Job Description:

Senior Full Stack Developer (React / C# .NET)

Contract: Initial 3-Month Engagement (Long-Term Programme)
IR35 Status: Outside IR35
Location: Hybrid Working - Approximately 1 day per week in Birmingham (flexible based on project requirements)

Rate: £500 per day Outside IR35

Overview

We are seeking experienced Senior Full Stack Developers to join a major business transformation programme focused on modernising platforms, data capabilities, and core business processes.

This is an opportunity to play a key role in the design, development, and delivery of enterprise-scale solutions, working across both front-end and back-end technologies while contributing to data migration, integration, and technical design activities.

The successful candidates will be strong engineers with deep expertise in React and C#/.NET, capable of operating across the full technology stack and collaborating closely with Product Owners, Business Analysts, Architects, and Testing teams within an Agile delivery environment.

Key Responsibilities

Full Stack Development

• Design, develop and maintain modern web applications using React and C#/.NET.
• Deliver robust front-end experiences with a strong focus on usability and performance.
• Build scalable and maintainable back-end services, APIs, and integrations.
• Contribute across the full technology stack where required.
• Support development best practices, code quality, and technical standards.

Data & ETL

You will support key data transformation initiatives, including:

• Migration of existing artefacts into target data models.
• ETL solution design and implementation.
• Development of data ingestion processes and pipelines.
• Integration with target platforms, applications, and databases.
• Validation, transformation, and reconciliation of legacy data.

Technical Design & Architecture

Working alongside Architects and technical stakeholders, you will contribute to:

• Solution architecture discussions.
• System and integration design activities.
• Environment and deployment strategy.
• Technical assessments and feasibility analysis.
• Definition of implementation approaches and delivery options.

Agile Delivery

• Participate in workshops, discovery sessions, and sprint planning activities.
• Refine business requirements and technical features.
• Provide estimates and support work sizing exercises.
• Contribute to sprint delivery and release activities.
• Collaborate closely with Product Owners, Business Analysts, Architects, and Test teams.

Essential Skills & Experience

• Extensive commercial experience as a Full Stack Developer.
• Strong expertise in React and modern front-end development practices.
• Strong experience with C#/.NET and back-end API development.
• Experience designing and developing enterprise-grade applications.
• Proven experience working on data migration, ETL, or integration projects.
• Strong understanding of relational databases and data modelling.
• Experience contributing to technical design and architectural discussions.
• Comfortable working within Agile delivery teams.
• Excellent stakeholder engagement and communication skills.

Desirable Experience

• Experience working on large-scale transformation programmes.
• Exposure to cloud-based architectures and modern deployment approaches.
• Experience integrating with multiple enterprise platforms and third-party systems.
• Familiarity with Jira, Confluence, and Agile tooling.