Freelance Software Engineer with 10+ years experience building cloud native applications – Ruby on Rails, Golang, AWS
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- 1 Referenz
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- 10247 Berlin
- Europa
- de | en | es
- 01.02.2024
Kurzvorstellung
- Ruby on Rails
- Golang
- AWS Cloud Computing
- Microservice Architectures
- Kafka
- Docker
Auszug Referenzen (1)
"Es war eine Freude, mit J. zusammenzuarbeiten, sowohl fachlich, als auch menschlich. Ich kann ihn ohne Vorbehalt wärmstens empfehlen."
11/2014 – 12/2016
Tätigkeitsbeschreibung
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.
Amazon Web Services (AWS), AngularJS, Ruby on rails
Qualifikationen
Projekt‐ & Berufserfahrung
4/2023 – 12/2023
TätigkeitsbeschreibungBuilding and maintaining two RoR Applications exposing a REST API documented via Open API interacting with mobile clients. Implemented complex authentication and authorization flows.
Eingesetzte QualifikationenSQL, Docker, Ruby on rails
4/2021 – 4/2022
TätigkeitsbeschreibungGeo-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%.
Eingesetzte QualifikationenAmazon Web Services (AWS), Kafka, Ruby on rails
1/2021 – 7/2021
TätigkeitsbeschreibungConsulting the engineering team on system architecture and best practices around development workflows and processes. Mentoring team members and building features in RoR.
Eingesetzte QualifikationenGraphQL, Ruby on rails
10/2020 – 3/2021
TätigkeitsbeschreibungImplementing different services in ruby. One initiative was the anonymization of user data across internal and external systems to comply with GDPR regulations. I also implemented a system for automatic renewals of insurance contracts.
Eingesetzte QualifikationenRuby on rails
9/2018 – 6/2020
Tätigkeitsbeschreibung
Led the Growth Engineering team, responsible for building customer-facing web applications for lead generation and ad-tech products for the SEM, display, and SEO marketing teams. The team consisted of five Frontend Engineers, two Backend 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.
Carried out concept and implementation of a product for SEM campaign creation, utilising a geodatabase. This tool allowed marketing to launch millions of SEM ads in a structured and efficient way (10x faster).
Amazon Web Services (AWS), Docker, Ruby on rails
5/2017 – 9/2018
TätigkeitsbeschreibungImplemented an automated test suite with 98% test coverage of the code base, resulting in increased website reliability.
Eingesetzte QualifikationenReact (JavaScript library), Ruby on rails
10/2016 – 5/2017
TätigkeitsbeschreibungDeveloped technology and led product iterations from the first prototype to release, reaching the product-market fit.
Eingesetzte QualifikationenReact (JavaScript library), Ruby on rails
11/2014 – 12/2016
Tätigkeitsbeschreibung
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.
Amazon Web Services (AWS), AngularJS, Ruby on rails
Ausbildung
HTW Berlin
Über mich
At Deliveroo I was part of the availability team tackling scalability problems and ensuring higher reliability of the microservice architecture.
At Tourlane (sequoia backed travel tech startup), I led a cross-functional team of seven engineers.
Before Tourlane I worked as Lead Developer for the San Francisco based Startup Airgora.
After graduating from university in computer science I founded and was CEO of the TravelTech Startup 99trips for two years.
Browse projects I worked on: johannesengl.com
I am available for short- and long-term software engineering projects as well as startup consultancy.
My Stack:
- Ruby on Rails
- Golang
- AWS
- SQL
Specialties:
- AWS Cloud Computing
- Micro Service Architectures
- Solving scalability problems
- Agile Work Environments / Startups
- Validating early-stage products and iterating them towards product-market fit in the most efficient way
- Translating business requirements into digital products
- Ad-Tech for SEM and SEO
- Building and Managing Engineering Teams
- Stakeholder Management
- E-Commerce
- AB-Testing
- Scrum / Kanban
Persönliche Daten
- Deutsch (Muttersprache)
- Englisch (Fließend)
- Spanisch (Fließend)
- Europäische Union
- Schweiz
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