Back End Developer (Senior)

Salary £80k to £120k plus Quarterly bonuses

Role Description

We are seeking a talented Senior Backend Engineer to join our London-based team full-time. You will play a key role in building and scaling the core infrastructure of our AI platform, owning critical backend systems, and supporting rapid product growth.

This is a high-impact, fast-paced role with significant autonomy, where your work will directly influence product direction and user experience.

Key Responsibilities

• Design and implement backend services and APIs using Python, FastAPI, and Django
• Build and maintain scalable RESTful APIs with PostgreSQL
• Develop and integrate AI/LLM-powered features using frameworks such as LangChain
• Implement and manage payment systems, including Stripe integrations and subscription flows
• Build image processing and computer vision pipelines
• Write clean, maintainable, and well-documented code deployed via Docker and CI/CD pipelines
• Collaborate using GitHub, maintaining high code quality and team standards
• Work with BaaS platforms (e.g., Supabase) for authentication, storage, and real-time functionality
• Ensure performance, scalability, and security best practices
• Collaborate cross-functionally with Product, Design, and Frontend teams
• Contribute to architectural decisions and mentor other engineers
• Develop data-driven backend services and pipelines
• Support production systems and deployments within a small, high-performing team

Qualifications

• 5+ years of professional software engineering experience
• Strong Python expertise with backend development experience
• Proven experience with FastAPI and/or Django, REST APIs, and PostgreSQL
• Experience integrating Stripe for payments and subscriptions
• Familiarity with image processing and computer vision
• Experience with Docker, GitHub, and modern deployment workflows
• Knowledge of cloud platforms (AWS, GCP, or Azure)
• Strong understanding of software design principles (SOLID, patterns, clean code)
• Experience with BaaS platforms such as Supabase or Firebase
• Ability to thrive in fast-paced, high-ownership environments

Nice to Have

• Experience with LLM APIs (e.g., OpenAI, Anthropic, Gemini) and LangChain
• Background in AI/ML (e.g., generative models, GANs, diffusion, regression)
• Experience building data pipelines and data-driven systems
• Familiarity with workflow orchestration tools (e.g., Temporal, Prefect)

Why Join

• Be part of a fast-growing company in the AI and consumer tech space
• High ownership and autonomy over technical decisions
• Work closely with founders and a mission-driven team
• Strong market traction and growth potential
• Opportunity to shape a rapidly evolving industry

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