Senior Full Stack Engineer

Sellick Partnership; Bath; Hybrid; GBP 70,000 - 110,000; Full time

Benefits offered by this job

Competitive salary with annual reviews

Enhanced family leave

25 days annual leave + bank holidays

Life assurance

Company social events

Job summary

Sellick Partnership in Bath is recruiting a Senior Full-Stack Engineer for a major UK Defence Programme, with hybrid working (typically three days onsite).

You’ll build full‑stack features, design integrations with ERP and data platforms, primarily using Java, SQL, TypeScript and Angular, and own end‑to‑end delivery while mentoring peers.

Applicants must be UK nationals eligible for UK Security Clearance (SC).

Qualifications

• Experience as a Senior Full-Stack Engineer on complex projects.
• Hands-on with front-end and back-end technologies.
• Experience integrating third‑party platforms or ERP systems.
• Security clearance eligibility (UK SC) is advantageous.

Responsibilities

• Build full-stack features across user-facing applications, backend services, APIs and data.
• Design and develop integrations with ERP systems, data platforms and external technologies.
• Work primarily with Java, SQL, TypeScript and Angular.
• Design REST and event-driven APIs and integrations.
• Introduce event-driven and CDC patterns where appropriate.
• Work with data warehouse/lakehouse environments and real-time data flows.
• Make architectural decisions around scalability, security, performance.

Skills

Angular

TypeScript

SQL

REST APIs

Event-driven architecture

CI/CD

Observability

Data design

Mentoring

Job description

Senior Full-Stack Engineer – UK Defence Programme

Bath | Hybrid – typically 3 days onsite

Permanent

UK National / SC Clearance Eligible

We’re looking for an experienced Senior Full-Stack Engineer to join a major, multi-year technology transformation programme within UK defence.

This is a hands‑on engineering role with genuine ownership. You’ll be building and evolving a complex software platform while integrating it with a growing ecosystem of systems including data lakehouse technology, ERP platforms, optimisation engines and external partner platforms.

A lot of the technical landscape is still being designed, so we’re looking for someone comfortable taking loosely defined requirements, shaping the solution with the wider team and delivering it end‑to‑end.

What You’ll Be Doing

• Build full-stack features across user‑facing applications, backend services, APIs and data.
• Design and develop integrations with ERP systems, data platforms and external technologies.
• Work primarily with Java, SQL, TypeScript and Angular.
• Design REST and event‑driven APIs and integrations.
• Introduce event‑driven and Change Data Capture (CDC) patterns where appropriate.
• Work with data warehouse/lakehouse environments and near‑real‑time data flows.
• Make architectural and technical decisions around scalability, security, performance and maintainability.
• Improve engineering standards across automated testing, CI/CD and observability.
• Take substantial pieces of work from initial design through to production.
• Mentor other engineers and help develop engineering best practices.
• Work directly with engineers, project managers, designers and senior customer stakeholders.

What We’re Looking For

You’ll ideally be an experienced Senior Full-Stack Engineer who enjoys remaining hands‑on while taking ownership of technically complex projects.

Key experience

• Angular / TypeScript
• SQL
• REST APIs and backend services
• Systems integration
• Event‑driven architecture
• Data warehouse/lakehouse integration
• CI/CD and automated testing
• Observability and production monitoring
• Strong system and data design knowledge
• Experience integrating third‑party platforms or ERP systems

Experience with streaming technologies, Change Data Capture (CDC) or complex data integrations would be particularly useful.

We’re also looking for someone comfortable working with ambiguity. You should be able to understand the underlying problem, make pragmatic technical decisions and take responsibility for delivering the solution rather than relying on a fully defined specification.

Defence & Security Requirements

Due to the nature of the programme, candidates must be UK nationals and eligible to obtain UK Security Clearance (SC).

Existing active SC clearance would be advantageous but is not essential for candidates who meet the eligibility requirements and are willing to undergo the clearance process.

Previous experience within defence, central government, public safety or another regulated environment would also be beneficial.

Location

Bath-based with hybrid working, typically around three days per week onsite at either the company office or customer locations.

• Competitive salary with annual reviews
• Enhanced family leave
• 25 days annual leave plus bank holidays
• Life assurance
• Company social events

Why Consider the Role?

This is an opportunity to take real ownership within a significant, long‑term UK defence technology programme.

Rather than simply working through predefined tickets, you’ll help determine how solutions are designed and built, working across full‑stack development, data and complex systems integration.

You’ll remain hands‑on while having the opportunity to influence architecture, engineering standards and the wider technical direction of the programme.

Interview Process

The process is expected to include:

• Hands‑on programming session

Java is the primary backend technology, although another mainstream programming language may be considered for the technical exercise.