Kalin Stoev

Full-Stack Architect | AI & Mobile Systems @ xHeal.ai

October 2024 - Present | Miami, FL (Remote)

Architected and shipped production AI-powered healthcare platform transforming reactive healthcare into proactive wellness management through intelligent data unification and personalized recommendations.

• Architected entire React Native application from scratch following iOS Human Interface Guidelines and best practices, implementing scalable architecture with Zustand for global state management and modular component
• Designed comprehensive database schema and AI workflow architecture enabling seamless data flow
• Designed and launched production app to US App Store with 5000+ active users, 99.9% uptime, and 4.8★ average rating
• Integrated Apple HealthKit API enabling real-time bidirectional synchronization of 50+ health metrics (heart rate, sleep patterns, activity levels, nutrition data) across iOS ecosystem

Lead AI Software Engineer @ ApplauseLab

October 2024 - Present | Remote

Leading architecture and development of next-generation AI-powered wellness and career development platforms, building intelligent systems that transform how people make life decisions and manage their health proactively.

• Architected and shipped xHeal - first-ever AI Wellness Companion unifying medical, fitness, mental health, and nutrition data into one intelligent platform (live on US App Store, 1000+ users, 99.9% uptime)
• Architected and shipped MindNest - AI-powered mindfulness and career development companion helping users make career-aligned life decisions through personalized AI workflows
• Designed fully scalable full-stack architecture across both platforms including AI agent workflows, mobile applications (React Native), cloud infrastructure (AWS Lambda/ECS), and real-time data synchronization

CEO & Founder @ BrainTech LTD

September 2022 - Present | Remote

Founded and scaled boutique technology consultancy from 0 to 15+ enterprise clients, delivering AI-native applications and digital transformation solutions across B2B, B2C, and B2B2C domains.

• Reduced ITSM ticket resolution time by 40% through custom SAP-ServiceNow integration serving 100+ enterprise clients across financial services and healthcare
• Architected Flowlink - real-time ETL data pipeline processing hierarchical enterprise data with Kafka, enabling multi-tenant ServiceNow IRE workflows for Fortune 500 clients
• Designed and deployed custom CI/CD pipelines supporting SAFe/Agile frameworks, reducing deployment time from 4 hours to 13 minutes (94% improvement)
• Delivered 20+ technical workshops on ServiceNow, AI systems, and cloud architecture to 270+ engineering professionals
• Built AI-native applications with custom agent workflows, SOA architecture and more.

Co-Founder & Technical Lead @ BalchikCon

August 2023 - Present | Balchik, Bulgaria

Co-founded and scaled one of Bulgaria’s fastest-growing IT conference from 0 to 300+ attendees with 85% YoY growth, establishing platform for emerging tech talent development and industry networking.

• Grew conference from idea to 300+ attendees in first year, achieving 85% year-over-year growth through strategic marketing and community engagement
• Delivered 4 technical keynotes on AI systems and career development to 500+ aspiring engineers or soon to be engineers.
• Participated in the whole event management and organisation, connected with founders, owners and sponsors.

Senior IT Consultant @ Inetum (ex. Do IT Wise)

December 2023 - June 2025 | Sofia, Bulgaria (Remote)

Led enterprise ITSM transformation initiatives for Fortune 500 clients, integrating SAP ERP with ServiceNow platform to streamline operations and reduce incident resolution times by 40%.

• Architected bidirectional SAP-ServiceNow integration processing 10K+ tickets monthly, reducing mean time to resolution from 48h to 29h (40% improvement)
• Delivered 12+ workshops to 200+ engineers and stakeholders on ServiceNow best practices, Agile methodologies, and digital transformation strategies
• Designed automation workflows that reduced manual ticket routing by 70%, saving 1000+ engineering hours annually
• Mentored 4 junior engineers, with 3 promoted to mid-level roles within 12 months through technical guidance and daily code reviews
• Collaborated with C-level stakeholders across 3 enterprise clients to align technical solutions with business objectives

FullStack Software Engineer @ PSIT No Software

February 2023 - December 2023 | Trondheim, Norway (Remote)

Led strangler fig migration of 15-year legacy Visual Basic/C# monolith ERP system to event-driven microservices architecture, enabling 17x faster feature development velocity and 99.9% uptime.

• Architected and executed strangler fig pattern migration, decomposing 200K+ LOC monolith into 12 microservices without downtime for 900+ active users
• Designed event-driven architecture using RabbitMQ and domain-driven design patterns, reducing inter-service coupling by 80%
• Built modern frontend with Angular and DevExtreme library, improving page load times from 8s to 1.1s (88% improvement) and increasing user satisfaction scores by 43%
• Implemented comprehensive testing strategy (unit, integration, E2E) achieving 85% code coverage and reducing production bugs by 60%
• Collaborated in Agile team using Jira and Git, delivering 20+ features across 9 sprints with 95% on-time delivery rate

FullStack Software Engineer @ bet365

March 2022 - September 2022 | Sofia, Bulgaria (Remote)

Engineered zero-downtime C# to Go migration pipeline with automated code transformation for high-traffic gaming platform serving 45M+ users globally, maintaining 99.99% uptime during transition.

• Built automated migration pipeline enabling instant C# to Go microservice transformation with dual-runtime support, migrating 25+ services without user-facing downtime
• Participated in the architecture of backwards-compatible API gateway routing traffic between C# and Go services, enabling gradual rollout with real-time failover capabilities
• Optimized Go services achieving 3x better throughput (15K to 45K req/s) and 60% reduction in memory footprint compared to C# baseline
• Designed high-performance data integrations using stored procedures and caching strategies, reducing database load by 40% for 100M+ daily transactions
• Collaborated with QA team to develop comprehensive testing framework, achieving 95% test coverage and zero production incidents during migration

Software Engineer @ Sensata Technologies

December 2020 - March 2022 | Sofia, Bulgaria

Engineered production-grade HMI software and PLC control systems for Hyundai & Bosch automotive assembly lines, managing critical manufacturing processes producing 50K+ sensors daily with 99.8% quality rating.

• Developed from scratch HMI software controlling 4 assembly lines, reducing manual quality checks by 80% and increasing throughput by 35% (from 800 to 1,080 units/hour)
• Programmed PLC systems for real-time machine control and monitoring, achieving 99.8% uptime across 3 production facilities
• Built IoT data collection platform processing 1M+ sensor readings daily, enabling predictive maintenance and reducing unplanned downtime by 45%
• Designed internal web applications with ASP.NET Core and React for production monitoring, providing real-time dashboards to 400+ factory operators inside Sensata’s factory in Botevgrad

Software Engineer Intern @ Embassy of the United States in Bulgaria

April 2018 - December 2019 | Sofia, Bulgaria

Designed and deployed first-of-its-kind enterprise issue tracking system for US State Department, serving 270+ US Embassies worldwide and processing ~5K+ tickets monthly across global diplomatic operations.

• Architected globally-deployed Management Control System from scratch using ASP.NET Core MVC, Entity Framework, MSSQL and MS Azure stack
• Reduced average issue resolution time by 50% (from 14 days to 7 days) through streamlined workflows and automated notifications