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

Adecco

London, United Kingdom

2 weeks ago

Seniority: Senior
Posted: 20 Apr 2026 (2 weeks ago)

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Job Title: Senior Full Stack Developer (React & C#.NET)

Contract Length: 12 Months

Location: London - 3 Days a week

Daily Rate: Circa £650/Day (Inside IR35)

About the Role

Join our dynamic team as a Senior Full Stack Developer, where your expertise in React JS and C# .NET Core will shine! We are looking for a tech-savvy professional with a passion for building scalable applications within the financial sector. This is an exciting opportunity to work with cloud-native architectures and cutting-edge technologies. If you thrive in a collaborative environment and are eager to make an impact, we want to hear from you!

Technical Skills

Front-end: Strong proficiency in React.js, JavaScript/TypeScript, Redux/RTK, and modern UI patterns, develop framework is essential

Back-end: Expertise in C# .NET Core, REST APIs, and microservices-based development is essential

Python (pyspark): Experience with data pipelines and analytics is a plus.

Power BI: Familiarity with developing dashboards and data models.

Architecture: Knowledge of microservices, API design, and event-driven architectures.

DevOps/CI/CD: Experience with Azure DevOps, GitLab, GitHub Actions, or similar tools.

Cloud Platforms: Proficient in Azure or AWS (Azure preferred).

Databases: Strong skills in SQL Server, PostgreSQL, or other relational databases.

containerisation: Experience with Docker and Kubernetes.

Key Responsibilities

Design & Develop: Create and maintain full stack applications using React JS and C#.NET Core.

Build Services: Develop high-performance backend services and RESTful APIs with a focus on scalability and resilience.

Create UI Components: Craft responsive and modular UI components using React JS and modern JavaScript/TypeScript patterns.

Collaboration: Work closely with business stakeholders and domain experts in Risk, Regulatory Reporting, and Finance.

Power BI Expertise: utilise your knowledge of Power BI to develop dashboards and analytical reports.

CI/CD Implementation: Collaborate with DevSecOps to optimise CI/CD pipelines, ensuring automated testing and deployment.

Architecture Contribution: Contribute to event-driven and distributed system designs using technologies like Kafka or Event Hub.

Mentorship: Guide junior developers and foster a collaborative atmosphere within a cross-functional agile team.

Soft Skills

A strong engineering mindset with a relentless curiosity.

Excellent analytical and problem-solving abilities.

Exceptional communication skills to interact with both technical and non-technical stakeholders.

An agile mindset with experience in Scrum/Agile environments.

Ability to work independently and lead technical solutions from start to finish.

Why Join Us?

Work on innovative projects that make a difference in the financial sector.

Collaborate with a talented team in a vibrant environment.

Enjoy a competitive daily rate and flexible working arrangements.

If you are ready to take your career to the next level and contribute to exciting projects, apply now! We can't wait to meet you!

Pontoon is an employment consultancy. We put expertise, energy, and enthusiasm into improving everyone's chance of being part of the workplace. We respect and appreciate people of all ethnicities, generations, religious beliefs, sexual orientations, gender identities, and more. We do this by showcasing their talents, skills, and unique experience in an inclusive environment that helps them thrive. If you require reasonable adjustments at any stage, please let us know and we will be happy to support you

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