Peter Teich - Freelance Go-Developer/DevOps-Engineer

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Leipzig, Germany

Experience

Jan 2024 - Jan 2024

1 month

Berlin, Germany

Freelance Go-Developer/DevOps-Engineer

IONOS SE

Implementation of an API for customers to provide NFS shares in the cloud
Creating Kubernetes operators and services with REST-APIs in Go
LinuxKit for provisioning VMs

Nov 2023 - Mar 2024

5 months

Germany

Freelance Go-Developer

Institut für Bildungsanalysen BaWü

Adapting open-source software (Gitea, Forgejo) for school use
Gitea is a self-hosted Git system written in Go, offering features similar to GitHub. It is meant to be used in computer science classes in schools in BaWü, and I adjust features for this purpose (e.g., user management)
Ansible deployments, Docker Swarm
The deployment runs on dedicated servers in Docker containers using Docker Swarm. I help with creating the Docker images as well as the deployment with Ansible

Jul 2023 - Dec 2023

6 months

Karlsruhe, Germany

Freelance Go-Developer

Energy sector

Web services, REST-APIs and microservices in Go
In this project, I adapted and created Go microservices that provide REST-APIs and gRPC APIs both for other internal services and mainly for the web frontend built in ReactJS
MongoDB, Kubernetes deployments, Azure DevOps, AKS deployments, Terraform
The microservices are compiled in Azure DevOps pipelines and Docker images are created. My task was to adapt existing pipelines for new services. I also created and maintained a new pipeline that allows restoring backups of individual collections of a managed MongoDB (Atlas) via CI
To create secrets and resources in Azure, I adapted and extended existing Terraform scripts

Mar 2023 - Sep 2023

7 months

Hanover, Germany

Freelance Go-Developer

LynqTech GmbH

Web services, REST-APIs and microservices in Go
Here I further developed microservices that provide APIs for the frontend (ReactJS) and map internal scheduled processes (fetching and verifying invoices, creating tax statements) in the energy industry
PostgreSQL, Kubernetes deployments
The services use PostgreSQL as the database and manual SQL queries without an ORM. For deployment, I had to adapt and maintain existing Helm charts

Mar 2023 - May 2023

3 months

Nuremberg, Germany

Freelance DevOps-Consultant

Computacenter AG & Co OHG

DevOps support for Kubernetes, OpenSearch and Fluentbit
The client manages large amounts of logs generated by their own internal systems as well as delivered by external systems. OpenSearch in Kubernetes was chosen for storage. My task was to create proof-of-concept implementations for using Fluentbit to collect logs from Docker containers and syslog sources, parse them and route them to different endpoints based on various criteria. The client had no in-house know-how for using Fluentbit, so knowledge transfer and training were important here
Log analysis and dashboards with OpenSearch
Creating PoCs, training and support for internal employees
Kubernetes deployments, Helm charts, ArgoCD, Terraform
Since deployment was done via Terraform and Helm charts, I helped adapt existing Terraform scripts that, among other things, deployed Fluentbit via Helm charts

Dec 2022 - Feb 2023

3 months

Dortmund, Germany

Freelance Go-Consultant

KPS AG

Go support and coaching, code reviews
The client wanted Go support for an internal team that was building services in Go for the first time. We created service blueprints together and ran custom training sessions. I reviewed the code the team wrote and gave suggestions for changes
GCP serverless functions, GitLab CI
The Go code uses serverless functions in GCP. Deployment is done via pipelines in GitLab. I adapted build scripts for compiling the Go services

Feb 2022 - Nov 2022

10 months

Hamburg, Germany

Freelance DevOps/Go-Consultant

EOS Technology Solution GmbH

Backend development of web services and microservices in Go for platform/DevOps services
For the client, I built a new service that offers a REST API for internal developers to install, configure, and remove their own Graylog instances in Kubernetes. The service uses the Kubernetes API and a PostgreSQL database
Log analysis with Graylog
Adjusting existing Ansible scripts for Graylog deployment
Kubernetes, GitLab CI, ArgoCD
The services are deployed in Kubernetes using a GitOps approach. I created Helm charts that ArgoCD deploys

Oct 2021 - Jan 2022

4 months

Munich, Germany

Freelance Go-Consultant

NFON AG

Go code reviews for microservices
Go coaching
Planning new Go services

May 2021 - Dec 2022

1 year 8 months

Walldorf, Germany

Freelance DevOps/Go-Consultant

SAP SE

Backend development of web services and microservices in Go with GraphQL
The client runs an internal web app in ReactJS. My task was to maintain and build the backend services it needs. The interface between frontend and backend was GraphQL
Backend code reviews in Go
Kubernetes operators in Go
Besides services that serve GraphQL to the frontend, many backend services were set up as Kubernetes operators, since no database was used and the data was stored in Kubernetes custom resources

