Johannes Engl
Freelance Software Engineer with 10+ years experience building cloud native applications – Ruby on Rails, AWS, Golang
Experience
Senior Software Engineer
Deliveroo
Geo-Sharding different ruby services. Planning and executing a project to allow the company to process more orders at peak time by launching a second amazon aurora database cluster and offloading high-volume tables with billions of rows to the new cluster. Through this, absolute CPU usage during peak hours was successfully decreased on average by 15.79%.
Skills: Ruby on Rails · AWS · Kafka · Microservice Architectures · BigData · Terraform · Datadog · Protocol Buffers
Senior Software Engineer
Monograph
Consulting the engineering team on system architecture and best practices around development workflows and processes. Mentoring team members and building features in Ruby on Rails.
Skills: Ruby on Rails · GraphQL
Team Lead Growth Engineering
Tourlane
Led the Growth Engineering team, responsible for building customer-facing web applications for lead generation and ad-tech products. The team consisted of seven Engineers and one Product Manager. Led initiative to extract the SEO pages into a microservice in a serverless way using gatsby. The extract resulted in a performance improvement of 3x for time to interact with the website.
Skills: Ruby on Rails · AWS · Kafka · Microservice Architectures · Ad Tech · A/B Testing · Docker · Snowflake · Terraform
Senior Software Engineer
Tourlane
Built a tracking infrastructure using Apache Kafka. Introduced a last-click attribution model and created marketing reports. These initiatives led to data-driven decisions in marketing across the company. Calculated target cost per acquisition for paid marketing (based on historical data) to increase the efficiency of SEM ads.
Lead Developer
Airgora
Developed technology and led product iterations from the first prototype to release, reaching the product-market fit.
Skills: Ruby on Rails · React.js
Co-Founder & CEO
99trips
TravelTech startup offering a one-stop shopping experience for technology-based curated city trips with 10k+ registered users and 10k+ € sales. Developed technology and managed a team of five people.
Skills: AngularJS · Ruby on Rails · AWS
Co-Founder & Board Member
NGO KAJO e.V.
Founded the association (+30 members), raised 50k+ € in donations benefiting education in Ethiopia. Organized and executed projects on site in Addis Ababa, Ethiopia.
Open Source Contributor
Contributor at the open-source framework ViewComponent initially built by Github. The framework adds functionality for building view components that are reusable, testable & encapsulated, in Ruby on Rails.
Summary
Geo-Sharding different ruby services
Planning and executing a project to allow the company to process more orders at peak time by launching a second amazon aurora database cluster and offloading high-volume tables with billions of rows to the new cluster
Through this, absolute CPU usage during peak hours was successfully decreased on average by 15.79%
Consulting the engineering team on system architecture and best practices around development workflows and processes
Mentoring team members and building features in Ruby on Rails
Led the Growth Engineering team, responsible for building customer-facing web applications for lead generation and ad-tech products
The team consisted of seven Engineers and one Product Manager
Led initiative to extract the SEO pages into a microservice in a serverless way using gatsby
The extract resulted in a performance improvement of 3x for time to interact with the website
Built a tracking infrastructure using Apache Kafka
Introduced a last-click attribution model and created marketing reports
These initiatives led to data-driven decisions in marketing across the company
Calculated target cost per acquisition for paid marketing (based on historical data) to increase the efficiency of SEM ads
Languages
Education
University of Applied Sciences HTW Berlin
Bachelor of Science · International Media and Computing · Berlin, Germany
Certifications & licenses
Certified ScrumMaster
Scrum Alliance
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