Sr. Full Stack Developer

We are seeking an experienced Tech Lead to spearhead the modernisation of a large-scale enterprise application from legacy ASP.NET to a modern .NET 10 Web API and React stack. You will own the technical direction of a cross-functional delivery pod, mentor a team of developers, and drive hands-on engineering across both frontend and backend.
This is a hands-on leadership role — you will write production code, lead architecture decisions, and be accountable for the technical quality of everything your pod delivers. You will work in a structured Agile environment, collaborating closely with the Solution Architect, QA leads, and client stakeholders across a multi-year, multi-phase modernisation programme.
What You Will Do
Technical Leadership
Own end-to-end technical delivery of your pod — architecture, design, coding, code review, and quality gates
Lead the migration from legacy ASP.NET (MVC / Web API / Web Forms) to .NET 10 REST APIs and React 18 frontend
Define and enforce coding standards, branching strategy, and PR review process across the pod
Produce Architecture Decision Records (ADRs) for all significant technical choices
Conduct structured code reviews covering architecture, security, performance, and maintainability — not just syntax
Identify and resolve technical debt proactively; maintain a tech debt register visible to stakeholders
Set up and maintain CI/CD pipelines (GitHub Actions / Azure DevOps) with quality gates: SonarQube, unit coverage, OWASP dependency scan
Collaborate with Solution Architect on cross-pod API contracts, shared services, and infrastructure decisions
Hands-On Engineering
Design and build .NET 10 Web API microservices using Clean Architecture and Domain-Driven Design patterns
Build React 18 SPAs: component architecture, Redux Toolkit / Zustand state management, routing, and performance optimisation
Implement OAuth2 / OIDC / JWT authentication and role-based access control
Design and optimise relational database schemas (SQL Server / PostgreSQL); write complex LINQ and EF Core queries
Build and consume RESTful APIs with versioning, error handling, and OpenAPI documentation
Write unit, integration, and contract tests as a core part of the Definition of Done
Migration & Modernisation
Lead the technical approach for migrating legacy ASP.NET code to .NET 10 — analysis, characterisation testing, phased migration, parity validation
Use GitHub Copilot and AI-assisted tooling to accelerate migration while maintaining review discipline
Identify breaking changes, deprecated dependencies, and third-party package migration paths
Establish repeatable migration patterns that the whole pod can follow consistently across modules
Ensure all migrated code has adequate unit test coverage before merge — parity tests are non-negotiable
Team Leadership & Mentoring
Lead a pod of 4–6 engineers (mix of senior, mid, and junior developers)
Run daily technical standups, remove technical blockers, and escalate risks to the Architect early
Mentor mid and junior developers through pair programming, code reviews, and 1:1 technical guidance
Create a learning environment — internal tech talks, documentation, actionable review feedback
Make resourcing recommendations and flag capacity risks to the Delivery Manager
Agile Delivery (Added Advantage)
Participate in Scrum ceremonies — Sprint Planning, Daily Standup, Sprint Review, Retrospective, Backlog Grooming
Collaborate with the Product Owner / BA to refine user stories, provide technical input on acceptance criteria, and raise technical stories
Provide accurate SP estimates; track sprint progress and flag scope risk early
Support the Scrum Master in removing impediments with a technical root cause
Champion the Definition of Done — ensure every story that ships meets quality, test, and documentation standards

Work arrangement
No