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 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.
KDB+ Data Engineer: High-Performance Financial Pipelines
Permanent, hybrid role in London building and optimising high-performance KDB+/q and Python data pipelines for large financial datasets in the banking sector. Salary £70k-£80k per year.
Linux/DevOps SME
Contract Linux/DevOps Subject Matter Expert role, fully onsite in Basingstoke on a 12-month rolling contract (outside IR35) at £550–£650/day. The SME designs and maintains Linux infrastructure, automates with Terraform/Ansible, builds CI/CD pipelines and container platforms, and must hold active MOD DV clearance.
KDB+ Data Engineer - Financial Services
Permanent, hybrid role in the City of London for a hands-on KDB+ Data Engineer with 2-3 years of experience, building and optimising data pipelines for financial data in a banking environment using KDB+/q and Python. Salary £70K-£80K.
AWS DevOps Engineer
Six-month inside-IR35 contract (hybrid London) for an AWS DevOps Engineer on a confidential SC-cleared project, designing, building and operating secure, scalable AWS cloud platforms. Day to day is Terraform IaC, GitLab CI/CD pipelines, Docker, Lambda/serverless services and Python/Bash automation, paying £600–£675 per day.
Azure DevOps Engineer
DevSecOps Engineer (MOD / MODCloud) Rate: £645 per day inside ir35 Location: Remote Contract 6 months+ Active SC security clearance is required for this role We're looking for a Lead DevSecOps Engineer to take a key…
Data Engineer- MOD Environment
Contract Data Engineer (inside IR35, up to £600/day, until March 2027) on a long-term UK MOD defence programme, hybrid in the West Midlands. Builds and maintains Azure data pipelines and integrations using SQL and Python/PySpark to support reporting, KPIs/SLAs and data governance. Active DV clearance essential.
DV Cleared Data Engineer — Azure Data Pipelines
DV-cleared Data Engineer supporting a long-term UK defence programme in the West Midlands (hybrid). Day to day you build and maintain Azure-based data pipelines for secure data integration and reporting, using SQL, Python/PySpark, and Azure data services like Data Factory, Databricks, or Synapse.
Data Engineer
Contract Data Engineer (6+ months, hybrid in Malvern, inside IR35, GBP 550-600/day) supporting a Ministry of Defence programme. Day to day: building and optimising ETL/ELT pipelines, data models and secure databases with SQL and Python. Current active DV security clearance is essential.
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.
Python Application / DevOps Engineer
Application DevOps Engineer - Python London - Hybrid Permanent - £85K - £100K + Bonus + Full Benefits Financial Services Firm is hiring for an experienced Python Application DevOps Engineer to join a high-performing…
KDB+/q and Python Developer
Recruiter CBSbutler is hiring a permanent, hybrid KDB+/q and Python Developer in London (£85K–£115K) for a client's technology team. The role focuses on building and optimising high-performance, data-driven applications, time-series data pipelines, and query performance, ideally with financial services or capital markets experience.
Data Engineer x 3
Data Engineer x 3 Telford / Hybrid - 2 days onsite £460 per day inside ir35 6 month contract Active SC clearance We are currently recruiting for three Data Engineers to join a major data transformation and migration…