Senior Full Stack Developer .Net & React/Typescript

Computer Futures; Leeds; On-site; GBP 70,000 - 110,000; Full time

Job summary

Computer Futures, a trading division of SThree, is seeking an experienced Senior Full Stack Engineer to design, develop and deploy modern digital products and services. This hands-on role combines technical depth with architectural leadership and mentoring across delivery teams.

You will work in an Agile environment, delivering scalable, secure applications using React, TypeScript and .NET/C#. You’ll drive engineering best practices, champion testing and automation, and shape the technical

Qualifications

• Experience building scalable web applications using React, TypeScript and .NET/C#.
• Proven ability to lead architectural discussions and influence technical direction.
• Strong mentoring and coaching skills within engineering teams.
• Solid understanding of Agile practices and end-to-end delivery.

Responsibilities

• Design, develop and maintain high-quality applications and services using React, TypeScript and .NET/C#.
• Take ownership of complex technical solutions from initial design through to deployment and operational support.
• Deliver scalable, secure and maintainable code following modern engineering practices.
• Lead technical investigations, proof-of-concepts and prototyping activities.
• Own complex technical challenges and drive solutions across multiple systems and teams.
• Ensure software is designed with performance, resilience and long-term maintainability in mind.

Skills

React

TypeScript

.NET/C#

Architectural leadership

Mentoring

Agile/Scrum

Tools

Azure

CI/CD

Job description

We are seeking an experienced Senior Full Stack Engineer to play a key role in the design, development, deployment and support of modern digital products and services. This is a hands‑on senior engineering position that combines deep technical expertise with architectural leadership, mentoring and ownership of software delivery standards.

Working within a collaborative Agile environment, you will take responsibility for delivering scalable, secure and highly reliable solutions across both front‑end and back‑end technologies. You will drive engineering best practices, champion automation and quality, and help shape the technical direction of digital platforms and customer‑facing applications.

This role offers the opportunity to influence architecture, improve engineering capability across the team and work closely with Product, Architecture, Security and Operations stakeholders to deliver high‑quality software solutions.

Key Responsibilities

Software Development & Solution Delivery

• Design, develop and maintain high‑quality applications and services using React, TypeScript and .NET/C#.
• Take ownership of complex technical solutions from initial design through to deployment and operational support.
• Deliver scalable, secure and maintainable code following modern engineering practices.
• Lead technical investigations, proof‑of‑concepts and prototyping activities.
• Own complex technical challenges and drive solutions across multiple systems and teams.
• Ensure software is designed with performance, resilience and long‑term maintainability in mind.

Architecture & Technical Leadership

• Lead technical design discussions and contribute to strategic architectural decisions.
• Define service boundaries, API contracts, integration patterns and data flows.
• Promote modern software architecture principles, including modular design and domain‑driven approaches.
• Work closely with Architecture teams to ensure alignment with technology standards and long‑term roadmaps.
• Identify technical risks and recommend appropriate mitigation strategies.
• Influence the future direction of digital products and engineering practices.

Engineering Quality & Testing

Champion a quality‑first engineering culture. Define and implement testing strategies across applications and services. Promote Test‑Driven Development (TDD) and automation‑first approaches. Drive improvements in automated testing, including:

• Unit Testing
• Integration Testing
• API Testing
• Contract Testing
• End‑to‑End/UI Testing
• Performance Testing

Ensure quality gates are embedded within deployment pipelines. Continuously improve software reliability, maintainability and code quality standards.

DevOps & Cloud Engineering

• Drive best practices across CI/CD pipelines and automated deployments.
• Implement and improve release strategies including feature flags and progressive delivery techniques.
• Ensure applications are built and deployed using secure and repeatable processes.
• Support cloud‑native development principles and modern DevOps practices.
• Work within Azure‑based environments and contribute to ongoing platform improvements.
• Promote automation across build, test and deployment activities.

Operational Support & Reliability

• Take ownership of the operational health of applications and services.
• Implement and improve observability through logging, monitoring, metrics and tracing.
• Lead incident investigation and resolution activities.
• Conduct post‑incident reviews and ensure lessons learned are embedded into future development.
• Identify and resolve technical debt, defects and performance bottlenecks.
• Participate in an agreed out‑of‑hours support rota where required.

Mentoring & Team Development

• Provide technical leadership and support to engineers across the development team.
• Mentor and coach developers to improve technical capability and delivery practices.
• Lead code reviews and technical design reviews.
• Promote engineering best practices and continuous improvement.
• Share knowledge through technical workshops, communities of practice and team collaboration activities.
• Act as a senior technical point of contact within the wider engineering function.

Stakeholder Engagement

• Collaborate with Product Managers, Architects, QA Engineers, UX Designers, Security Specialists and Operations teams.
• Build strong relationships with stakeholders across technology and business functions.
• Communicate complex technical concepts clearly to both technical and non‑technical audiences.
• Contribute to governance, risk, compliance and security discussions where required.
• Support the delivery of strategic technology initiatives and digital transformation programmes.

Computer Futures, a trading division of SThree Partnership LLP is acting as an Employment Business in relation to this vacancy | Registered office | 8 Bishopsgate, London, EC2N 4BQ, United Kingdom | Partnership Number | OC(phone number removed) England and Wales