Christian Lerke, Developer in Puerto de la Cruz, Spain
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Christian Lerke

Verified Expert  in Engineering

Software Developer

Location
Puerto de la Cruz, Spain
Toptal Member Since
May 13, 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.

RubyRuby on Rails (RoR)PostgreSQLJavaScriptCSSjQueryMySQLSQLBootstrapAdobe SuiteSassHamlStripe APIFacebook APISidekiqCapistranoTelegram APIUnderscore.jsMATLABSendGridMoment.jsRSpecDevise

Portfolio

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

Experience

Ruby - 15 yearsRuby on Rails (RoR) - 15 yearsJavaScript - 15 yearsPostgreSQL - 10 years

Availability

Part-time

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

Co-founder and Chief Technology Officer

2014 - 2019
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

Developer

2004 - 2019
Freelance
  • 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

https://shoppingwithpat.com
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.

Languages

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

Frameworks

Ruby on Rails (RoR), Bootstrap, Factory Girl

Storage

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

Libraries/APIs

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

Tools

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

Platforms

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

Paradigms

Agile Software Development

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

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