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Robert Johnson

Clojure Developer
  • Suggested rate
    £500 / day
  • Experience8-15 years
  • Response rate100%
  • Response timeA few days
The project will begin once you accept Robert's quote.
Location and workplace preferences
Location
Southampton, United Kingdom
Remote only
Primarily works remotely
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Languages
Check out languages spoken by Robert
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Skill set
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Industry fields of expertise
Banking and Financial Services
Robert in a few words
I am a Senior Software Engineer with 14 years of experience, during which I have primarily worked on back-end systems. I have used a variety of technologies: FP & OO programming languages; relational & NoSQL DBs; traditional message brokers such as ActiveMQ and distributed event log systems such as Kafka; manual deployment of uberjar apps and modern containerised apps deployed onto Kubernetes.

As keen as I am on technology, I appreciate the importance of good communication, team dynamics and planning in order to build excellent software. I am a strong advocate of knowledge sharing, ensuring that I and my colleagues don’t become knowledge silos by writing wiki articles and highlighting where others should do the same. I take a lead in planning work by writing design docs and work tickets, splitting down and prioritising work to tackle risks early and ensure steady progress. I work together with product and engineering managers to clarify requirements and priorities, and summarise technical problems for the benefit of non-technical stakeholders.

I have combined my interests in Clojure and writing by creating a tech blog at One of my more popular articles - a critique of a config library usage pattern - has already been recommended within the Clojure community.
Experience
  • Funding Circle UK
    Senior Engineer
    August 2021 - Today (3 years and 6 months)
    I work remotely on Kafka-driven back-end systems written in Clojure and hosted on Kubernetes. Initially I worked on our "decision engine" for assessing loan applications, which makes extensive use of the Clara Rules library. I now work on our line-of-credit product offering, which involves working on a number of smaller Kafka Streams services which involve collaboration with 3rd-party web APIs relating to card payment services. Alongside my day-to-day duties, I regularly conduct the technical segments of our interview process, am on the out-of-hours on-call rota responding to production incidents, and have mentored junior developers
    ● To progress a rounding issue with no quick complete solution, I researched & implemented approaches, analysed and measured results, created graphs, and presented options to help non-technical stakeholders decide on the best approach to take forward
    ● Introduced generative testing to a service to cover gaps in our test coverage for Kafka message serialisation issues
    ● Have created & distributed Emacs plugins & Babashka scripts to assist with common development and support tasks
  • WonderLane
    Senior Software Developer
    July 2019 - July 2021 (2 years)
    Bournemouth, England, United Kingdom
    Within a small close-knit company of around 30 people, I was a team tech lead of a sprint team of a few developers. I reported directly to our company directors on project progress, and often liaised with contacts from our key client, a large corporation in Dubai. Our main project was an electronic point-of-sale system involving Linux-hosted microservices written in Go and Android applications which ran on handheld payment terminals.
    ● Delivered projects within expected timescales by frontloading the integration of riskier elements such as new hardware/firmware modules & 3rd-party APIs, enabling this by initially implementing intermediary components with prototype code where needed
    ● Fixed a significant performance issue related to an obscure firmware bug, during which I gave regular written and verbal updates to both internal & external stakeholders
    ● Set up test environments on AWS EC2 to replace ageing in-office test servers
    ● Created & internally distributed a script to provision creation of a VM-based local test environment in order to provide developers with a faster test feedback loop
    ● Introduced unit tests to areas of the system with little to no unit test coverage
  • JPMorgan Chase & Co.
    Software Engineer
    June 2018 - July 2019 (1 year and 1 month)
    Bournemouth, UK
    I was part of an agile team that used Java to write extract-transform-load programs for the purposes of internal tax reporting. We used TDD, BDD and pair programming as standard practice, and we aimed to use Java in as much of a functional programming style as possible.
    ● Led a team of summer interns in writing an exploratory side project
    ● Led "lunch and learn" sessions on TDD
    • Check out Robert's experience
Recommendations
Education
  • Bachelor of Science in Mathematics
    University of Warwick
    2009
    Bachelor's Degree, Mathematics, 1st class honours