Open to Opportunities

Abdallah Selim

Software Engineer specializing in high-performance backend systems, microservices, and data pipelines. Polyglot engineer with Microsoft & Cegedim experience.

Python C# Javascript .NET Django PostgreSQL Docker

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Abdallah Selim

Software Engineer · Cairo, Egypt

1600+

Problems Solved

Companies

3.52

GPA / 4.0

Open to new roles in 2026

Who I Am

About Me

Engineer, competitive programmer, and open-source contributor.

I'm Abdallah Selim, a Software Engineer with production experience at Microsoft and Cegedim, specializing in high-performance backend systems, microservices architecture, and data pipelines.

I'm a polyglot engineer comfortable in Python, C#, Go, and TypeScript, with a strong foundation in algorithms and distributed infrastructure. I've contributed to Microsoft's .NET Aspire open-source project and love solving hard problems — over 1,600 on Codeforces alone.

Python / Django C# / ASP.NET React.js PostgreSQL Docker Redis

Companies

1600+

CF Problems

1yr

Experience

Career

Experience

Production-grade engineering across data, backend, and full-stack domains.

Cegedim

Software Engineer Intern — Data Engineering

Jul 2024 – Sep 2024 · Cairo, Egypt

Architected high-throughput data pipelines using Apache Spark and Kafka, achieving 154 MB/s throughput on large-scale datasets.
Integrated LLM APIs and NLP models to automate GDPR-sensitive data detection, reducing manual compliance workload by 84% with 91% accuracy.
Designed scalable ETL workflows capable of migrating a 65 GB database in under 7 minutes, ensuring minimal downtime for critical systems.

Microsoft

Software Engineer Intern — InboxCoupons Team

Jul 2023 – Sep 2023 · Cairo, Egypt

Developed full-stack enterprise tooling using TypeScript (React) and ASP.NET Core, improving internal operational efficiency.
Implemented complex data aggregation logic on Cosmos DB and Kusto (Big Data Analytics) to power real-time reporting dashboards.
Collaborated with cross-functional teams to refactor legacy codebases, enhancing system maintainability and component reusability.

Bld.ai

Software Engineer (Promoted from Intern)

Aug 2022 – Jul 2023 · Remote

Promoted to Part-Time Software Engineer after a 3-month internship; spearheaded backend development for high-traffic B2B SaaS platforms.
Built a company incorporation platform for Singapore using Django (Python) and React.
Integrated Stripe Payments and automated document generation workflows for shareholder registration.
Utilized Redis and Celery for asynchronous task management, improving scalability and response times.

.NET Aspire — Microsoft Open Source

Open Source Contributor · Merged PR #14006

2024

Resolved race conditions in CertificateTrustExecutionConfigurationGatherer within Microsoft's cloud-native stack.
Refactored exception handling to correctly map ObjectDisposedException to OperationCanceledException during startup.

My Work

Projects

Systems-level projects demonstrating distributed architecture, performance engineering, and database internals.

High-performance event-driven observability platform.

Engineered a Go ingestion service handling 20,000+ requests/second via optimized batching and async Kafka production.
Orchestrated a distributed stack (Postgres, Zookeeper, Grafana) using Docker Compose for robust fault tolerance.

View on GitHub

Distributed microservices hiring backend system.

Implemented event-driven microservices (Identity, Job, Applications) using ASP.NET Core and Apache Kafka.
Built an API Gateway for secure, unified RESTful endpoint exposure; each service owns its isolated PostgreSQL DB.

View on GitHub

File-based relational database engine built from scratch.

Developed a SQL query parser and execution engine with custom binary file storage system.
Implemented B-Tree indexing for O(log n) lookups, demonstrating deep knowledge of database internals.

View on GitHub

High-performance HTTP server using system-level concurrency primitives.

Implemented thread pooling with synchronization to prevent race conditions and ensure safe shared resource access.
Designed custom request parsing and scheduling logic, profiling to resolve performance bottlenecks under load.

View on GitHub

Toolbox

Tech Stack

Technologies I use to architect reliable, high-performance systems.

Languages

Python Go C# C++ JavaScript / TypeScript SQL

Backend & Frameworks

Django FastAPI ASP.NET Core RESTful APIs Microservices Event-Driven Architecture

Data & Messaging

Apache Kafka Apache Spark Redis Celery ETL Pipelines

Databases & DevOps

PostgreSQL MySQL MongoDB Cosmos DB Docker CI/CD (GitHub Actions) Linux Git

Recognition

Achievements

Competitive programming, mentorship, and academic excellence.

⚡

Codeforces Specialist

Solved 1,600+ problems with a peak rating of 1,460 — demonstrating elite algorithmic problem-solving.

1600+

🏆

ECPC Top Ranker

Ranked 54th (2022) and 60th (2023) in the Egyptian Collegiate Programming Contest among 150+ teams.

#54

🎓

Honors Graduate

B.Sc. Computer Engineering from Menoufia University with GPA 3.52/4.0 — Excellent with Honors.

3.52

🤝

ICPC Mentor & Problem Setter

Volunteering as ICPC Mentor and Problem Setter for Menoufia University Community since 2022.

2022–

🔀

Microsoft Open Source

Merged PR #14006 in .NET Aspire — resolved race conditions in cloud-native certificate trust execution.

PR #14006

📊

Data Pipeline Performance

Engineered pipelines at Cegedim achieving 154 MB/s throughput and migrating 65 GB in under 7 minutes.

154 MB/s