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Ahmed Salah El-Afifi
Verified Expert in Engineering
Software Developer
Cairo, Cairo Governorate, Egypt
Toptal member since October 14, 2020
Bio
Ahmed has over a decade of experience as a software engineer developing apps using various stacks, languages, and technologies. He has extensive knowledge of mathematics and statistics and has worked on high-scale distributed apps. Ahmed excels with projects that have large amounts of data and require wrangling, filtering, retrieving, and analyzing. He enjoys mentoring other developers and finding the best possible solutions for every job, be it performance, UI/UX, or legacy code-related.
Portfolio
OnCorps, Inc.
Python, Pandas, Databricks, Amazon S3 (AWS S3), Jupyter Notebook...
Grouparoo, Inc.
Node.js, TypeScript, CRM APIs, API Integration, JavaScript, Testing...
CPM Educational Program
Node.js, Socket.IO, React, Redis, JavaScript, TypeScript, CRDT, Scaling...
Experience
- Python - 11 years
- MySQL - 11 years
- Node.js - 9 years
- Express.js - 8 years
- MongoDB - 7 years
- TypeScript - 7 years
- Socket.IO - 7 years
- PostgreSQL - 6 years
Preferred Environment
Docker Compose, Git, JetBrains IDE, Ubuntu, Python, Node.js, Docker, MacBook, GitHub
The most amazing...
...project I've worked on is a data wrangler that provides a new method of filtering, tagging, retrieving, and analyzing data.
Work Experience
Python Back-end Developer
2022 - 2025
OnCorps, Inc.
- Improved performance of key data workflows through strategic optimizations.
- Enabled greater consistency between development and production environments by modularizing core logic.
- Provided key architectural contributions and built internal tooling that became foundational to multiple team workflows.
- Built and maintained hundreds of modular validation functions to verify the integrity and consistency of structured data extracted from documents.
- Designed and implemented a reusable internal Python module shared across multiple projects, reducing redundancy and enabling consistent local and remote execution environments.
- Led the re-architecture of the execution framework — migrating from legacy patterns to a modern, extensible design, while preserving backward compatibility and improving team velocity.
- Introduced mechanisms to handle missing or incomplete data with greater transparency, which significantly improved issue tracking and debugging.
- Acted as a key technical advisor on the feasibility and design of new features, helping balance technical effort with business value.
- Helped resolve ambiguities in requirement definitions by collaborating closely with non-technical team members and translating business needs into scalable technical designs.
- Delivered knowledge transfer sessions and technical onboarding support to other developers, ensuring continuity and understanding of complex system behaviors.
Technologies: Python, Pandas, Databricks, Amazon S3 (AWS S3), Jupyter Notebook, System Architecture Design, Modular Design, Agile, APIs, Back-end, Amazon Web Services (AWS), Relational Database Services (RDS), Data Pipelines, ETL
Node.js Developer
2021 - 2022
Grouparoo, Inc.
- Developed and maintained plugins for Grouparoo, enabling seamless data synchronization with various external tools and platforms.
- Integrated diverse APIs, accommodating varying data structures, documentation quality, and rate limits.
- Implemented robust error handling and retry mechanisms to ensure data integrity and system stability in the face of API limitations.
- Created comprehensive unit tests for each plugin, covering diverse scenarios and edge cases to guarantee plugin reliability and functionality.
- Addressed challenges related to primary key discrepancies between Grouparoo and external tools, ensuring accurate record matching and data synchronization.
- Navigated API limitations regarding search and filtration by implementing custom solutions within Grouparoo plugins to ensure efficient data retrieval.
- Developed strategies to manage relationships between data entities (e.g., users and companies) from various sources, resolving inconsistencies and complexities in data representation.
Technologies: Node.js, TypeScript, CRM APIs, API Integration, JavaScript, Testing, Unit Testing, RESTFul APIs, Agile, APIs, Back-end, Relational Database Services (RDS), Test-driven Development (TDD)
Socket.IO Developer
2020 - 2022
CPM Educational Program
- Advised on the architecture of a real-time solution for content sharing, leading to an improved collaboration experience.
- Customized and enhanced the CRDTs package to fulfill project requirements, resulting in optimized functionality for real-time content sharing.
- Developed a scalable environment, incorporating vertical and horizontal scaling techniques to accommodate large-scale content sharing between different users.
- Designed a session management system for collaborative sessions, enhancing the learning experience for the users.
- Overcame challenges related to offline users, ensuring a good balance between content availability and consistency, resulting in a seamless user experience.
