Mahmoud Sayed

Senior Software Engineer

7 years crafting scalable backend systems, optimizing performance, and leading technical initiatives

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About Me

I'm a Senior Software Engineer with over 7 years of experience building robust backend systems and leading technical initiatives. Currently at Accredible, I develop backend systems which serve millions of users and process millions of records. My expertise spans from building real-time analytics dashboards to migrating applications to modern cloud infrastructure (eg: Elasticbeanstalk to ECS)

As a vetted member of Toptal's exclusive network of top 3% software engineers, I have delivered high-impact solutions for leading technology companies including Zeus Living, Corsair Gaming, and Owens Corning. Through these engagements, I've enhanced GraphQL APIs, optimized critical endpoints, and implemented robust authentication systems while maintaining the highest standards of code quality and testing.

My journey began with competitive programming, where I qualified for the ICPC World Finals and earned various medals and placements. This foundation in algorithms and problem-solving continues to drive my approach to engineering challenges.

I specialize in performance optimization, distributed systems, and DevOps practices and initiatives. From reducing page load times by 10x to architecting real-time analytics dashboards, I'm passionate about creating efficient, scalable solutions.

7

Years Experience

10x

Performance Gains

ICPC

World Finals Qualifier

TOP 3% TALENT

Vetted by Hire me

Professional Experience

Dec 2020 - Present

Senior Software Engineer

Accredible

  • Partnered with the insights team to architect and deliver a high-performance analytics dashboard utilizing distributed PostgreSQL with Citus extension.
  • Led development of the "Transcripts" feature for secure generation and sharing of verified academic-like transcripts
  • Orchestrated critical infrastructure modernization initiatives, including the migration of the primary application from AWS Elastic Beanstalk to Amazon ECS for improved scalability and container orchestration. Additionally, architected and executed the migration of the entire analytics infrastructure to an isolated AWS account, enhancing security posture and operational efficiency
  • Contributed to establishing comprehensive observability using Grafana Alloy, Tempo, Prometheus, and OpenTelemetry across polyglot services
  • Designed sophisticated billing credit distribution system and built foundational Kafka consumers
  • Created first modular component leading architectural evolution toward modular-monolith patterns
  • Optimized search endpoints with Elasticsearch and developed standardized LTI 1.3 integration framework
June 2021 - April 2022

Senior Software Engineer (Freelance)

Toptal

  • Delivered full-stack features for Zeus Living, Corsair Gaming, and Owens Corning through Toptal's exclusive network
  • Enhanced GraphQL APIs and improved authentication systems using omniauth
  • Integrated ClickUp for enhanced task management workflows
  • Optimized endpoint performance and significantly increased test coverage
  • Resolved critical user experience bugs and improved overall application stability
Jan 2019 - Nov 2020

Software Engineer

Iubenda

  • Achieved 10x page load time reduction through SQL query optimization and strategic caching
  • Improved help post response times by 4x using full-text search and indexing strategies
  • Designed and implemented robust licensing system with multi-user access controls
  • Integrated major payment gateways including PayPal and Braintree
  • Automated cache purging processes for fragment cache keys
  • Refactored and optimized multiple backend modules for better maintainability
Dec 2017 - Dec 2018

Software Engineer

National Company for Roads

  • Developed critical infrastructure systems for national tolling operations
  • Designed and maintained databases ensuring data integrity for critical infrastructure
  • Built desktop and web applications supporting core tolling operations
  • Managed database replication systems for high availability
  • Collaborated on government-level infrastructure projects
Sep 2016 - Oct 2017

Software Engineer

Lifeblink

  • Improved database read performance through query optimization, index redesigning, and table restructuring
  • Implemented caching mechanisms achieving 6x faster page load speeds
  • Enhanced user experience with asynchronous pagination and infinite scrolling via AJAX
  • Built the "Life Group" feature from ground up, adding key functionality
  • Integrated payment processing using ActiveMerchant and PayPal
  • Resolved multiple design and logic issues improving system stability
Oct 2015 - Aug 2016

Software Developer Intern

eTurn - Appenza Studio

  • Handled bug fixing and feature development for Rails/AngularJS Learning Management System
  • Integrated admin panel system into LMS application
  • Gained foundational experience in full-stack web development
  • Collaborated with senior developers on complex application features

Achievements & Certifications

🏆
2017

ICPC World Finalist

Qualified and competed in the ACM ICPC World Finals, representing among the top collegiate programmers globally

View ICPC Profile →
🥉
2016

Bronze Medal - ACPC

Earned Bronze Medal at the Arab Collegiate Programming Contest (ACPC)

Technical Skills

Backend Systems

Ruby on Rails Node.js Go GraphQL REST APIs

Databases & Caching

PostgreSQL Citus MySQL Redis ElasticSearch

Distributed Systems

Kafka Message Queues Event-Driven Architecture Microservices

Cloud & Infrastructure

AWS (ECS, RDS, S3) Docker Terraform GitHub Actions CircleCI

Observability & Monitoring

OpenTelemetry Prometheus Grafana Tempo NewRelic

Frontend (Full-Stack)

Vue.js Next.js React Native JavaScript

Projects

Tashteb

A mobile and web application that enables interior design and finishing companies to effortlessly track expenses, share progress updates with clients, and generate expense reports, delivering a smoother, more professional experience for both engineers and unit owners.

PostgreSQL Go React Native

ECare Mobile Application

Developed healthcare app for chronic disease management with automated notifications and real-time caregiver tracking.

Mobile Development Real-time Tracking Healthcare

Get In Touch

I'm always interested in discussing new opportunities, technical challenges, or potential collaborations.

Email LinkedIn GitHub Toptal