Abdur Rafay-Software Engineer, Machine Learning Infrastructure
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Experience
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%.
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.
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.
Industry experience
See where this freelancer has spent most of their professional time.
Experienced in Information Technology.
Business area experience
See which departments and functions this freelancer has contributed to most.
Experienced in Information Technology and 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
Education
University of Koblenz
Master’s in Web & Data Science · Web & Data Science · Koblenz, Germany
National University of Computer & Emerging Sciences
Bachelor’s in Computer Science · Computer Science · Pakistan
Statistics
Experience
Global experience
Expertise
Qualifications
Profile
Frequently asked questions
Have questions? Find more information here.
Abdur is based in Koblenz, Germany.
Abdur speaks the following languages: English (Advanced), German (Elementary).
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.
Based on recent experience, Abdur would be well-suited for roles such as: Software Engineer, Machine Learning Infrastructure, Analyst Software Engineer, Full Stack Developer.
Abdur's most recent position is Software Engineer, Machine Learning Infrastructure at Retrocausal.
In recent years, Abdur has worked for Retrocausal, ibex., and Virtual Sandbox.
Abdur is most experienced in industries like Information Technology.
Abdur is most experienced in business areas like Information Technology and Product Development.
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.
The availability of Abdur needs to be confirmed.
Daily rate distribution
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Average rates for similar positions
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The average daily rate is the mean of all daily rates from recent contracts of comparable freelancers on our platform.
The median daily rate is the middle value of all daily rates — half of comparable freelancers charge less, half charge more. Unlike the average, it is barely affected by outliers.
Calculated based on our freelancers’ daily rates as of 30 Aug 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
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