- Addressed data persistence challenges, enabling the ability to track individual contributions within shared documents without compromising the storage.
- Devised an intelligent approach to handle the limitations of the used technologies without compromising algorithm functionality.
- Developed a timeout mechanism for idle users during sessions, optimizing session management.
- Streamlined the integration process for front-end developers through ready-to-use packages and components, eliminating the need for an in-depth understanding of the underlying protocol.
Technologies: Node.js, Socket.IO, React, Redis, JavaScript, TypeScript, CRDT, Scaling, Kubernetes, RESTFul APIs, Web Development, Agile, APIs, Back-end, Amazon Web Services (AWS), Express.js, Relational Database Services (RDS), React Router, NoSQL
Back-end, Node.js, and API Developer
2021 - 2021
Digital Spring Inc.
- Developed and migrated back-end modules from JavaScript to TypeScript for a large-scale social media platform with hundreds of thousands of active users.
- Built and maintained serverless APIs using AWS Lambda, ensuring scalability and reliability under high traffic.
- Contributed to the LYKA Mall module, focusing on user data management to support shopping features within the app.
- Worked with Swagger-based API documentation to ensure seamless integration with mobile and front-end teams.
- Wrote automated tests for each endpoint to ensure correctness and maintainability.
Technologies: Node.js, JavaScript, REST APIs, Postman, PostgreSQL, Amazon Web Services (AWS), Serverless, AWS Lambda, TypeScript
Senior Software Engineer
2019 - 2021
ICT Cube
- Developed an algorithm to optimize the analysis process on a stream of data, providing the most efficient way of updating and retrieving the analysis results.
- Built a Jira application to integrate with a stream processing software to show real-time analysis results regarding active tasks/cards using Node.js and Socket.IO.
- Supported the building, optimizing, and fixing of issues in data wrangler software.
- Implemented an algorithm to check the compatibility between component versions in a baseline management system.
- Created an integration API using Python which provided a simple interface for other software components written in C#.
- Developed a simple ORM in Python with core functionality and multiple integrations with database servers and other frameworks used to standardize the way of work in the organization.
- Developed a module to perform validation checking for complex scenarios expressed in a simple way.
- Provided integration and E2E tests to check the integrity between system components.
- Participated in the design and architecture of the main products in the organization.
Technologies: Socket.IO, Node.js, Jira, Data Analysis, Envoy Proxy, Elasticsearch, Apache Kafka, C#, PostgreSQL, Docker, Python, Relational Databases, Event-driven Programming, Scripting, Data, TypeScript, RESTFul APIs, Web Development, Agile, SQL, APIs, Back-end, Express.js, Relational Database Services (RDS), JSON Web Tokens (JWT), Axios, SQLAlchemy, ETL, HTML DOM, NoSQL, CSS3, HTML5
Senior Back-end Engineer
2018 - 2019
Infovass
- Integrated several online payment systems using different technologies.
- Implemented extensions for the OpenCart eCommerce framework.
- Fixed issues and performed optimizations in legacy code projects.
Technologies: Firebase, OpenCart, REST, SOAP, Laravel, PHP, Relational Databases, Event-driven Programming, Scripting, RESTFul APIs, Web Development, SQL, APIs, Back-end, Relational Database Services (RDS), Axios, HTML DOM, Angular, Angular Material, CSS3, HTML5
Senior Back-end Engineer
2018 - 2018
ArabiaNet
- Assisted in converting assets management from manual methods into Gulp and Bower.
- Developed websites for customers in several business fields.
- Built a CMS that provides high flexibility with good UX to make it easy for both UI designers and clients to customize websites.
- Built an internal system to manage projects and tasks.
- Configured hosting servers on which to install clients' websites.
- Built RESTful APIs for web and mobile applications.
- Mentored junior developers through technical challenges and trained them on using new tools and technologies.
Technologies: REST, Vue, AngularJS, eCommerce, Bower, Gulp, Laravel, PHP, Relational Databases, Event-driven Programming, Scripting, RESTFul APIs, Web Development, SQL, APIs, Back-end, Relational Database Services (RDS), Axios, HTML DOM, Angular, Angular Material, CSS3, HTML5
Senior Software Developer
2017 - 2017
ProBranding
- Developed websites for customers in the medical field.
- Configured hosting servers on which to install clients' websites.
- Created a mini-ERP system for small clinics as a desktop app using node-webkit (NW.js) with AngularJS for the front end.
