Developer
2018 - PRESENTTata Steel DV- Scoped, planned and implemented new features to an internal application.
- Delivered a massive integration change with Zoho Books.
- Integrated Hubspot CRM.
Technologies: PostgreSQL, Heroku, RubyDeveloper
2018 - 2018Blend Media- Supported the development of new features.
- Came up with a new concept for the publishing pipeline of 360° videos.
- Successfully integrated the product with Salesforce Pardot.
Technologies: PostgreSQL, ElixirFreelance Developer
2017 - 2017QT Mobilitätsservice GmbH (Qixxit)- Introduced a new CI pipeline to improve deployment processes and regression tests.
- Built an automated acceptance test suite to give product department a better overview of the state of development.
- Implemented a proof of concept for a routing engine based on pgRouting.
Technologies: pgRouting, Docker, Neo4j, PostgreSQL, ElixirFreelance Developer
2016 - 2017solarisBank AG- Implemented a database anonymization program for efficiently creating test data.
- Improved the existing continuous integration process.
- Created a notifications feature in the core applications that sent out messages via WebHooks.
- Worked on a prototype for a core banking system built in a CQRS way.
Technologies: Docker, PostgreSQL, Apache Kafka, Elixir, RubySenior Developer
2013 - 2016Propertybase GmbH- Designed and implemented a periodical import tool to fetch listing data in different formats (JRuby).
- Implemented and maintained the lead generation tool while working closely together with customer success and sales teams to further adapt the tool to new inbound channels.
- Handled and managed the technical onboarding of new clients (including data migration to Salesforce).
Technologies: Salesforce, Redis, MongoDB, PostgreSQL, JRuby, Ruby on Rails (RoR), RubySenior Developer
2011 - 2013stylefruits GmbH- Maintained and improved the main application (Ruby on Rails).
- Developed a URL-shorting service (Sinatra on JRuby).
- Designed and implemented a back-end to manage language translation tokens (Sinatra).
- Managed and handled the weekly testing process—writing automated scripts and overseeing the manual testing sessions.
Technologies: MySQL, Redis, Ruby on Rails (RoR), RubySenior Software Engineer
2008 - 2011Capgemini- Improved and maintained a Java-based web application for Deutsche Telekom AG (OMS-IP).
- Led workshop lessons regarding knowledge transfers for an offshore team in Kolkata, India.
- Maintained an invoicing system for a satellite TV provider in Munich.
- Improved an internal continuous integration workflow by dynamically dispatching test cases to concurrent processes.
Technologies: Oracle, JavaDeveloper
2005 - 2008Process Innovation Ag- Developed for the web with Java and JSP.
- Worked on IMB Lotus Notes and IBM DB2 development.
Technologies: Lotus Notes, JEE, Java
Software Developer in San Diego, CA, United States
Member since February 14, 2018
For the past eleven years, Leif has worked as a full-time developer focusing on back-end development utilizing Ruby or Elixir.
He's worked for giant consulting firms and newly founded startups. Through side projects and open source contributions, he makes sure he stays up to date on the latest tech. A healthy sense of pragmatism keeps him grounded to choose the technology that makes sense as opposed to going with whatever is hip right now.
Leif is now available for hire
Portfolio
- Tata Steel DVPostgreSQL, Heroku, Ruby
- Blend MediaPostgreSQL, Elixir
- QT Mobilitätsservice GmbH (Qixxit)pgRouting, Docker, Neo4j, PostgreSQL, Elixir
Experience
- PostgreSQL 9 years
- Ruby 9 years
- Ruby on Rails (RoR) 9 years
- REST 5 years
- Java 5 years
- Elixir 4 years
- JavaScript 3 years
- React 3 years
Availability
Part-time
Preferred Environment
Tmux, Git, Visual Studio Code (VS Code)
The most amazing...
...side project I've released is HN Vanity: an event-sourced application for getting basic hacker news statistics.
Employment
Experience
- HN Vanity
An event-sourced application that monitors Hacker News and extracts basic statistics for every story.
The statistics include:
• Title change
• First hit of the front page
• The time it took to hit the front page
• The highest front-page position
• The total time spent on the front page
Implemented with Elixir and PostgreSQL as an event store. - Release Ping
An overview of the common programming languages and their latest versions (stable and unstable).
- How Playing Around with Experimental Technologies Landed Me A 6-month Freelance Gighttp://blog.leif.io/how-playing-around-with-experimental-technologies-landed-me-a-6-month-freelance-gig/
An article about my experience building a side project; it has over 9,000 views.
- Morfohttps://github.com/leifg/morfo
A library that provides a DSL to transform data structures which is very valuable when working on data migrations.
- Excellenthttps://github.com/leifg/excellent
A Microsoft Excel parser that was written in Elixir.
- Bulkforcehttps://github.com/propertybase/bulkforce
A Ruby gem to access the Salesforce Bulk API.
- Formulonhttps://github.com/leifg/formulon
A Salesforce Formula parser that was implemented in pure JavaScript.
- Backportinghttps://github.com/leifg/backports
This backports newer functions to older versions of Elixir.
- PostgreSQL S3 Backup Docker Containerhttps://github.com/leifg/postgres-s3-backup-cron
A useful docker container that backups PostgreSQL databases to S3 and makes it possible to restore them.
- So So Soccerhttps://github.com/leifg/so_so_soccer
A comparison project between event sourcing and CRUD to solve the same problem: convert a soccer result table into an end-of-the-season standing table.
- Elixir Docker Imagehttps://github.com/leifg/docker-elixir
A minimal Elixir docker image.
- Time Trackinghttps://github.com/leifg/time_tracking
I wrote a script to synchronize Toggl time entries with FastBill.
- Don't Build, Integrate – A Guide to CRM Integration (Publication)Customer Relationship Management systems provide businesses with more clarity and information about customer behavior, helping boost sales, retain existing customers, and attract new ones. In this article, Toptal Software Developer Leif Gensert outlines the basic challenges of CRM integration and explains what you can do to make the process as efficient and frictionless as possible.
Skills
Languages
Ruby, Elixir, JavaScript, Elm, Java, JRubyFrameworks
Ruby on Rails (RoR), PhoenixParadigms
REST, CQRS, Event SourcingLibraries/APIs
pgRouting, Salesforce API, Salesforce Bulk API, Salesforce REST API, ReactTools
Git, Tmux, Lotus NotesPlatforms
Salesforce, Visual Studio Code (VS Code), Oracle, Apache Kafka, Docker, Heroku, JEEStorage
Redis, PostgreSQL, MySQL, MongoDB, Neo4jOther
Events
Education
- Bachelor's Degree in Computer Science and Business Administration2005 - 2008DHBW Karlsruhe - Karlsruhe, Germany
- Bachelor's Degree in Computer Science2005 - 2008The Open University - London, England
