Principal Full Stack Engineer (React/.NET/Agentic AI) - 6 months contract
Posted 1 week ago by Jobserve
£900 Per day
Outside
Remote
United Kingdom
Summary: The role of Staff/Principal Full Stack Engineer is a contract position focused on rebuilding and modernizing a core CRM product within a product-led organization. The engineer will work in a collaborative environment, engaging closely with business stakeholders and senior leadership to drive product evolution. This position requires a hands-on approach in both front-end and back-end development, emphasizing a pragmatic and outcome-focused mindset. The contract is for 6 months, offering a competitive daily rate and fully remote working arrangements within the UK.
Key Responsibilities:
- Rebuild and enhance existing CRM features within a live production system
- Work end-to-end across Front End and Back End systems
- Partner closely with engineering leadership to understand product direction and priorities
- Turn business problems into pragmatic technical solutions
- Ship iteratively, build, share, improve
- Contribute to technical direction as the team scales
Key Skills:
- Senior/Staff-level Full Stack Engineer with strong product mindset
- Experience working in brownfield systems and modernising existing platforms
- Comfortable operating beyond code, able to engage with the business and explain trade-offs
- Strong communication skills and confidence working with non-technical stakeholders
- Pragmatic approach: focused on outcomes, not perfection first time
- Core technical experience in React (modern Front End development)
- Core technical experience in .NET (Back End/APIs)
- Exposure to Agentic AI/AI-assisted development (eg Claude Code)
- Cloud experience: Azure and/or AWS
Salary (Rate): £900 per day
City: undetermined
Country: United Kingdom
Working Arrangements: remote
IR35 Status: outside IR35
Seniority Level: Senior
Industry: IT
Detailed Description From Employer:
UK | Fully Remote (UK-based)
Staff/Principal Full Stack Engineer (Contract)
6 months | £900 per day (Outside IR35)
High-growth Product Engineering Team
Build and evolve a core CRM product used across the business
We're supporting a product-led organisation that is rebuilding and modernising key areas of an existing CRM platform.
This role suits an experienced contractor who enjoys working in brownfield environments, partnering closely with the business, and shaping how a product evolves rather than just delivering tickets.
You'll operate as a senior, hands-on engineer within a growing engineering group, working closely with senior leadership to take the product from where it is today to where it needs to be next.
The role
This is a product-focused engineering position, not a pure delivery role:
- Rebuild and enhance existing CRM features within a live production system
- Work end-to-end across Front End and Back End systems
- Partner closely with engineering leadership to understand product direction and priorities
- Turn business problems into pragmatic technical solutions
- Ship iteratively, build, share, improve
- Contribute to technical direction as the team scales
You'll be joining a collaborative engineering group (circa 20 people, growing), with strong access to decision-makers and clear product ownership.
What they're looking for
- Senior/Staff-level Full Stack Engineer with strong product mindset
- Experience working in brownfield systems and modernising existing platforms
- Comfortable operating beyond code, able to engage with the business and explain trade-offs
- Strong communication skills and confidence working with non-technical stakeholders
- Pragmatic approach: focused on outcomes, not perfection first time
Core technical experience:
- React (modern Front End development)
- .NET (Back End/APIs)
- Exposure to Agentic AI/AI-assisted development (eg Claude Code)
- Cloud experience: Azure and/or AWS
Working model & contract details
- 6-month contract (extensions likely)
- £900 per day, Outside IR35
- Fully remote within the UK
- Occasional office attendance may be required