Technologies: AngularJS, Node.js, NW.js, CSS, JavaScript, HTML, PHP, Relational Databases, Event-driven Programming, Scripting, RESTFul APIs, Web Development, SQL, APIs, Back-end, Relational Database Services (RDS), Axios, HTML DOM, jQuery, Angular, CSS3, HTML5
Software Developer
2015 - 2017
UAS Hospitals
- Transformed a legacy system into a new one with better functionality and performance and far better UI/UX.
- Created a RESTful API for the mobile application with high security in consideration.
- Solved performance issues by redesigning parts of the database and redefining how the data should be indexed.
- Implemented scripts to migrate the old database to the new one.
- Developed an algorithm to optimize the search process in Arabic names with specific criteria.
- Created cron jobs to schedule sending notifications for patients and doctors.
- Led and mentored other team members through technical issues.
Technologies: MySQL, CSS, HTML, JavaScript, PHP, Relational Databases, Event-driven Programming, Scripting, Data, RESTFul APIs, SQL, APIs, Back-end, Relational Database Services (RDS), Axios, HTML DOM, jQuery, CSS3, HTML5
Experience
HA-Pharma
HA-Pharma is a pharmacy management system that provides a simple UI, allowing the non-experienced user to perform complex operations in simpler ways and obtain informative reports that improve the overall process.
It has been built as a desktop application using NW.js with Node.js for the back end and Angular for the front end. Some portions in the back end were implemented as Node.js add-ons using C++ and a V8 engine for security purposes.
It has been built as a desktop application using NW.js with Node.js for the back end and Angular for the front end. Some portions in the back end were implemented as Node.js add-ons using C++ and a V8 engine for security purposes.
eval-magic — Open-source NPM Package
https://github.com/aelafifi/eval-magicAn open-source TypeScript package that extends JavaScript’s eval with more flexible and Python-inspired behavior.
• Supports Python-style “magic methods” (operator overloading in JavaScript).
• Enables export-based execution inside evaluated code (no need for return).
• Lets you pass a custom scope object to be used within the eval (while still keeping access to the global scope).
• Provides a hook for handling import statements via a user-defined resolver function.
• Supports Python-style “magic methods” (operator overloading in JavaScript).
• Enables export-based execution inside evaluated code (no need for return).
• Lets you pass a custom scope object to be used within the eval (while still keeping access to the global scope).
• Provides a hook for handling import statements via a user-defined resolver function.
Skills
Libraries/APIs
jQuery, Node.js, REST APIs, Socket.IO, Vue, Pandas, NumPy, Chrome API, React, RxJS, Vue 3, React Router, SQLAlchemy, NW.js, React Redux
Tools
Docker Compose, NPM, Sublime Text, PhpStorm, WebStorm, PyCharm, Git, GitHub, Webpack, Bitbucket, GitLab, RabbitMQ, Babel, Jupyter, Envoy Proxy, Jira, Gulp, Bower, V8, CircleCI, Postman
Languages
Python, PHP, HTML, CSS, JavaScript, CSS3, HTML5, SQL, Less, PHP 7, ECMAScript (ES6), Python 3, Sass, TypeScript, SCSS, Dart, C#, Bash, Go, Java, C++
Frameworks
Express.js, Bootstrap, Bootstrap 3, JSON Web Tokens (JWT), Angular, Angular Material, Flask, Laravel, AngularJS, Scrapy, Redux
Paradigms
Event-driven Programming, Modular Design, Test-driven Development (TDD), HTML DOM, Microservices, Agile, ETL, REST, Testing, Unit Testing
Storage
MySQL, NoSQL, JSON, Relational Databases, PostgreSQL, MongoDB, SQLite, Redis, Data Pipelines, Elasticsearch, Amazon S3 (AWS S3)
Platforms
Ubuntu, Linux, Jupyter Notebook, Visual Studio Code (VS Code), Databricks, Docker, Apache Kafka, OpenCart, Firebase, Kubernetes, Amazon Web Services (AWS), AWS Lambda
Other
JetBrains IDE, APIs, Ajax, WebSockets, Full-stack, Back-end, Web Scraping, Scraping, Data Scraping, Scripting, Data, API Integration, RESTFul APIs, Web Development, Axios, Source Code Parsing, Message Queues, Cloud, Statistics, Data Engineering, Chrome Extensions, CRDT, CI/CD Pipelines, Scaling, System Architecture Design, Abstract Syntax Trees (AST), Relational Database Services (RDS), Open Source, AI Agents, Data Analysis, eCommerce, SOAP, GitHub Actions, CRM APIs, MacBook, Serverless
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