At a Glance
- Tasks: Design and develop high-performance digital products in the financial sector using C#/.NET and React.
- Company: Join a leading financial services firm in London with a focus on innovation.
- Benefits: Attractive salary, flexible working options, and opportunities for professional growth.
- Other info: Collaborative culture with a commitment to engineering excellence and continuous learning.
- Why this job: Make a real impact in a dynamic environment while enhancing your tech skills.
- Qualifications: Extensive experience in full stack development with C#/.NET and React required.
The predicted salary is between 51750 - 63250 £ per year.
Industry: Financial Services
Salary: 160,000Overview We are seeking a Senior Full Stack Developer to build and enhance high-performance, secure digital products within Financial Services.
You will work across backend services and modern web front ends, contributing to architecture, delivery, and continuous improvement.
This is a hands-on role with strong influence over engineering standards, quality, and technical direction.
Key Responsibilities Design, develop, test, and maintain scalable services using C#/.
NET (ASP.
NET Core) and RESTful APIs.
Build responsive, accessible user interfaces using React, Type Script, HTML, and CSS.
Implement secure authentication/authorisation (e. g., OAuth2/OIDC) and follow secure coding practices.
Optimise performance, reliability, and observability (logging, metrics, tracing).
Work with relational databases (e. g., SQL Server) including schema design, queries, and tuning.
Write automated tests (unit, integration, end-to-end) and participate in code reviews.
Collaborate with product, design, and stakeholders to refine requirements and deliver iteratively.
Contribute to CI/CD pipelines and cloud deployment practices.
Mentor engineers and promote best practice in engineering craft and delivery.
Required Skills & Experience Extensive commercial experience in full stack development with C#/.
NET and React.
Strong knowledge of .
NET Core, dependency injection, asynchronous programming, and API design.
Strong React experience including state management and modern front-end tooling.
Solid understanding of software design principles, patterns, and clean code practices.
Experience with SQL databases, ORM tooling (e. g., Entity Framework), and data modelling.
Experience with cloud platforms (Azure and/or AWS), containerisation (Docker), and CI/CD.
Understanding of Financial Services constraints: security, auditability, data protection, and resiliency.
Strong communication skills and ability to work effectively in an agile environment.
Desirable Experience with microservices, event-driven architecture (e. g., Kafka/Rabbit MQ), and distributed systems.
Infrastructure as Code (e. g., Terraform/Bicep) and advanced monitoring/alerting practices.
Experience building systems with low latency and high throughput requirements.
What You’ll Bring Ownership mindset, pragmatic decision-making, and a focus on delivering value safely.
Commitment to engineering excellence, continuous learning, and improving team ways of working.
Senior Full Stack Developer | C#.NET, React | London employer: Source Group International
As a Senior Site Reliability Engineer at our company, you will thrive in a dynamic and innovative work culture that prioritises collaboration and continuous learning. We offer competitive benefits, including flexible working arrangements and professional development opportunities, all set in a vibrant location that fosters creativity and growth. Join us to make a meaningful impact on our SaaS platform while enjoying a supportive environment that values your contributions and encourages your career advancement.
Contact Details:
Source Group International Recruitment Team
