and education. Specialized in backend systems, cloud infrastructure, APIs, and production AI solutions supporting thousands of users. Proven track record of accelerating API performance by 40% and launching 4 production-ready AI features, with a focus on reliability, maintainability, scalability, and measurable business value.

Stoyan Ivanov Stoychev

and education. Specialized in backend systems, cloud infrastructure, APIs, and production AI solutions supporting thousands of users. Proven track record of accelerating API performance by 40% and launching 4 production-ready AI features, with a focus on reliability, maintainability, scalability, and measurable business value.

Available to hire

and education. Specialized in backend systems, cloud infrastructure, APIs, and production AI solutions supporting thousands of users. Proven track record of accelerating API performance by 40% and launching 4 production-ready AI features, with a focus on reliability, maintainability, scalability, and measurable business value.

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Work Experience

Senior Backend & AI Engineer at Upwork / Freelancer
March 1, 2025 - Present
Delivered and deployed 10+ AI-enabled full-stack applications across financial services, CRM, and document automation using Python, Flask, Next.js, Node.js, MongoDB, and SQL databases. Engineered AI-powered financial services supporting 25K+ users with fraud detection, personalized recommendations, and intelligent document workflows with compliance requirements. Built document-processing pipelines combining AI extraction, rule-based validation, and approval workflows, reducing administrative work by up to 80% and errors by 25%. Designed real-time anomaly detection reducing false-positive alerts by 45%. Modernized legacy CRM systems with Node.js and Angular, optimizing performance up to 95% and increasing daily user engagement by 21%. Streamlined cloud deployment with AWS, Docker, Lambda, S3, and CI/CD, reducing deployment time by up to 40% while mentoring 6 junior developers.
Senior AI Engineer at CVS Health
October 1, 2023 - March 1, 2025
Engineered microservices and backend services powering 10+ AI-enabled healthcare workflows integrating language models for 500+ internal users including clinical teams. Launched 4 production-ready AI features across 8+ operational and clinical workflows using scalable service and asynchronous processing patterns. Accelerated API performance by 40% via query optimization, caching, and backend refactoring across microservices. Architected reusable AI service components across 5+ applications with standardized integration patterns for production LLM capabilities. Improved reliability through architecture reviews, code reviews, observability practices, and testing strategies, reducing recurring maintenance issues.
Senior Software Engineer at CMA CGM
May 1, 2022 - October 1, 2023
Developed 13+ backend services supporting shipment tracking, customer communication, and logistics workflows processing 100K+ requests per day. Orchestrated 10+ API integrations between internal systems and external partners, reducing onboarding/integration effort by 30%. Built 8+ customer-notification workflows using Twilio, cutting manual operational work by ~20 hours/week. Scaled backend workloads to 150K+ requests/day through database design improvements, optimized data-access patterns, caching, and high-availability architecture, increasing throughput by 40%. Coordinated delivery across 3+ time zones with 10+ engineers, contributing to 20+ production releases and deployments.
Senior Software Engineer at Southern Glazer’s Wine & Spirits
August 1, 2021 - April 1, 2022
Implemented 12+ backend services for enterprise e-commerce applications on AWS supporting 50K+ daily transactions. Optimized database queries and Redis-style caching patterns, decreasing API response times by 35% and reducing database load by 30%. Created 7+ reusable service interfaces/APIs enabling frontend teams to deliver 10+ customer-facing features while maintaining clear boundaries across distributed backend services. Strengthened production stability across 10+ major releases using architecture planning, code reviews, testing, observability, and production support, reducing release-related incidents by 25%. Delivered 15+ ordering/inventory/customer-operation features using scalable backend and asynchronous processing patterns, contributing to an estimated 20% workflow efficiency improvement.
Senior Software Engineer at The College Board
July 1, 2015 - July 1, 2021
Architected backend systems for 10+ large-scale education applications supporting 500K+ students, educators, and administrators. Modernized 8+ legacy applications with AWS cloud-native services and event-driven architectures using asynchronous processing, reducing infrastructure and operational overhead by ~30%. Secured 20+ APIs and backend services spanning authentication, reporting, and data-processing workflows across 10+ internal products. Streamlined 15+ deployment and infrastructure workflows, shortening deployment time by 50% and reducing release failures/manual steps by 35%. Partnered with 8+ cross-functional teams to deliver 14+ major features and releases across system design, implementation, deployment, observability, and production support.

Education

Bachelor of Science in Computer Science at Technical University of Sofia
January 1, 2011 - January 1, 2015

Qualifications

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Industry Experience

Healthcare, Financial Services, Education, Transportation & Logistics, Software & Internet