer (6 months rolling, inside IR35, SC clearance required) on a UK Home Office project, building secure, scalable Java applications and services. Day to day: designing, developing and deploying Spring Boot services, REST APIs and microservices, working with SQL databases across the full lifecycle.
Java Engineer: WebLogic & Oracle in Enterprise Hybrid
Contract Java engineer joining an enterprise team to maintain live internal applications — keeping critical services running, supporting batch processing, and delivering controlled changes using Java, WebLogic, and Oracle. Hybrid role with two days on-site per week in the Telford area; 6-month rolling contract at £450/day, BPSS clearance required.
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…