Christian Lerke, Developer in Puerto de la Cruz, Spain

Christian Lerke

Software Developer

Puerto de la Cruz, Spain
Toptal Member Since
April 1, 2019

Christian is a senior developer and entrepreneur with over a decade of professional experience building full-stack solutions. As the co-founder and tech team lead of his own startup, he has learned the importance of iterating quickly, and delivering results on time.

Christian is available for hire
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Home Run (Convibo, Ltd.)
Amazon Web Services (AWS), Stripe, Elasticsearch, Memcached, Redis, PostgreSQL...
Heroku, Swift, wkhtmltopdf, PostgreSQL, Ruby on Rails (RoR), Ruby


Puerto de la Cruz, Spain



Preferred Environment

GitHub, Sublime Text, MacOS

The most amazing...

...system I've built was an on-demand grocery picking, and delivery platform, with in-store route optimization, live out-of-stock replacement, and order tracking.

Work Experience

2014 - 2019

Co-founder and Chief Technology Officer

Home Run (Convibo, Ltd.)
  • Built a bespoke commerce platform from scratch, allowing customers to shop from multiple supermarkets, and get their groceries delivered in as little as one hour.
  • Created an intelligent order management system assigning orders to shoppers, and drivers as well as a capacity management system to make sure all orders would be delivered on time.
  • Built a self-learning, out-of-stock replacement recommendation system tailored to every customer to decrease the time lost in communicating potential replacement options to customers.
  • Developed systems for multi-order picking as well as in-store route optimization to increase shopper efficiency.
  • Created a real-time operations management dashboard, tools to manage orders, and track employees’ progress, and current location.
  • Built product catalog integrations with UK’s largest supermarkets.
  • Led the tech team.
Technologies: Amazon Web Services (AWS), Stripe, Elasticsearch, Memcached, Redis, PostgreSQL, Ruby on Rails (RoR), Ruby
2004 - 2019


  • Created a bespoke, multilingual medical invoicing application for a clinic.
  • Built dynamic lab analysis reports for pattens to explain the meaning of their current results, rather than a generalized explanation per parameter.
  • Developed a bespoke Mac app to simplify tracking services provided to patients, and invoicing them.
Technologies: Heroku, Swift, wkhtmltopdf, PostgreSQL, Ruby on Rails (RoR), Ruby


Shopping with Pat
This app is an intelligent meal planner, and takes into account your preferences, and the people you're cooking for to build a tailored meal plan. This helps reduce waste, and save you money by reusing leftover ingredients from previous meals later in the week.

I built the back end of this project allowing for the input of all the recipes and ingredients as well as the underlying logic to construct the meal plans.

This project was executed in less than two months from start to finish.



Ruby, HTML, JavaScript, SQL, CSS, Sass, Haml, Swift


Ruby on Rails (RoR), Bootstrap, Factory Girl


PostgreSQL, Memcached, Redis, MySQL, Amazon S3 (AWS S3), Elasticsearch, SQLite


jQuery, Stripe API, Facebook API, Sidekiq, Google Maps API, Google Chart API, Slack API, Intercom API, Nokogiri, Stripe, React, Google APIs, Telegram Bot API, Zendesk API, Backbone.js, Backbone.Marionette, Moment.js, Underscore.js, Devise


Amazon EBS, Slack, SendGrid, Mailchimp, wkhtmltopdf, Sublime Text, GitHub, MATLAB, Capistrano, RSpec


Amazon EC2, Adobe Suite, Ably, Mandrill, MacOS, Heroku, Amazon Web Services (AWS), Linux


Agile Software Development


Mailchimp API


2013 - 2014

Master's Degree of Science in Innovation and Entrepreneurship

University of Warwick - Coventry, United Kingdom

2009 - 2013

Bachelor's Degree of Science (Honors) in Robotics

University of the West of England - Bristol, United Kingdom