Haiko Schol Email & Phone Number

working on Gossamer, a Polkadot host implementation in Go

- Contributed initial support for Bazel to OSS Review Toolkit- Set up and maintained Kubernetes-based infrastructure on Scaleway for hosting ORT Server

Berlin, Germany

Went down the blockchain rabbit hole at one of the best companies in the space. Parity works on Polkadot, a "layer zero" blockchain that provides shared security and cross messaging for application specific "parachains".During my time at Parity I mainly worked on two projects, which I designed and implemented from scratch.The first was automation for "burn-in testing" of in development versions of Polkadot. The system was written in Go with a simple React frontend, used a GitOps approach and GitLab CI to manage deployments and integrated with Matrix-based chat for notifications (https://github.com/haikoschol/burn-in-tests).The second project was a custom indexer for Kusama and Polkadot plus a web application to access the indexed data. The indexer and backend API were written in Rust and the web frontend in React/TypeScript. Everything was deployed to Kubernetes and the indexer jobs were managed as CronJobs.

Berlin, Germany

The Pricing & Forecasting department delivers sales forecasts and pricing recommendations that are crucial to the business.My responsibilities included development of Kubernetes operators for orchestrating machine learning pipelines in Python, based on an open source framework (https://github.com/zalando-incubator/kopf).The team I worked with was going through a transition period, with many new joiners within a few weeks. I accelerated onboarding of the new members by giving talks about architecture and code deep dives and provided in-depth code reviews and pair programming sessions.

Düsseldorf Area, Germany

Joining the IaaS Management team, I worked on a product that allows teams to describe and maintain cloud infrastructure as declarative code. It is similar to Terraform, but more tailored to common use cases and focused on enabling a collaborative, git-based workflow.

Berlin Area, Germany

As part of the Open Source Team at HERE, I worked on automating the legal compliance workflows (licenses, copyrights, patents, etc.) for releasing proprietary software to customers, as well as open source projects.My responsibilities included contributing to tooling used by the team, such as ScanCode (github.com/nexB/scancode-toolkit) and OSS Review Toolkit (github.com/heremaps/oss-review-toolkit) as well as helping teams inside the company understand and complete the process.

Berlin Area, Germany

Superscale builds a managed WiFi platform, leveraging consumer hardware running OpenWRT (with our additions written in Rust)My focus was on the Cloud side of the product, which consists of an external HTTP/JSON API, a few internal services and a messaging layer built on MQTT.

Berlin Area, Germany

Returning to the project from 2014, I built a new data import for large datasets (500GB+) using SFTP. On the input side, it supports various compression and encryption schemes, some of which are transformed to the format expected by the platform in a streaming manner to avoid excessive memory usage and failures from running out of disk space for temporary files.This feature was instrumental in securing a partnership with an enterprise customer.

Nairobi

Pair programming with a friend, we refactored parts of the backend, mainly to improve robustness in the face of unreliable mobile network connectivity and enable the use of websockets to improve the user experience.

Berlin

In this greenfield project we built a platform with a public HTTP/JSON API for processing andvisualizing large geo datasets. I designed the API, with input from the frontend team who would be the first to use it, and contributed to its implementation.

Berlin

Development of an HTTP/JSON API for management and distribution of software updates on the OS and application layer via rsync Development of Unix daemons in Python (gevent, Tornado, daemontools) and Windows services (pywin32, py2exe)Development of automated tests (nose, mock, Selenium)Deployment of Django and Tornado applications withFabric, Vagrant, Apache, mod_uwsgi, uwsgi, PostgreSQL, Upstart, some on AWS EC2 (boto)Development of Firefox AddOns

Computer Software Engineering

Computer Science

Cognitive Science, Computer Science