Sebastian is available for hire

Sebastian Bitzer

Verified Expert in Engineering

Software Developer

Location

Berlin, Germany

Toptal Member Since

December 31, 2019

Sebastian is a creative software engineer who is well-experienced with web services. Over the past eight years, he's worked on both front and back ends extensively. Sebastian loves picking up new tools and technologies and strives to optimize the reliability of his code a little more with each project by writing automated tests, modularizing meaningfully, and choosing great technologies.

Back-end Ruby Ruby on Rails (RoR)RSpec React PostgreSQL CSS Docker JavaScript Git GraphQL Python Rust Bootstrap Redis

Portfolio

Appear Here

Amazon Web Services (AWS), PostgreSQL, GraphQL, ECMAScript (ES6), React...

Homeday

Bootstrap, jQuery, Serverless Framework, MySQL, RSpec, Ruby on Rails (RoR)...

Testerpool

Codeship, Heroku, CSS, HTML, jQuery, JavaScript, Redis, PostgreSQL, RSpec...

Experience

RSpec - 8 years Ruby - 8 years Ruby on Rails (RoR) - 8 years PostgreSQL - 8 years React - 4 years GraphQL - 4 years Rust - 3 years TypeScript - 2 years

Availability

Part-time

Preferred Environment

React, Rust, Ruby on Rails (RoR), Ruby, TypeScript

The most amazing...

...project I have completed so far was the integration of a long-running data science algorithm into a nearly real-time responding web form.

Work Experience

Full-stack Engineer

2018 - 2019

Appear Here

Maintained and augmented the existing Ruby on Rails application.
Built user interfaces using React, ES6, and GraphQL.
Deployed data science models using Python, AWS Lambda, and the Serverless Framework.

Technologies: Amazon Web Services (AWS), PostgreSQL, GraphQL, ECMAScript (ES6), React, Serverless Framework, Python, RSpec, Ruby on Rails (RoR), Ruby, Flask, AWS Lambda, Jest, React Testing Library, Git, APIs, Back-end

Full-stack Engineer

2016 - 2017

Homeday

Maintained and augmented the existing Ruby on Rails application.
Implemented web scrapers with Ruby, Selenium, and others.
Built UIs using Twitter Bootstrap, Haml, and jQuery.

Technologies: Bootstrap, jQuery, Serverless Framework, MySQL, RSpec, Ruby on Rails (RoR), Ruby, Git, Back-end

Full-stack Engineer

2014 - 2016

Testerpool

Built a complex Ruby on Rails app from scratch including an extensive test suite.
Built UIs from scratch using Twitter Bootstrap, JavaScript, and jQuery.
Implemented a payment system using the PayPal API.
Set up a continuous deployment process using Bitbucket, Codeship, and Heroku.

Technologies: Codeship, Heroku, CSS, HTML, jQuery, JavaScript, Redis, PostgreSQL, RSpec, Ruby on Rails (RoR), Ruby, Git, Back-end

Experience

WahTalk — iOS and Android App for Connecting Nearby People

https://wahtalk.app

The app allows users to invite other nearby users for a talk. Having the app open tells people nearby that you are up for meeting new people.

I wrote a GraphQL API in Rust for this project while leveraging the PostGIS extension for PostgreSQL. For the iOS and Android apps, I used React Native and Expo.

trax — Personal Project Management App

https://trax.black

In addition to implementing the React (function components) single-page application and the GraphQL API in Rust, I also handled all of the designs and the concept of the personal project management app, trax. I ran it on a DigitalOcean server inside a Docker container and allowed HTTPS connections using Cloudflare.

Debae — Online Debating Platform

https://github.com/the-bass/debae

I conceptualized, designed, and implemented this Ruby on Rails monolith application that allows users to debate statements objectively using pro and contra arguments. I am running it on a DigitalOcean server inside a Docker container and enabling HTTPS connections using Cloudflare.

Skills

Languages

Ruby, HTML, CSS, Python, Rust, JavaScript, ECMAScript (ES6), GraphQL, TypeScript

Frameworks

Ruby on Rails (RoR), Bootstrap, Serverless Framework, React Native, Flask, Jest

Libraries/APIs

React, jQuery, React Testing Library

Tools

RSpec, Git, Codeship, Affinity Designer, Expo

Other

Back-end, APIs, Cloudflare

Platforms

Docker, Heroku, Amazon Web Services (AWS), AWS Lambda

Storage

Redis, PostgreSQL, MySQL, PostGIS

Paradigms

UX Design

Industry Expertise

Web Design

Certifications

FEBRUARY 2018 - PRESENT

Deep Learning Specialization

Coursera

Collaboration That Works

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