Abdur Rafay - Software Engineer, Machine Learning Infrastructure

Q: Where is Abdur based?

Abdur is based in Koblenz, Germany .

Q: What languages does Abdur speak?

Abdur speaks the following languages: English (Advanced), German (Elementary) .

Q: How many years of experience does Abdur have?

Abdur has at least 4 years of experience. During this time, Abdur has worked in at least 3 different roles and for 3 different companies . The average length of individual experience is 1 year and 3 months . Note that Abdur may not have shared all experience and actually has more experience.

Q: What is Abdur's latest experience?

Abdur's most recent position is Software Engineer, Machine Learning Infrastructure at Retrocausal .

Q: What companies has Abdur worked for in recent years?

In recent years, Abdur has worked for Retrocausal , ibex. , and Virtual Sandbox .

Q: Which industries is Abdur most experienced in?

Abdur is most experienced in industries like Information Technology (IT) .

Q: Which business areas is Abdur most experienced in?

Abdur is most experienced in business areas like Information Technology (IT) and Product Development .

Q: What is Abdur's education?

Abdur holds a Master in Web & Data Science from University of Koblenz and a Bachelor in Computer Science from National University of Computer & Emerging Sciences .

Q: What is the availability of Abdur?

Abdur is immediately available full-time for suitable projects.

Recommended expert

Koblenz, Germany

Experience

Jan 2024 - Apr 2025

1 year 4 months

Redmond, United States

Software Engineer, Machine Learning Infrastructure

Retrocausal

Built a WebSocket progressive streaming pipeline replacing 15+ second blocking fetches with near real time updates.
Deployed Nginx with HLS/RTMP for live and on-demand video: reliability up 35%, latency down 30%, concurrency up 45%, bandwidth down 20%.
Added client-side caching with AWS S3 pre-signed URLs; image loads dropped from about 5,000 ms to under 20 ms, boosting page responsiveness.
Optimized video frame annotation pipeline by introducing Python threading to parallelize S3 uploads, reducing processing time by ~40%.

Jul 2022 - Jan 2024

1 year 7 months

Karachi, Pakistan

Analyst Software Engineer

ibex.

Built a custom URL shortener generating over 1 million unique codes per minute with collision resistance.
Implemented WhatsApp messaging via Twilio Content API with approvals and delivery/read webhooks; reduced invitation costs by 80%.
Migrated APIs from .NET Core 3/5 to .NET 8 and standardized DI/polymorphism/versioning, yielding about 20% faster endpoints and 40% better maintainability.
Drove test-first development with xUnit and CI, cutting release lead time from about 4 hours to under 60 minutes and improving stability.

Jun 2021 - Jul 2022

1 year 2 months

London, United Kingdom

Full Stack Developer

Virtual Sandbox

Designed and built DulyPaid in Laravel: billing/invoicing automation with payment schedules, dunning reminders, reporting, and analytics.
Integrated five accounting systems (Xero, FreshBooks, Sage, FreeAgent, plus one) via REST APIs, webhooks, and scheduled cron syncs; added messaging via Twilio/Nexmo.
Set up Jenkins CI/CD with unit and integration test gates to standardize build, test, and deploy and accelerate releases.
Implemented Redis caching and connection pooling for high availability and low-latency data access.

CNN-powered GI Tract Disease Classification diagnostic system

Built a CNN-powered GI Tract Disease Classification diagnostic system (92% accuracy) using PyTorch and Django.
Designed preprocessing and automated evaluation pipelines and integrated real-time dashboards for visualization and collaboration.

Industries Experience

See where this freelancer has spent most of their professional time. Longer bars indicate deeper hands-on experience, while shorter ones reflect targeted or project-based work.

Experienced in Information Technology (4 years).

Information Technology

Business Areas Experience

The graph below provides a cumulative view of the freelancer's experience across multiple business areas, calculated from completed and active engagements. It highlights the areas where the freelancer has most frequently contributed to planning, execution, and delivery of business outcomes.

Experienced in Information Technology (4 years) and Product Development (4 years).

Information Technology

Product Development

Summary

Results-oriented Full Stack Engineer with expertise in scalable systems, cloud-native development, and AI/ML integration. Proven track record of delivering high-performance, secure applications, including NLP-driven sentiment analysis, customer-support chatbots, and API-first data pipelines built with REST, webhooks, and automation. Skilled at driving measurable improvements in performance, reliability, and team productivity.

Skills

Programming: Python, C#, Java, Javascript/typescript, Php, Sql, Html/css
Frameworks & Libraries: .Net Core, Asp.net Core, Node.js, React.js, Vue.js, Django, Flask
Cloud & Devops: Azure, Aws, Gcp, Docker, Kubernetes, Jenkins, Ci/cd Pipelines, Terraform
Databases: Postgresql, Mysql, Redis (Sql & Nosql)
Software Engineering: Testing, Debugging, Performance Evaluation, Data Visualization
Other: Microservices Architecture, Cloud-native Development, Problem Solving, Cross-team Collaboration

Languages

English

Advanced

German

Elementary

Education

Oct 2025 - Present

University of Koblenz

Master’s in Web & Data Science · Web & Data Science · Koblenz, Germany

Oct 2018 - Jun 2022

National University of Computer & Emerging Sciences

Bachelor’s in Computer Science · Computer Science · Pakistan

Profile

Created

October 2025

Need a freelancer? Find your match in seconds.

Try FRATCH GPT

Frequently asked questions

Do you have questions? Here you can find further information.

Where is Abdur based?

Abdur is based in Koblenz, Germany.

What languages does Abdur speak?

Abdur speaks the following languages: English (Advanced), German (Elementary).

How many years of experience does Abdur have?

Abdur has at least 4 years of experience. During this time, Abdur has worked in at least 3 different roles and for 3 different companies. The average length of individual experience is 1 year and 3 months. Note that Abdur may not have shared all experience and actually has more experience.

What roles would Abdur be best suited for?

Based on recent experience, Abdur would be well-suited for roles such as: Software Engineer, Machine Learning Infrastructure, Analyst Software Engineer, Full Stack Developer.

What is Abdur's latest experience?

Abdur's most recent position is Software Engineer, Machine Learning Infrastructure at Retrocausal.

What companies has Abdur worked for in recent years?

In recent years, Abdur has worked for Retrocausal, ibex., and Virtual Sandbox.

Which industries is Abdur most experienced in?

Abdur is most experienced in industries like Information Technology (IT).

Which business areas is Abdur most experienced in?

Abdur is most experienced in business areas like Information Technology (IT) and Product Development.

What is Abdur's education?

Abdur holds a Master in Web & Data Science from University of Koblenz and a Bachelor in Computer Science from National University of Computer & Emerging Sciences.

What is the availability of Abdur?

Abdur is immediately available full-time for suitable projects.

What is the rate of Abdur?

Abdur's rate depends on the specific project requirements. Please use the Meet button on the profile to schedule a meeting and discuss the details.