Qaiser A. - Freelance DevOps Engineer

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Berlin, Germany

Experience

Jan 2024 - Present

1 year 9 months

Hybrid

Freelance DevOps Engineer

HUK-Coburg

Migration and optimization of core services in a hybrid cloud environment to increase scalability and maintainability
Took on technical responsibility for Go-based developments after the departure of the only Go expert and strengthened the team's AWS and Terraform skills
Designed and implemented data services for creating a service catalog with Backstage.io
Developed a Kafka HTTP proxy in Golang as a secure replacement for the Confluent version
Developed a high-performance Lambda function as a custom AWS API Gateway authorizer and packaged it as a central Terraform module
Further developed a TypeScript-based pipeline to integrate with IBM API Connect
Created a technical blueprint for transferring large BLOBs from the AWS VPC to the secured on-premise network
Conducted 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 the core business logic (shopping cart, wishlist, search, etc.) with a focus on scalability and performance
Initiated and led the replacement of a barely maintainable PHP legacy interface with a high-performance Go implementation
Achieved significant improvements in API performance and scalability compared to the legacy PHP interface
Defined architecture decisions together with tech leads 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-hosted vs. cloud service)
Developed a microservice architecture with Python on Google Kubernetes Engine (GKE)
Evaluated the performance of the new interfaces
Supported stakeholder management through coordination and communication 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 back office applications
Implemented additional use cases for order processing, central product database, and catalog management
Improved continuous integration and deployment workflows
Overhauled and expanded the test suite with a focus on reliability and efficiency

Apr 2021 - Nov 2022

1 year 8 months

Freelance DevOps Engineer

IKEA

Developed and enhanced a Google Cloud application in the Warehouse & Logistics domain to connect the WMS to robotic storage components
Built 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

Designed and implemented a high-performance import service for transaction data from third-party payment providers
Developed a low-latency import service using AWS Lambda
Designed a data warehouse setup, including visualization with AWS QuickSight
Developed interfaces for automated validation of VAT ID numbers

Sep 2020 - Jun 2021

10 months

Germany

Lecturer in Software Engineering

FOM Hochschule

Teaching Software Engineering

Apr 2020 - Present

5 years 6 months

Freelance DevOps/Cloud Engineer

Freelance IT Consulting

Specialized in DevOps and cloud infrastructure

Apr 2020 - Dec 2020

9 months

Freelance DevOps Engineer

SAP Cloud Platform Application Performance Monitoring

Conducted a feasibility study for cloud cost optimization in Dynatrace Synthetic Monitoring and evaluated a self-hosting strategy
Implemented Terraform deployments for ActiveGate across multiple target clouds
Performed benchmark analyses with hardware sizing recommendations
Enhanced the SAP-internal Dynatrace CLI tool in Go

Apr 2018 - Apr 2020

2 years 1 month

Berlin, Germany

Senior DevOps Engineer, Search

SoundCloud

Enhanced search systems and operated 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)
Handled 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

Java consulting 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.