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Callum Jefferies

Staff product engineer · Remote / London hybrid

Over the last 15 years I’ve built user-centric digital products and services in sectors such as healthcare, media, hospitality, music, sport and education and, most recently, product development and supply chain management tools.

Product management is as much a part of my work as engineering. I shape what gets built, from the first customer conversations through to pitching leadership for investment. I then lead the team to build it, working closely with sales, marketing, data analysts, product managers and designers. I’m as comfortable proving the value of something new as I am making it fast, accessible and robust enough to scale.

With a degree in visual communication, I design as well as build. I’m particularly interested in how user experience shapes the business/consumer relationship, and I’ve developed a clear sense of what it takes to make a digital product people trust and want to use.

Skills

Experience

  1. Miro – 2022–present

    Staff engineer

    • Forward deployed engineering, supply chain:
      Led product discovery and development of a suite of supply chain products, shaped with its first client, a global aerospace manufacturer, on a multi-million-dollar deal. Worked with the client on-site in the US and remotely, running workshops, building prototypes and iterating on feedback. Then partnered with another solution team at Miro to build a platform behind it, opening up a pipeline of similar deals.

    • Journey Management:
      Led discovery and prototyping for journey mapping in Miro. My proof of concept went out to enterprise design partners and led to a dedicated team being formed to take it to general availability.

    • Tables, Timeline and Planner:
      Built features that took Miro into new territory as a tool for product teams. Led development of Planner, a planning board with two-way Jira and Azure DevOps sync, and of Timeline, from first prototype to general availability. Helped shape Tables in its early stages, then built SDK foundations that let other teams build on Tables as a platform.

    • Performance and accessibility:
      Made card dragging 90% faster in Planner and raised Timeline dragging from around 10 to 100 frames per second. Co-developed accessibility tooling for Miro’s in-house canvas engine, making Tables and Timeline usable by keyboard and screen reader.

  2. Qualdesk – 2020–2022

    Software developer

    A startup building a collaborative whiteboard for product teams, acquired by Miro in 2022.

  3. Made by Many – 2012–2020

    Software developer

    • Carlsberg Adapt:
      In collaboration with a team of data scientists, I helped create a service that delivered weekly insights to bar owners derived from previously unused data sources. Responsibilities included Elixir/ React /GraphQL/ Python development, design/UX, and working abroad in Lisbon to transfer the project to Carlsberg’s team.

    • Victoria and Albert Museum:
      Ruby on Rails/ JavaScript development, design/UX, business/visitor research, and skills transfer to V&A team to rebuild the main website, events calendar and shop. Working with the V&A’s content team, I designed and built tailored editorial tools.

    • UMG Composed:
      My first foray into React in 2014, I led development of an API driven single-page app for browsing and streaming classical music in the browser.

    • Bloop:
      Carried out customer/product research, technical investigation and prototyping to create a new service for diabetes sufferers.

    • Mentoring:
      Guided a junior member of the team to grow their skills and confidence in order to take on new responsibility.

  4. The House London – 2011–2012

    Designer/developer

  5. The Arts Institute at Bournemouth – 2008–2011

    BA (Hons) Visual Communication, 2:1

Open source/ personal projects