Qaiser A. - Freelance DevOps Engineer

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Berlin, Germany

Experience

Jan 2024 - Present

1 year 10 months

Hybrid

Freelance DevOps Engineer

HUK-Coburg

Migration and optimization of core services in a hybrid cloud environment to improve scalability and maintainability
Took over technical responsibility for Go-based development after the departure of the only Go expert and strengthened the team's AWS and Terraform skills
Designed and implemented data services to build a service catalog with Backstage.io
Developed a Kafka HTTP proxy in Golang as a secure replacement for the Confluent version
Built a high-performance Lambda function as a custom AWS API Gateway authorizer and packaged it as a central Terraform module
Extended a TypeScript-based pipeline for integration with IBM API Connect
Created a technical blueprint for transferring large BLOBs from the AWS VPC to the secure on-premise network
Provided team coaching on AWS, Terraform, Golang, and Quarkus

Nov 2022 - Nov 2023

1 year 1 month

Freelance DevOps Engineer

AboutYou (SCAYLE Storefront)

Developed a service facade to encapsulate core business logic (cart, wishlist, search, etc.) with a focus on scalability and performance
Initiated and led the replacement of a hard-to-maintain PHP legacy interface with a high-performance Go implementation
Achieved significant improvements in API performance and scalability compared to the PHP legacy interface
Worked with tech leads on architectural decisions and evaluated new technologies
Contributed to the development of the open-source TypeScript SDK for the Storefront API
Coached and provided technical support to junior developers in Golang

Apr 2022 - Dec 2022

9 months

Freelance DevOps Engineer

RTL

Implemented central data and search services for the new RTL+ app
Advised on buy-vs-build decisions for Elasticsearch (self-managed vs. cloud service)
Developed a microservice architecture using Python in Google Kubernetes Engine (GKE)
Evaluated performance of the new interfaces
Supported stakeholder management by coordinating and communicating between business units

Nov 2021 - Apr 2022

6 months

Freelance DevOps Engineer

Delivery Hero

Supported the backend team with integrating the partners API and optimizing internal backoffice applications
Implemented additional use cases for order processing, central product database, and catalog management
Improved continuous integration and deployment workflows
Redesigned and expanded the test suite with a focus on reliability and efficiency

Apr 2021 - Nov 2022

1 year 8 months

Freelance DevOps Engineer

IKEA

Built and enhanced a Google Cloud application in the warehouse & logistics area to connect the WMS to robotic storage components
Developed microservices on Google Cloud Platform using Cloud Functions and Cloud Run
Automated infrastructure with Terraform
Assisted the product owner with requirements analysis

Dec 2020 - Jul 2021

8 months

Freelance DevOps Engineer

Taxdoo

Design and implementation of a high-performance import service for transaction data from third-party payment providers
Development of a low-latency import service with AWS Lambda
Design of a data warehouse setup including visualization with AWS QuickSight
Development of interfaces for automated VAT ID verification.

Sep 2020 - Jun 2021

10 months

Germany

Lecturer in Software Engineering

FOM Hochschule

Teaching in software engineering

Apr 2020 - Present

5 years 7 months

Freelance DevOps/Cloud Engineer

Freelance IT Consulting

Specialization in DevOps and cloud infrastructure

Apr 2020 - Dec 2020

9 months

Freelance DevOps Engineer

SAP Cloud Platform Application Performance Monitoring

Feasibility study for cloud cost optimization in Dynatrace Synthetic Monitoring and evaluation of a self-hosting strategy
Terraform deployment for ActiveGate in various target clouds
Benchmark analyses with hardware sizing recommendations
Further development of the SAP-internal Dynatrace CLI tool in Golang

Apr 2018 - Apr 2020

2 years 1 month

Berlin, Germany

Senior DevOps Engineer, Search

SoundCloud

Further development of search systems and operation of large-scale Elasticsearch clusters (~100 nodes)
Reduced reindex time from 6 to 1 hour and improved p95 search latency by 4x
Created A/B test proposals and RFCs (e.g., exact match searches)
On-call duty and incident management for up to 2,000 queries per second

Apr 2017 - Apr 2018

1 year 1 month

Frankfurt, Germany

Senior DevOps Engineer, Product Development

Dibuco

Development of a big data platform

Apr 2016 - Apr 2017

1 year 1 month

Frankfurt, Germany

Senior IT Consultant

Codecentric

Java and DevOps consulting for Douglas, Aareal Bank and FAZ

Sep 2014 - Apr 2016

1 year 8 months

Frankfurt, Germany

IT Consultant

Novatec Consulting

Consulting in the Java environment for Commerzbank, Daimler, Bosch and Swissgrid

Oct 2011 - Aug 2014

2 years 11 months

Frankfurt, Germany

Bachelor of Science in Computer Science

Frankfurt University of Applied Sciences

Bachelor's thesis: Evaluation of BeanTest

Summary

I have deep experience in designing and implementing cloud-based infrastructures and optimized DevOps solutions. I have migrated and optimized core services in hybrid cloud environments, led Go-based development teams, and implemented scalable data and API services using AWS, Terraform, and Golang. I have a solid track record in container orchestration, serverless application design, and building efficient pipelines for service integration.

I excel in technical coaching and simplifying complex architectures for better performance and scalability. My work in diverse industries, from media to retail and logistics, has sharpened my ability to deliver high-quality solutions that streamline operations and improve system reliability.