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Senior Software Engineer
Posted 5 days ago by Gravitas Recruitment Group (Global) Ltd
£500 Per day
Outside
Hybrid
London Area, United Kingdom
Summary: The Senior Fullstack Engineer role involves taking responsibility for core backend systems in a high-growth, AI-driven product business. The position requires a strong focus on system reliability and the ability to operate independently in a fast-paced environment. The ideal candidate will have experience with Node.js, GraphQL, and building high-concurrency systems, while also contributing to product direction. This role emphasizes ownership and initiative in the development process.
Key Responsibilities:
- Take responsibility for core backend systems.
- Help shape product direction in a fast-moving environment.
- Build high-concurrency, event-driven systems.
- Ensure system reliability through monitoring, alerting, logging, and testing.
- Demonstrate ownership of features or systems end-to-end.
- Make progress in environments with evolving or incomplete requirements.
- Balance speed with long-term maintainability in delivery.
- Operate effectively under pressure or shifting priorities.
Key Skills:
- Strong Node.js and GraphQL (NestJS) experience.
- Proficiency in PostgreSQL, Prisma, and solid data structures/OOP fundamentals.
- Experience building high-concurrency, event-driven systems.
- GCP experience (Terraform desirable).
- Experience working with AI/LLMs in production environments.
- Strong focus on system reliability.
- Proven ability to operate independently.
- Experience in building, launching, or scaling a product or meaningful side project.
Salary (Rate): £500 daily
City: London
Country: United Kingdom
Working Arrangements: hybrid
IR35 Status: outside IR35
Seniority Level: Senior
Industry: IT
Senior Fullstack Engineer £450–500 per day 6 months Outside IR35 London – 2 days per week on site We’re supporting a high-growth, AI-driven product business building a scalable platform from the ground up. They operate as a small, high-calibre team with high standards, low bureaucracy, and real ownership. They’re looking for a Senior Fullstack Engineer (back end leaning) to take responsibility for core backend systems and help shape product direction in fast-moving environment. This is a role for someone who is comfortable building without perfect specs and takes initiative naturally.
Requirements
- Strong Node.js and GraphQL (NestJS) experience
- PostgreSQL, Prisma, and solid data structures / OOP fundamentals
- Experience building high-concurrency, event-driven systems
- GCP experience (Terraform desirable)
- Experience working with AI/LLMs in production environments
- Strong focus on system reliability (monitoring, alerting, logging, testing, incident-aware design)
- Demonstrated ownership of features or systems end-to-end, with the ability to operate independently
- Comfortable making progress in environments with evolving or incomplete requirements
- Pragmatic approach to delivery — able to balance speed with long-term maintainability
- Proven ability to operate effectively under pressure or shifting priorities
- Ideally has built, launched, or scaled a product, startup, or meaningful side project