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Seif Hesham Salem

@seifheshamsalem

Senior Full Stack Software Engineer at Vesynta Health Tech, improving healthcare software quality through refactoring, security updates, and E2E testing.

Egypt

Message

At Vesynta Health Tech, I help advance healthcare software compliance reviews, refactor caching and performance bottlenecks, and update legacy code while maintaining backward compatibility.

Previously, I optimized systems at Mazadat, including improving the view counter’s speed by 70%. In freelance projects, I created a course management system that increased a client’s revenue by more than 200%, and contributed to AI-powered search, proposal generation, and chatbot projects.

Experience

Work history, roles, and key accomplishments

Current

Senior Full Stack Software Engineer

Current

Vesynta Health Tech

Dec 2025 - Present (10 months)

Conducting compliance reviews for healthcare software, refactoring caching and performance-critical components, cleaning up legacy code, performing security updates, and setting up self-hosted runners for E2E testing with Playwright and Newman.

Compliance Refactoring Legacy Code Security Playwright Newman E2E Testing CI CD

Senior Software Engineer

AllUp Cloud

Feb 2025 - Dec 2025 (10 months)

Set up performance monitoring and optimization using Kibana APM, refactored legacy microservices infrastructure (15 services) into a monolith, and integrated new features while maintaining migration from legacy code.

Elastic APM Performance Monitoring Microservices Monolith Refactoring Feature Integration

Freelance Backend Developer

Nexus RFP

May 2025 - Jun 2025 (1 month)

Scraped U.S. government websites for contract opportunities, developed an AI-powered proposal generation backend, built a search and matching system, automated daily scraping, and deployed with CI/CD using AWS AppRunner and CodeBuild.

Python fastAPI PostgreSQL Pgvector Alembic SQLAlchemy AWS App Runner AWS CodeBuild AWS RDS EC2 OpenAI Lang Chain JavaScript GitHub Actions

Junior to Mid-Level Software Engineer

Mazadat

Oct 2022 - Jan 2025 (2 years 3 months)

Optimized system architecture to achieve 70% faster view counter, improved Node.js/Express/Redis/MongoDB/AKS stack performance, redesigned content pipeline to reduce update cycle from two months to one week, implemented data seeders, and participated in Agile ceremonies.

NodeJS ExpressJS Redis MongoDB AKS Performance Optimization Agile Docker Kubernetes Azure DevOps

Freelance Full Stack Developer

Al Nafa Law Firm Group

Nov 2024 - Dec 2024 (1 month)

Developed a comprehensive web application using NextJS and Strapi CMS, configured Hostinger VPS and nginx for multi-domain hosting, and automated deployments with GitHub workflows.

Next.js Hostinger VPS Nginx Git Strapi CMS Figma Tailwind Bootstrap GitHub Actions

Freelance Full Stack Developer

IslamIQ.ai

Jun 2024 - Dec 2024 (6 months)

Scraped approximately 500,000 Fatawa from Islamic websites, managed Azure Cloud servers for production and development, integrated AI services like LiveWhisper, and built a WhatsApp bot with queuing and rate limiting using BullMQ, serving over 44K users.

NodeJS TypeScript JavaScript Python Lang Chain MongoDB PostgreSQL BullMQ Azure OpenAI Azure

Freelance Full Stack Developer

Quality Leaders Academy

Dec 2021 - Sep 2023 (1 year 9 months)

Created a full management courses system with authentication, payments, exams, certificates, and admin dashboard, increasing client revenue by over 200%.