Marinos Dakis Portfolio

Work Experience

Jun 2024 – Present

Engineered a broker operations platform integrating 7 trading platforms using React, Node.js, Python, C++, SQL, and AWS, processing 2.5M+ accounts and 150M+ transactions across brokers and servers.
Prevented significant fraudulent withdrawals by creating 8 compliance reports across brokers.
Replaced a Power BI subscription with internal reporting dashboards, saving $6K/month.
Built a real-time collaborative editor using TipTap, Yjs, and WebSockets with S3 file and image support.
Secured and scaled AWS infrastructure by deploying containerized services on ECS with Docker, an AI LLM instance, an EC2 Bastion SSH tunnel, Redis via ElastiCache, and CI/CD via ECR and CodePipeline, maintaining 99.9% uptime.

Sep 2023 – Present

Built a full-stack application using Next.js, TypeScript, Tailwind CSS, and Redux, deployed on Vercel with Neon PostgreSQL and Redis, reducing page load times by 40%.
Integrated Google AdSense, multilingual support with i18next, and a responsive REST API architecture, increasing site traffic by 75%.
Streamlined backend performance by optimizing database queries and caching strategies, improving data retrieval speed by 50%.

Mar 2023 – May 2024

Built an analytics dashboard using React, PHP, and SQLite3, reducing statement processing time by 80%.
Optimized a PDF generation process with FPDF and jQuery, decreasing execution time by 74%.
Migrated a legacy system from PHP, JavaScript, and SQLite3 to Django, MySQL, and React, improving overall system performance by 80%.
Developed document workflows for upload, validation, and download, cutting manual review time by 40%.

Jan 2022 – Feb 2023

Maintained full-stack applications in an agile environment using JavaScript, TypeScript, React, jQuery, HTML5, CSS3, C#, ASP.NET MVC, and Sitecore, reducing backlog bugs by 70%.
Implemented feature flag management with LaunchDarkly for ordering and payment systems, enabling real-time updates for over 3M+ users.

Aug 2020 – Jan 2021

Increased website traffic by 500% within two months by optimizing webpages and leveraging WordPress plugins such as Elementor and Yoast SEO.
Accelerated the project launch timeline by 10 weeks and reduced outsourcing costs by leading a migration to Bluehost.
Trained board members and interns on website editing, security protocols, and maintenance, ensuring long-term site stability.
Recognized with the Certificate of Excellence, Certificate of Recognition, and Triple C Award for over 100 hours of volunteer technical support.