Jan 2021 - Sep 2021

9 months

Hanover, Germany

Freelance Go-Developer

LynqTech GmbH

Web services, REST APIs, and microservices in Go (energy sector)
Kubernetes deployments

May 2020 - Sep 2020

5 months

Paris, France

Freelance Go-Coach/Trainer

Wild Code School

Go training as part of the Software Engineering Academy for Deutsche Telekom AG
Live coding for Go and Docker/Kubernetes, code reviews

Apr 2020 - Dec 2020

9 months

Walldorf, Germany

Freelance DevOps/Go-Consultant

SAP SE

Cloud-native backend development with Go
API integration with AWS, GCP and Azure SDKs to fetch capabilities of cloud services
The backend service uses the SDKs of the major hyperscalers to discover and maintain data such as available VMs, pricing, storage classes, etc. Data is provided via REST APIs to a ReactJS frontend for display. My task was to implement functions to retrieve and store data from the hyperscalers
Dynatrace API, CLI tools for Dynatrace Cluster Operations

Oct 2019 - Apr 2020

7 months

Düsseldorf, Germany

Freelance Go-Consultant

Accendere GmbH

Backend development with Go, coaching internal developers in Go best practices
Migration of PHP code to Go
Go microservices architecture with RabbitMQ, GraphQL and MySQL

Sep 2019 - Aug 2020

1 year

Fürth, Germany

Freelance DevOps-Engineer

MOIO GmbH

DevOps consultant, microservices architecture
GitLab CI/CD, Kubernetes deployments with ArgoCD

May 2019 - Mar 2020

11 months

Erfurt, Germany

Freelance Go-Consultant

Plazz AG

Backend development with Go, coaching internal teams in Go programming
Migration of PHP code to Go
Go microservices architecture with event bus integration (NATS) and MongoDB
Kubernetes deployments

Jan 2019 - Dec 2019

1 year

Berlin, Germany

Freelance Go-Developer

TUI.com

Backend development with Go, coaching internal teams in Go programming
Migration from a Java monolith to Go microservices, integration with Redis and MongoDB
Code reviews

Aug 2018 - Feb 2020

1 year 7 months

Germany

Freelance Fullstack-Developer

Crosscan GmbH

Backend development with NodeJS/Express, MariaDB, MSSQL Server
Backend development with Go
Frontend development with ReactJS and Material Design
Integration and control of e-paper displays via REST API (Smart ESL, Pricer)
Deployment with Docker, Docker Compose

May 2018 - Mar 2020

1 year 11 months

Germany

Freelance Go-Developer

Dr. Ing. h.c. F. Porsche AG

Code reviews / quality assurance for Go code
Backend development with Go
Consulting on software architecture and Docker usage
Go tools for delivering certificates via the ACME protocol and integration with an internal CA
Deployment with GitLab CI/CD and Docker

Mar 2018 - Nov 2018

9 months

Hamburg, Germany

Freelance Go-Developer

OTTO GmbH & Co KG (OTTO IT)

Backend development with Go and bug fixes for existing Java services (Spring)
Support for the frontend team (ReactJS, Redux, Semantic UI)
Microservice architecture, Kafka event bus, MongoDB integration, Nomad, Docker, Consul, GoCD
Agile development using Scrum, Atlassian stack (Jira, Bitbucket, Confluence)

Dec 2017 - Mar 2018

4 months

Leipzig, Germany

Freelance Go-Developer

Mogic GmbH

Development of a Go backend for communication with IoT devices
Implementation of a binary protocol on the IoT side to a REST API on the web side

Jan 2017 - Dec 2017

1 year

Hamburg, Germany

Freelance DevOps Engineer

About You GmbH

DevOps engineer in the operations team
Deployment and administration of cloud instances on Debian using Ansible and Packer
Configuration of Nginx for PHP environments
Support for the transition of services to AWS
Planning and optimization of server infrastructure together with the dev teams
Agile development with Scrum and Kanban, Atlassian stack (Jira, Bitbucket, Confluence), Jenkins CI

Feb 2016 - Feb 2017

1 year 1 month

Hamburg, Germany

Freelance Developer

Radio Hamburg

Development of a system to automatically create web radio streams from playlists using LiquidSoap, Icecast, NodeJS and Go in a distributed microservice architecture
Deployment and high-availability strategy using Docker and Ansible
Server infrastructure for real-time metadata processing (artist, song) using RabbitMQ and a NodeJS backend to serve metadata to external web players

