Crafting Interfaces
Worth Exploring

Senior software engineer specialising in fast, accessible, memorable experiences.

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Jack Winter
NAME Jack Winter
CLASS Senior Software Engineer
LEVEL
LVL 15
REGION Remote / London

Origin Story

A software engineer spawned in the wild, trained through years of production battles. Specialises in crafting interfaces that feel alive, fast, accessible, and worth exploring. Armed with a full stack of modern tools and a hunger for pixel-perfect execution.

Veteran of countless sprint reviews, debug marathons, and late-night deploy runs. When not hunting performance regressions or wrangling design tokens, can be found building side projects that push the boundaries of what a browser can do.

Quest Log

  1. Senior Frontend Developer

    ACTIVE

    KTO

    2025 – Present

    • Led the frontend takeover of the Sportsbook platform, replacing Kambi’s hosted UI with a fully custom React-based, Typescript solution.
    • Migrated legacy Javascript code to a TypeScript monorepo with shared packages, improving scalability and developer efficiency.
    • Delivered real-time, data-driven UI features using event-based integrations, enabling live updates for odds, betslip, and open bets.
    • Performance improvements through targeted optimisations (rendering strategy, preloader behaviour, DOM stability), reducing perceived load time.
    • Reduced unnecessary re-renders by refactoring complex UI structures, improving runtime performance across high-traffic components.

  2. Senior Angular Developer

    GeoGaming Group

    2023 – 2025

    • Led performance optimisations, reducing load times by 30% and improving overall UX.
    • Developed and modernised frontend architecture, introducing efficient bundling strategies and lazy loading to optimise performance.
    • Enhanced unit test coverage from 25% to 75%, implementing Jest and Cypress for end-to-end and integration testing.
    • Designed and developed dynamic, real-time UI components using RxJS, WebSockets, and REST APIs for seamless data streaming.
    • Mentored junior developers, conducting code reviews and promoting best practices in frontendengineering.

  3. Senior Software Engineer

    Smartstream Technologies

    2017 – 2022

    • Led the development of a greenfield Angular front-end project, replacing a legacy system and enabling the acquisition of two high-profile deals.
    • Designed and developed in-house tools using React and Node.js to streamline internal workflows,improving team efficiency.
    • Conducted interviews for candidates across junior to senior developer roles.
    • Developed a machine learning model prototype for improving transaction forecast accuracy, resulting in reliable predictions for banking clients.
    • Collaborated closely with DevOps teams to resolve critical system issues, ensuring 24/7 reliability byproviding on-call support.

Project Dex

WinterBot

#001

A GBA-inspired interactive portfolio site built with Astro and Tailwind v4. Fire/Leaf dual theme system.

  • Astro
  • TypeScript
  • Tailwind
  • Playwright
GitHub Live

brain-cache

#002

A local context engine for Claude Code via MCP. It indexes your codebase using AST-aware chunking and a call graph.

  • NodeJS
  • TypeScript
  • LanceDB
  • Ollama
  • Vitest
  • Zod
GitHub Live

FPL Radar UI

#003

A web app for viewing and analysing your Fantasy Premier League (FPL) mini-league.

  • React
  • Tailwind
  • Storybook
  • CVA
  • CSLX
  • Pnpm
  • Vite
  • Playwright
GitHub IN PROGRESS

Inventory

  • TypeScript
  • JavaScript
  • React
  • Angular
  • Astro
  • Tailwind
  • CSS
  • HTML
  • Node.js
  • Fastify
  • Express.js
  • Go
  • Java
  • Spring
  • PostgreSQL
  • Git
  • Docker
  • AWS
  • Webpack
  • Babel
  • Vite
  • Storybook
  • Cypress
  • Mocha
  • Playwright
  • Linux
  • Figma

Rest Area / Save Point

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