Software engineer based in Guatemala with a strong commitment to software craftsmanship and continuous improvement. Advocate for clean code, well-organized architecture, and functional programming paradigms across the Full-Stack. Passionate about science fiction, specialty coffee, board games, and yoga.
Software Engineer, oschrenk
May, 2016 - Present
Providing consulting services as a Full-Stack developer with expertise in DevOps and functional programming. Specializing in building websites and services from the ground up, with a focus on continuous integration and agile methodologies.
Senior Software Engineer, Timewax
Jun, 2024 - Present
Led the transition from a single shared staging environment to feature-based multi-environments, significantly accelerating code review and release cycles
Improved initial page load time by ~30% through implementing effective asset caching strategies
Software Engineer, Backend, Vandebron
Sep, 2022 - Dec, 20231 year 3 months
Analyzed and documented systems and products for electricity/gas consumption dashboards
Migrated from batch systems (Spark) to queue-based (Azure, Kafka) systems for consumption readings
Software Engineer, Zalando
Feb, 2022 - Jul, 20225 months
Upgraded collection of microservices from Scala 2.12 to Scala 2.13
Software Engineer, Badger Systems GmbH
Jun, 2020 - Aug, 20222 years 2 months
Senior Software Engineer, Elsevier
Nov, 2017 - Nov, 20192 years
Improved Mendeley's News Feed through A/B experiments
Created Portfolio Management tool (unreleased)
Tutor, Git to Great
Mar, 2017 - Oct, 20192 years 7 months
Git to Great is a hands-on series of monthly, full-day workshops on git workflow.
Software Consultant Backend Services, vandebron
Jun, 2016 - Sep, 20171 year 3 months
Built REST API (Scala, Spray), providing data backend to public website and internal services, connecting with the grid provider
Initiated SmartGrid service using Tesla integration (Scala, Akka)
Created BigData pipeline for electricity consumption (Scala, Spark, Mesos)
Added monitoring systems to API to control scaling issues (InfluxDB, Ansible)
Software Engineer, Elmar Reizen
May, 2013 - Feb, 20162 years 8 months
Developed a Hypermedia API for travel deals in Scala using Play Framework
Migrated Hadoop batch processing to Spark cluster
Implemented big data processing with Spark, feeding results in a distributed manner into SolrCloud cluster
Developed frontend with ClojureScript
Software Developer, Q2Web
Apr, 2010 - Apr, 20133 years
Developed a software stack for inventory and service management for a telecommunications service provider
Researched future technologies and their applications (Node.js, OpenCL)
Ported geoinformation algorithms to the GPU
Software Developer, DBC Digital Business Creators GmbH
Oct, 2007 - Apr, 20102 years 6 months
Developed content models for websites for medium-sized businesses
Set up newsletter systems based on PHPList and ezPublish Newsletter
Developed Lucene-based custom intranet searches
Maintained and enhanced a Flex-based construction loan application for public savings banks served by a JavaEE platform
Software Developer, net mobile AG
Apr, 2004 - Oct, 20073 years 6 months
Ported DoCoMo's DoJa-based games to different handsets
Integrated accounting, license, and high score systems
Created DoJa-based seasonal Puzzle Bobble games for Easter and Christmas
Managed and developed a sales platform for mobile games based on custom PHP solution
Scala
Kotlin
Kubernetes
Go
TypeScript
Continuous Integration
DevOps
Automation
macOS
IntelliJ
nvim
Agile Methodologies
Diverse Team
Thoughtful Office Layout
Computer Science, Bachelor of Science (B.Sc.), Heinrich-Heine University, Düsseldorf
Dec, 2002 - Dec, 2007
Computer Science, Master of Science (M.Sc.), Heinrich-Heine University, Düsseldorf
Dec, 2007 - Dec, 2012
Master Thesis: Trajectory Compression by Means of GPU - Implemented three different lossy compression algorithms for GPS traces on the GPU using OpenCL
Project Thesis: Exchanging Spatial Information in the Context of Vehicle to Vehicle Communication - Researched geographic information systems with focus on the exchange of spatial information
Functional Programming Principles in Scala, Coursera Course Certificates
Issued on:
Functional Program Design in Scala, Coursera Course Certificates
Issued on:
Parallel programming, Coursera
Issued on:
Big Data Analysis with Scala and Spark, Coursera
Issued on:
Professional Scrum Master I, scrum.org
Issued on: Sep 28, 2018
Co-Founder, Technical Support, Karmariders
Oct, 2007 - Nov, 2012
Organized and executed fundraising campaigns, including bicycle tours through Germany and Northeast India
Coordinated annual bicycle tour events through the Ruhrgebiet
Created and maintained the organization's websites
Desk, Technical Support, International English Library
Aug, 2006 - Mar, 2008
Provided front desk support, assisting customers with finding and borrowing books
Organized books using the Dewey Decimal System
Initiated the introduction of library management software to improve operations
Conference Helper, Fronteers Conference
Oct, 2016 - Oct, 2016
Supervised successful execution of two-day web development workshops
Provided general support at the conference
Coffee
Science Fiction
Board Games
Yoga
I had the pleasure of working with Oliver for about a year, especially on a challenging greenfield project where we had to start from scratch with very little domain knowledge and uncertain requirements. Oliver quickly became the key player, taking charge of the project and designing a rock-solid system from the ground up. His ability to navigate through unclear requirements and figure things out independently was truly impressive.
What stood out even more was Oliver’s knack for knowledge sharing and his proactiveness in doing so. He was always ready to explain complex ideas in simple terms, making it easy for the whole team to keep up, both technical and non-technical members. His willingness to teach and his approachable nature helped all of us improve our skills significantly.
On top of being a highly skilled developer, Oliver is a great person to work with—funny, truly passionate about our craft, and with excellent communication skills. He made a huge impact on our project and on our professional growth.
I really hope to get the chance to work with him again in the future and can easily recommend him for any company looking for a senior backend developer.
Oliver is an excellent developer with a highly professional approach to work. I worked closely with him on several projects at Vandebron, and learned a lot about Scala while working with him. He is highly capable, both of viewing problems and solutions at a systems level and diving into the highest levels of detail within those systems. I highly recommend Oliver.