Developer (Full Stack - Mid Weight) in London

The Flash Pack partners with some of the world's leading agencies and brands to create innovative installations and engaging experiences that inspire excitement and drive physical and digital interaction. Our dynamic in-house team of creatives, technologists, developers, fabricators, and producers collaborates seamlessly to deliver exceptional value to our clients quickly. We are committed to pushing creative boundaries and turning ideas into impactful realities.

As a Full-Stack Developer at The Flash Pack, you'll be central to building the software that powers our immersive experiences, from RFID-driven capture journeys and AI image pipelines to the proprietary platforms our team uses every day to run live productions. Successful candidates will be comfortable contributing production-ready code across the stack, happy working on varied and exciting but often high-pressure projects. You’ll be naturally curious about how things fit together, from a Vue component all the way through to the kiosk hardware on a venue floor. AI is a first-class part of how we build. You will use AI coding tools as part of your day-to-day development.

You will work closely with and be supported by our Senior Developer and Technical Advisor, who will provide technical direction, mentorship, and oversight across projects and platform development. You will also be working closely with the wider team of 12 made up of Technicians, Creatives & Producers. We work in live events so some out-of-hours support will be required, but this is planned in advance by our producers and kept to a minimum and shared across the team. You will have a helpful, ‘can-do’ attitude to foster a positive team environment. This role offers a clear path to developing into a senior full stack developer, with exposure to a wide range of technologies including AI, hardware integration, and live production systems. We don’t expect candidates to have experience across every area of our stack and workflows - curiosity, adaptability, and a willingness to learn are just as important.

Essential Skills / Requirements

• Solid full-stack experience, comfortable across modern JavaScript frameworks (Vue, React or similar) and Python web backends (FastAPI, Flask, Django or similar).
• Strong understanding of RESTful APIs, WebSockets and handling live data updates in the UI.
• Working knowledge of databases (MongoDB, Postgres or similar).
• Demonstrable, day-to-day experience using AI coding tools such as Claude, Codex, Cursor or Copilot, and a clear view on how to use them well.
• Comfortable fulfilling UI and frontend briefs using AI-assisted workflows, with the judgement to know when to lean on AI and when not to.
• A pragmatic, ship-it mindset, happy iterating fast, comfortable with ambiguity, and willing to learn what you don’t yet know.
• Clear written and verbal communication. You can explain technical decisions to non-technical producers and clients.

Responsibilities

• Building and shipping features across our VueJS frontends and FastAPI backends, from customer-facing interfaces to admin dashboards.
• Supporting producers on breaking down briefs, translating production requirements into working features, including UI work informed by design briefs and AI-assisted iteration.
• Adding features and continuously optimising and supporting the ongoing development and improvement of Airtime, our proprietary internal platform, alongside our Senior Developer.
• Contributing to our AI image pipelines (Gemini, background removal, upscaling, rendergraph compositing) and helping productionise new models as they emerge.
• Working alongside our technicians where required to integrate custom hardware, RFID readers, payment terminals, Raspberry Pi’s, Arduino’s and NUC’s.
• Providing planned, scheduled remote support during live events, coordinated by our producers in advance.
• Helping establish and refine best practices for AI-assisted development across the team.
• Communicating clearly with colleagues and partner tech teams about requirements and specifications.

Bonus Skills

• Experience with experiential, interactive or event-based technology.
• Hands-on familiarity with hardware integration: RFID, payment terminals, thermal printers, kiosk PCs.
• Production experience with generative AI APIs and image pipelines (Gemini, Stable Diffusion, ComfyUI or similar).
• Experience with FFmpeg or other media processing tools.
• Experience of designing and deploying services on AWS.
• Experience with Linux systems: basic bash scripting, terminal text editing, OS and package installation, network configuration.

Package

• Salary Range £40-45k DOE.
• Holiday: 25 days, plus an additional day for each year in service up to 28 days.
• Pension Plan: Employee’s contribution 5% with tax benefits; employer contribution 3%.
• Healthcare Cash Plan: Cashback on everyday healthcare expenses, up to an annual limit of £640.
• Employee Assistance Program: Confidential helpline and counseling support for wellbeing.
• 24-Hour GP Service and Personal Accident Insurance cover up to £20k.
• Hybrid working: 2–3 days a week in our London office.