Senior Full Stack Developer

Explore Group; Greater London; Hybrid; GBP 135,000 - 165,000; Full time

Job summary

Explore Group is partnering with a well-funded startup transforming regulated enterprise workflows with AI-first software. We’re seeking a Senior Full Stack Engineer to take ownership of greenfield features from day one, in London with a hybrid work model.

You will work directly with founders and leadership, building end-to-end features across a modern stack, and integrating AI-powered workflows and LLM tooling into core user experiences.

Qualifications

• Startup experience in agile, early-stage environments with autonomy.
• Full-stack proficiency across frontend and backend; Python/React or TypeScript.
• Experience with modern web tooling, type-safe APIs, and responsive UI.
• Interest or experience with AI/LLM pipelines and autonomous agents.
• Cloud deployments (GCP/AWS) and PostgreSQL databases.
• Product-focused mindset delivering reliable, user-friendly solutions.

Responsibilities

• Partner directly with founders and leadership to translate complex domain challenges into scalable, user-centric products.
• Build, test, and ship end-to-end features rapidly across a modern full-stack web and AI architecture.
• Design and implement intelligent agentic workflows and LLM-driven tooling integrated into core user experiences.

Skills

Full-stack development

Python

React/TypeScript

LLM integration

Cloud deployments (GCP/AWS)

PostgreSQL

Tools

GCP

AWS

TypeScript

Job description

Senior Full Stack Engineer (Full-Stack / AI) – London – £150,000 + Equity | Hybrid

Explore Group is partnering with a well-funded, high-growth startup transforming high-stakes, regulated enterprise workflows with modern, AI-first software.

Following substantial investment from leading VCs, they are expanding their core engineering team and seeking a Senior Full Stack Engineer to take full ownership of greenfield feature development from day one.

The Role

• Partner directly with the founders and technical leadership to translate complex domain challenges into scalable, user-centric products.
• Build, test, and ship end-to-end features rapidly across a modern full-stack web and AI architecture.
• Design and implement intelligent agentic workflows and LLM-driven tooling integrated directly into core user experiences.

Key Requirements

• Startup Track Record: Proven experience thriving in agile, fast-paced early-stage environments with a high degree of autonomy.
• Full-Stack Proficiency: Strong production background across both frontend and backend development, ideally using Python / React or Typescript ecosystems.
• Modern Web Tooling: Solid familiarity with modern full-stack architectures, type-safe APIs, and responsive UI frameworks.
• AI & LLM Integration: Practical experience or demonstrable interest in building with modern LLM pipelines, autonomous agents, and context-aware systems beyond basic API calls.
• Systems & Cloud: Good grounding in event-driven patterns, background worker queues, cloud deployments (GCP/AWS), and relational databases (PostgreSQL).
• Product Focus: Strong product sense with an instinct for delivering reliable, elegant solutions to genuine end-user friction points.