Senior Full-Stack Developer in London - Slipcase

Java Script Works; London; Hybrid; GBP 40,000 - 70,000; Full time

Job summary

A leading company seeks a full-stack developer to take ownership of their mature platform and lead its evolution. You will work closely with a dynamic team to design, build, and ship features, ensuring high performance and security. This role offers real autonomy and the chance to shape the tech team while collaborating with external partners for larger projects.

Benefits

Flexible work setup

Real autonomy in product development

Opportunity to shape the tech team

Qualifications

• Experience writing clean, PSR-compliant, SOLID code.
• Confident working independently, from scoping out features to pushing them live.
• Experience with full-stack development, especially in the specified tech stack.

Responsibilities

• Driving the evolution of the web platform and native apps.
• Leading development on new product features, from concept to deployment.
• Supporting API integrations and backend systems.

Skills

Problem Solving

Full-stack Development

Clean Code

Performance Optimization

Data Security

Tools

PHP

MySQL

AWS

Docker

TypeScript

Job description

The Role

For the past 8 years, we have worked in partnership with a top-tier development agency to bring our vision to life and oversee the maintenance of our systems. We’re now looking for our first in-house developer to join our team; a confident, capable full-stack engineer ready to take ownership of a mature, production-ready platform and lead it into its next chapter. You’ll be at the heart of the product, working alongside a dynamic and entrepreneurial team to design, build, and ship features that thousands of professionals rely on every day. You won’t be alone; we’ll continue working with our long-term agency partner on larger projects and DevOps support. But day-to-day, you’ll be the key technical voice in the room. This is a unique opportunity to shape the future of Slipcase tech from the inside out.

What You'll Be Working On

• Driving the evolution of our web platform and native apps
• Leading development on new product features, from concept to deployment
• Supporting API integrations, backend systems, and our internal machine-learning engine
• Working directly with the business team to translate needs into scalable code
• Balancing quick iteration with smart architecture and long-term maintainability

Our Tech Stack

• PHP (Symfony) + MySQL + Twig
• Native Android & iOS apps connected via a TypeScript REST API
• Hosted on AWS with Docker containers + CDK orchestration
• A custom-built machine learning/NLP engine for smart content curation
• Integration with multiple third-party APIs for distribution and analytics

About You

You’re not just a developer —you're a problem solver, architect, and tech lead rolled

into one.

• Experience writing clean, PSR-compliant, SOLID code
• Confident working independently, from scoping out features to pushing them live
• Experience with full-stack development (especially in our stack!)
• Keep performance, uptime, and data security top-of-mind
• Comfortable updating documentation, expanding test coverage, and helping with our ISO27001 compliance journey where needed.

Bonus Points if you:

• Have got AWS certifications or strong hands-on experience with AWS tools
• Are open to manage occasional out-of-hours deployments (with the freedom that comes with it!)

What We Offer

• The chance to own and evolve a mature, production-ready platform
• Real autonomy and input into the product roadmap and technology choices
• A flexible work setup (hybrid, or office-first - you decide)
• Be the first in-house dev and help shape the future tech team
• Work at a company where tech is at the heart of the business, not an afterthought
• Lead developer, but with the support and experience of a team of experts by your side.