Senior Full Stack Engineer

You'll drive technical architecture across Synextra's client projects - designing scalable full-stack systems, leading technical decisions across the Python and TypeScript stack, and building solutions that run securely and cost-effectively within our Azure estate. This is a hands-on senior development role where your architectural choices directly shape what we ship to clients.

Day to day, you'll work across the full delivery lifecycle: designing robust backend services and APIs, building performant React frontends, and collaborating with customers, product owners, and infrastructure specialists to deliver business-critical applications. You'll own end-to-end technical delivery on our most ambitious projects - with increasing opportunities to incorporate AI/LLM capabilities as our AI Services Division grows.

This role suits someone who thrives on complex distributed systems problems, has a genuine interest in the rapidly evolving AI/LLM landscape, and wants genuine autonomy over how things get built. You'll also play a mentorship role - raising the engineering bar across the team as we scale.

Responsibilities

• Design scalable, secure, and fault-tolerant full-stack architectures, ensuring high availability and resilience across Azure-hosted environments

• Architect robust backend services in Python using modern frameworks (FastAPI, Pydantic), implementing clean API design, efficient data pipelines, and integration patterns within our Azure ecosystem

• Establish and enforce best practices for the TypeScript/React frontend, ensuring a highly performant, accessible, and intuitive user experience, including real-time interfaces and interactive data visualisations

• Lead the configuration and optimisation of Azure cloud environments, establishing robust CI/CD pipelines with GitHub Actions or Azure DevOps, and ensuring cost-optimised use of Azure services and container orchestration resources

• Set the standard for code quality through comprehensive code reviews, technical design documents, and architectural decision records; mentor junior and mid-level engineers to grow their capabilities

• Champion engineering best practices including security-first development, comprehensive testing, and compliance with data protection regulations; contribute to emerging AI/LLM features as our capabilities expand

• Identifying patterns in recurring issues and engineering permanent solutions

• Contribute to technical pre-sales and client engagements by providing architectural guidance, solution design, and effort estimation

Essential Technical Skills

• 6+ years of professional software engineering experience with a track record of architecting and delivering complex applications from concept to production

• Expert-level proficiency in Python for backend services and data pipelines, including frameworks such as FastAPI, Pydantic, and async patterns

• Strong proficiency in TypeScript and React for building production-grade frontends, with solid understanding of state management, performance optimisation, and modern component architectures

• Solid database skills including relational (PostgreSQL, SQL Server) and NoSQL (Cosmos DB, Redis) with experience in query optimisation and data modelling

• Comfortable working with AI-assisted development tools (e.g. Claude Code, GitHub Copilot) to accelerate delivery of production-grade code

• Experience with CI/CD tooling (GitHub Actions or Azure DevOps), containerisation (Docker), and Infrastructure as Code concepts (Terraform preferred)

• Working familiarity with Azure cloud services - particularly Azure App Service, Azure Functions, and Azure Container Apps - sufficient to design and deploy solutions within our existing Azure estate

Desirable Technical Skills

• Genuine interest in AI/LLM technologies with some hands-on experience integrating APIs (e.g., OpenAI, Azure OpenAI) into applications

• Familiarity with RAG patterns, vector search, and document processing pipelines for AI-enhanced applications

• Experience with data engineering tooling such as Microsoft Fabric for building analytics and reporting pipelines

• Experience implementing secure authentication and authorisation patterns (OAuth 2.0, managed identities) in cloud-native applications

• Familiarity with container orchestration beyond basic Docker (e.g. Kubernetes, AKS)

Personal Qualities

• Strong architectural thinking with the ability to balance pragmatic delivery against long-term technical vision; comfortable making and communicating trade-off decisions.

• Genuine passion for mentoring and knowledge sharing; someone who raises the technical bar for the entire team rather than working in isolation.

• Intellectually curious and self-directed; stays current with the rapidly evolving technology landscape including AI/LLM developments, and proactively brings new ideas and approaches to the team.

• Effective communicator who can translate complex technical concepts for non-technical stakeholders and contribute to client-facing discussions with clarity and confidence.

Preferred Background

Previous experience in an MSP, consultancy, or multi-client environment where you delivered solutions across varied industries and technical landscapes

• Private healthcare and dental cover

• Perkbox benefits platform and Garmin smartwatch

• Funded training and certification

• Modern Warrington HQ with breakout spaces, games console, pool table, premium coffee and an office dog

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