Software Engineering
Software Engineering
Profile
Tobias is a senior software developer and systems architect with an extensive experience with building and maintaining large-scale systems with high demands on availability and reliability.
A problem solver at heart, Tobias is happiest when faced with complex problems. He is a firm believer in that most situations can be solved by truly understanding the problem at hand and finding the appropriate way of modelling the problem.
While Erlang is his go to language for development, his skills at analyzing problems and finding solutions can be applied to most backend development.
During his years at the High Performance Erlang (HiPE) research group at Uppsala University he was the original developer of Dialyzer, a static analysis tool for Erlang that now is an industry standard tool for finding bugs in Erlang programs. Dialyzer is distributed in the Erlang/OTP distribution.
Experience
2014 - now
Senior Software Developer, Happi Hacking
See below for project descriptions.
Keywords: Scalability, Availability, Reliability, Fault tolerance.
Technologies: Erlang, Flutter, Dart, Javascript, Docker, Linux, Bash, AWS, GIT, Ansible.
2008 - 2014
Senior Software Developer, Klarna Bank AB
Tobias worked on all aspects of the main transaction system. He was a developer, architect and a member of Klarna's Technical Advisory Board. In the later years, he was mostly focused on growing the capacity of the system in the face of exponential growth of the transaction volume.
Keywords: Scalability, Availability, Reliability, Fault tolerance, FinTech.
Technologies: Erlang, Linux, Bash, GIT
Projects in HappiHacking (by selection)
2022
Developer for AI Startup in stealth mode
Analyzing ML models in MLIR and llvm.
Keywords: ML, AI, Compiler Technology
Technologies: C++
2022
IOT & Digital Twins for Deutsche Telekom
Tobias joined the testing team for a Happi Hacking project done for Deutche Telekom. The system is a large IoT central hub with large external and internal APIs. Tobias used stateful property based testing to validate the microservices' interoperability.
Keywords: Property Based Testing, APIs, Microservices
Technologies: Erlang, Linux, Bash, GIT, Quickcheck, AWS.
2021
MQTT broker development for EMQ
Tobias was a part of the core development team for the MQTT message broker EMQX. He implemented the functionality for persistent MQTT sessions.
Keywords: MQTT, IoT, Message Brokers
Technologies: Erlang, Linux, Bash, GIT, MQTT, EMQX.
2021 - now
Building the mobile game Taba
Tobias, together with other HappiHacking staff, developed the casual puzzle game Taba, scheduled to be released during spring 2023. Tobias wrote the backend in Erlang, and also several versions of the front end, using Javascript, Dart and Flutter.
Keywords: Casual Games, API design, UI programming.
Technologies: Erlang, Javascript, Dart, Linux, Bash, GIT, AWS, Flutter, Postgres
2019 - 2020
Data pipeline for IoT communication for Deutsche Telekom
Tobias built a data pipeline from scratch for handling a large volume of IoT communication. The implementation was in Erlang, and was a proof of concept for later projects made for Deutche Telekom.
Keywords: IoT, Data Pipelines, APIs, Microservices
Technologies: Erlang, Linux, Bash, GIT, Quickcheck, AWS.
2017 - 2019
Building a blockchain for æternity
Tobias joined an international team that from scratch developed the public block chain æternity. He implemented some core features such as the Patricia Merkle Tree and the block verification and construction. While Tobias these days thinks that proof of work is bad in general, a lot of the cryptographic techniques are very interesting for other areas in the form of distributed ledgers.
Keywords: Blockchain, Merkle Trees, Distributed Ledgers, Virtual Machines, Compilers.
Technologies: Erlang, Linux, Bash, GIT.
2015 - 2020
Building a real estate platform for Doorling
Tobias was originally the only backend developer in a project that evolved into a company called Doorling. The platform was a social media platform that intended to democratize the real estate market. This was a joint effort with the Norwegian real estate company Krogsveen.
Keywords: Backend API design, DynamoDB, AWS, Real Estate Market.
Technologies: Erlang, Linux, Bash, GIT, Ansible, AWS.
2014 - 2017
Building the online board game platform
The company built straboga.com, an online board game platform that is now discontinued.
Keywords: API design, Distributed databases, UI programming, Platform design.
Technologies: Erlang, Javascript, Linux, Bash, GIT, Ansible, AWS.
Education
2002 - 2008
PhD Student, Uppsala University/Ericsson
Stumbling at the end, Tobias never defended his PhD thesis, but the time at the HiPE research group yielded Dialyzer, a static analysis tool for finding bugs in Erlang programs. And a bunch of academic publications.
Keywords: Static Analysis, Compilers, Virtual Machines, Research, Academic Writing.
Technologies: Erlang, Bash, Linux
1996 - 2001
MSc Engineering Physics, Uppsala University
Keywords: Physics, Computer Science, Engineering.
Master’s programme during which Tobias specialized in algorithms, compiler techniques and static analysis of Erlang programs.