About The Role

FDM is a global business and technology consultancy seeking a Senior R Developer / Software Engineer to work for our client within the public sector. This is initially a 4- month contract with the potential to extend and will be a hybrid role that will be based in London

We are seeking an experienced Senior R Developer / Software Engineer to support the enhancement and modernisation of critical data and reporting solutions. The successful candidate will play a key role in upgrading existing platforms, reducing technical debt, improving application performance, and ensuring the ongoing reliability of business-critical systems.

This role requires a strong software engineering mindset, combining advanced R development expertise with a focus on testing, automation, quality assurance, and scalable data solutions.

Key Responsibilities:

Design, develop, maintain, and enhance complex applications and data solutions using R.
Refactor legacy codebases to improve maintainability, performance, scalability, and code quality.
Modernise existing systems and migrate applications to newer technology platforms.
Develop and maintain data transformation pipelines that support reporting and analytical requirements.
Create and manage reusable R packages, libraries, and software components.
Implement software engineering best practices, including version control, code reviews, documentation, and automated deployment processes.
Optimise application performance and resolve technical debt across existing solutions.
Collaborate with technical and business stakeholders to understand requirements and deliver robust solutions.
Ensure continuity and consistency of outputs when implementing system improvements or platform changes.
Design and execute comprehensive testing strategies, including regression testing, reconciliation activities, and automated validation processes.
Develop quality assurance frameworks to ensure code changes are thoroughly tested and do not impact established outputs.
Support the enhancement of reporting and analytical capabilities through improved data models and processing logic.
Contribute to proof of concepts and innovation initiatives using modern cloud and analytics technologies.

About You

Extensive experience developing and maintaining complex applications using R.
Strong understanding of software engineering principles and best practices.
Experience building and maintaining data transformation and processing pipelines.
Proven experience creating and managing R packages and reusable code frameworks.
Experience developing proof-of-concept solutions using Databricks.
Understanding of modern data engineering, cloud analytics, and scalable data architectures.
Experience designing and delivering Power BI dashboards and reports.
Experience maintaining and modernising business-critical reporting platforms.
Strong understanding of data modelling and reporting workflows.
Experience refactoring legacy systems while maintaining output consistency and reliability.
Tech Stack: R, SQL, Git/Azure DevOps, Power BI, Databricks, Python, Microsoft Power Platform and Excel.

About Us

FDM is an award-winning global leader in tech and business talent solutions, backed by more than 35 years of industry experience. We have centres across Europe, North America, and Asia-Pacific, and a global workforce of over 2500 employees. FDM has shown exponential growth throughout the years, firmly establishing itself as an award-winning employer, currently listed on the FTSE4Good Index and as a 2026 Financial Times UK ‘Best Employer’.

Diversity and Inclusion

FDM Group is an equal opportunity employer, and all qualified applicants will receive consideration for employment without regard to race, colour, religion, sex, sexual orientation, national origin, age, disability, veteran status or any other status protected by federal, provincial or local laws.

Why join us

Career coaching, mentoring and access to upskilling throughout your entire FDM career
Assignments with global companies and opportunities to work abroad
Opportunity to re-skill and up-skill into new areas, develop non-linear career paths and build a skillset within your field
Annual leave and work-place pension

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