Oct 2015 - Dec 2017

2 years 3 months

Darmstadt, Germany

Freelance Developer/DevOps Engineer

a-tune Software AG

Development of a Go middleware for log data processing and aggregation for Elasticsearch/Kibana (XML, CSV, server logs)
Visualizations and dashboards based on client requirements
Coaching of technical users in the company on using Kibana

Jan 2012 - Jan 2024

12 years 1 month

Leipzig, Germany

CTO + Co-Founder

QuantumCast GmbH/streamABC GmbH

Planning and development of an audio streaming solution based on distributed microservices in Go using FFMPEG, Liquidsoap and Icecast
High-concurrency Go services
Backend development in Go, NodeJS, PHP and frontend development (radio player) with HTML5/JavaScript/SASS, SDK development
Distributed Docker-based infrastructure and service structuring (Nomad, Consul, RabbitMQ)
Deployment and operation of services with Ansible and Docker, orchestration with Kubernetes
Aggregation and analysis of log data with OpenSearch, Fluentbit, InfluxDB, Grafana and Kibana
Technical project management

Jan 2008 - Dec 2017

10 years

Leipzig, Germany

Freelance Developer

Druck und Werte GmbH

Planning and software architecture of an RIA in the B2B sector (print/media)
Development in PHP (Zend Framework) and support of the Java team in APIs/REST interfaces and frontend (CSS, JS)
Administration and operation of services (Linux VMs), Nginx web server, GitLab
Software reviews, audits and quality assurance

Jan 2005 - Dec 2015

11 years

Leipzig, Germany

Freelancer Developer

Green-M Interface Design GmbH

Web development (frontend/backend) for various agency clients using PHP (Zend Framework), JavaScript, HTML, CSS, MySQL with custom CMS solutions
Planning and optimizing the architecture of web applications and REST APIs for apps
Planning and setting up search systems based on ElasticSearch for portal sites. Indexing and search with JavaScript and PHP clients
Administration of Linux server systems (Debian, Ubuntu)
Source code audits including code quality checks

Jan 2004 - Dec 2014

11 years

Leipzig, Germany

Freelancer Developer

torpedo Leipzig GmbH

Web development (frontend/backend) for various agency clients using PHP (Zend Framework), JavaScript, HTML, CSS, MySQL with custom CMS solutions as well as RIAs in the B2C and B2B areas
System administration of internal servers (Mac OS X, Linux) and external servers (physical and virtual, Debian + Ubuntu Linux)
Log analysis and aggregation
Technical project management, workflow modeling

Jan 2004 - Dec 2008

5 years

Berlin, Germany

Freelancer Developer

Motor Entertainment GmbH

Development and maintenance of a comprehensive editorial system for a music magazine and label based on PHP (Zend Framework), MySQL, JavaScript, and HTML
Planning and development of a newsletter system
Data analysis of log data and statistics
System administration of the used Linux servers (Ubuntu, Debian)

Jan 2000 - Dec 2005

6 years

Bodenheim, Germany

Freelancer Technical Writer

Herdt-Verlag

Author of training materials, e.g. VBA programming with Office, Perl 5, SQL databases
Technical editor for training materials

Jan 1996 - Dec 1996

1 year

Lille, France

Semester Abroad

ENIC TELECOM LILLE 1

Project work: web/database development, Perl, CGI, Oracle

Jan 1993 - Dec 1998

6 years

Leipzig, Germany

Studies in Communications Engineering

Deutsche Telekom University of Applied Sciences, Leipzig

Specialization in technical documentation
Diploma Engineer (FH) in communications engineering, technical editor
Thesis: “Creating a user manual for the time tracking, access control, and user software Leancom 4.0 for Windows” (Grade: 1)

Jan 1993 - Dec 1993

1 year

Borna, Germany

German Abitur

Am Breiten Teich High School

German Abitur

Summary

Developing innovative solutions using current technologies with over 20 years of experience in software development, data analysis, operations and administration, as well as training and coaching.

Holistic view on projects, from architecture to frontend/backend development, all the way to deployment and operations.

Analysis and aggregation of log data and metrics with ElasticSearch/OpenSearch, Prometheus and InfluxDB.

Focus on backend development with Go (Golang), microservice architectures, and up-to-date DevOps technologies (Docker, Ansible, Kubernetes, ArgoCD, Hashicorp Nomad & Consul).

Event-based real-time solutions with RabbitMQ, Kafka, NATS and Websockets.