Backend Developer

Location: London, UK
Salary: £50,000 - £55,000 + options

About the role

If you’re excited about empowering individuals, helping organisations to work better together, and creating a platform to power the future of work, this is the place to do it. Kalido exists to help create a world where people and organizations can maximize potential through a global community of valued connections and opportunities. We passionately problem-solve new ways to do this, no matter how difficult the challenge. Everyone on our team is a true product owner, responsible for ensuring excellence. We move fast (but thoughtfully), and are looking for a talented and impact-oriented Backend Developer to join us.

In this role, you will be building and maintaining the infrastructure at the very heart of Kalido, and ensuring that it is secure, performant, easily deployable, scalable, cost-effective, and fit for purpose. In doing so, you will shape the company, and our collective ability to impact the world.

As part of a startup, your responsibilities will vary, but on a day to day basis, you will:

Build Kalido

  • Collaborate with cross-functional teams to define, design, and build new functionality as required, using, clean and efficient code
  • Design, build and refactor our architecture as we evolve, with maintainability and efficient abstraction in mind
  • Verify, test and deploy new build
  • Work with, learn from and challenge senior developers

Maintain Kalido

  • Troubleshoot, debug and enhance the existing codebase, driving towards a continuously more performant, higher quality, and responsive experience
  • Monitor and analyse system performance, and own our uptime
  • Troubleshoot, debug and maintain the existing DevOps deployments
  • Refine and extend our administrative and performance monitoring tools
  • Optimize our use of processing power, memory, storage,bandwidth, and third-party API calls in our backend infrastructure

What we are looking for

We value inclusion, impact, transparency, generosity, and teamwork. You can read more about our values and what they mean to us here. We are looking for someone who: shares our philosophy; is capable and excited about the role; strives for personal and professional excellence; and wants to make a meaningful difference through their work.

This opportunity is for you if you are:


  • Experienced in development and backend systems building, with a strong analytical mind and an ethical approach to dev
  • Comfortable with the fundamentals of Computer Science and Information Architecture, including knowledge of data structures, algorithms, their complexities, their tradeoffs, and their implementation (e.g. trees, graphs, sorting algorithms, and their various Big O implications)
  • Excited about thoughtfully building scalable platforms
  • Knowledgeable about systems architecture choices and performance trade-offs, database design and extensibility
  • Capable of writing SQL queries for Oracle and Postgresql
  • Skilled in Golang
  • Comfortable developing and maintaining systems written in Golang, Javascript and Python, using unit testing, and managing version-controlled development using continuous integration and devops tools (e.g. Travis). Working knowledge of a wide variety of languages and frameworks is preferred.
  • A good listener, willing and able to act on constructive feedback
  • A strong collaborator, able to establish strong relationships with other development teams, and to proactively keep teammates in the loop on progress and issues
  • A creative thinker, able to investigate and solve complex product challenges
  • A clean, conscientious and forward-thinking coder
  • Keen to take initiative wherever an aspect of the in-app experience, feature, development process, or culture can be improved