Mikita Kavaliou
Full Stack Software Engineer & AI Specialist | Java (Spring Boot), Angular, PHP (Laravel & Symfony), Node.js | AWS | Architecting Scalable AI Solutions & Legacy Migrations
Salaire / Taux journalier
Freelance, ouvert au CDI
Expertises
Langues
À propos
Introduction
I am a Full Stack Software Engineer and AI Specialist based in Grenoble, France, with a deep focus on building high-performance, distributed systems. I bridge the gap between robust Enterprise Java ecosystems and modern, reactive Frontend frameworks. Whether I am migrating a PHP monolith to a Java 21/Spring Boot 3 microservices architecture or building real-time AI platforms with Next.js, my focus remains on technical excellence and business impact. I specialize in modernizing legacy systems, orchestrating AI (RAG/LLM), and ensuring strict data security (GDPR, PCI-DSS). 🚀 Career Highlights & Impact: Enterprise Modernization: Led the refactoring of legacy monoliths into Java 21 & Spring Boot 3 using Clean Architecture (DDD/SOLID), reducing regressions by 35% and improving code review speed by 40%. High-Concurrency Systems: Scaled architectures to handle peaks of 1,200 requests/second with 99.95% uptime via AWS and optimized Spring Caching (Redis). AI Innovation: Architected secure AI platforms featuring RAG and LLM orchestration, achieving a Time-To-First-Token (TTFT) of <200ms. FinTech & Payments: Engineered marketplace infrastructures processing $500k+ in monthly GMV via Stripe Connect using Spring Security and complex SQL optimization. Real-Time Performance: Leveraged Project Loom (Virtual Threads) and WebRTC to support 500+ simultaneous audio streams with sub-300ms latency. 💻 Tech Stack & Core Competencies: Java Stack: Java 21, Spring Boot 3, Spring Cloud, Hibernate, JUnit 5, Mockito. Frontend: Angular (15-18, RxJS, NgRx), React 19, Next.js 16, TypeScript, Tailwind CSS. Node & PHP: Node.js, PHP (Laravel 10/11, Symfony 6/7). AI & Data: LLM Gateway, RAG, Vector DBs (Pinecone/Milvus), Kafka, PostgreSQL, Redis. Cloud & DevOps: AWS (EC2, Lambda, RDS), Docker, CI/CD (GitHub Actions). I am fluent in English, French, Polish, and Russian. Always open to discussing complex technical challenges, legacy migrations, or innovative AI integrations. Let’s connect, or view my work at mikita-kavaliou.online!
Expérience de travail
Full Stack Software Engineer | Backend & AI Specialist
BaseSystem
févr. 2024 - mai 2026
2 ans 4 mois
Poland, Maine 04274, États-Unis
Leading the modernization of high-scale architectures and AI integration for SaaS platforms. Key Achievements: • Architecture Migration: Orchestrated the migration of a legacy monolithic application to a modern, decoupled service-oriented architecture (utilizing modern web frameworks, ORMs, and in-memory data stores), maintaining 99.95% availability. • High-Scale Performance: Optimized the system to handle traffic peaks of 1,200 requests/second (RPS) using cloud auto-scaling and distributed in-memory caching. • Backend Optimization: Reduced API response times by 30% for 200k+ active users through advanced database query optimization and backend application server fine-tuning. • Leadership: Led a team of 3 developers, introducing strict type-safety and Clean Architecture principles. Implemented automated testing (E2E and unit testing frameworks) covering 80% of critical paths, reducing regressions by 35%.
Full Stack Developer & AI Consultant (Independent)
Fiverr and Upwork Freelancers (Buyers and Sellers)
janv. 2022 - mars 2024
2 ans 3 mois
Poland, Maine 04274, États-Unis
Provided architectural consulting and full-stack development for FinTech and AI startups. Selected Projects: • ZIRO.FIT (Fitness & Health SaaS): Engineered a scalable microservices architecture for a coaching platform connecting personal trainers with clients. Implemented a secure subscription-based billing system, ensuring PCI-DSS compliance. Leveraged enterprise security frameworks and Strategy/Factory design patterns to manage a multi-tenant architecture. Optimized relational database performance using advanced join strategies, achieving a 60% reduction in latency across 2M+ records. • Lexity (AI / EdTech): Deployed a secure RAG-based AI platform. Achieved a Time-To-First-Token (TTFT) of <200ms and 99.9% availability for LLM execution utilizing scalable cloud infrastructure. • Interly (AI Coaching): Engineered a real-time vocal coaching platform supporting 500+ simultaneous audio streams with <300ms latency via WebRTC and modern audio streaming APIs. • Core Methodologies: Microservices, RAG/LLM Integration, Real-Time Streaming, Multi-tenant Architecture, Cloud Infrastructure, Relational & NoSQL Databases.
Software Engineer (Backend)
Itransition Group
janv. 2021 - déc. 2021
1 an
Remote, Oregon 97458, États-Unis
Developed scalable microservices for Enterprise-level applications. Key Achievements: • Scalability: Built robust backend microservices and relational database structures handling 50k+ requests per day, eliminating legacy bottlenecks. • Code Quality: Standardized code review processes with structured checklists, reducing review time by 25% and cutting post-merge bugs by 20%. • Continuous Delivery: Ensured seamless production deployments with zero downtime using modern CI/CD pipelines.
Formation
Belarusian State University of Informatics and Radioelectronics
High School Diploma, Radio, Television, and Digital Communication
2015 - 2019
4 ans 2 mois