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I'm Maksim Maltsev, a Full Stack Developer based in Warsaw, Poland. I design scalable fintech and eCommerce platforms, focusing on secure payment APIs, fraud detection, and cloud-native architecture. I work with Java (Spring Boot) and React, building robust microservices and high-performance APIs while embracing DevSecOps and reliable CI/CD pipelines. Over 10+ years, I've led cross-functional teams, delivered full-stack analytics dashboards for enterprise fintech clients across Europe, and improved API reliability and latency. I love turning complex financial workflows into intuitive digital experiences, and I enjoy optimizing systems for scale, security, and uptime.…I'm Maksim Maltsev, a Full Stack Developer based in Warsaw, Poland. I design scalable fintech and eCommerce platforms, focusing on secure payment APIs, fraud detection, and cloud-native architecture. I work with Java (Spring Boot) and React, building robust microservices and high-performance APIs while embracing DevSecOps and reliable CI/CD pipelines. Over 10+ years, I've led cross-functional teams, delivered full-stack analytics dashboards for enterprise fintech clients across Europe, and improved API reliability and latency. I love turning complex financial workflows into intuitive digital experiences, and I enjoy optimizing systems for scale, security, and uptime.

Maksim Maltsev

Full Stack Developer, Web Developer, Back-End Developer, +2

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I'm Maksim Maltsev, a Full Stack Developer based in Warsaw, Poland. I design scalable fintech and eCommerce platforms, focusing on secure payment APIs, fraud detection, and cloud-native architecture. I work with Java (Spring Boot) and React, building robust microservices and high-performance APIs while embracing DevSecOps and reliable CI/CD pipelines. Over 10+ years, I've led cross-functional teams, delivered full-stack analytics dashboards for enterprise fintech clients across Europe, and improved API reliability and latency. I love turning complex financial workflows into intuitive digital experiences, and I enjoy optimizing systems for scale, security, and uptime.…I'm Maksim Maltsev, a Full Stack Developer based in Warsaw, Poland. I design scalable fintech and eCommerce platforms, focusing on secure payment APIs, fraud detection, and cloud-native architecture. I work with Java (Spring Boot) and React, building robust microservices and high-performance APIs while embracing DevSecOps and reliable CI/CD pipelines. Over 10+ years, I've led cross-functional teams, delivered full-stack analytics dashboards for enterprise fintech clients across Europe, and improved API reliability and latency. I love turning complex financial workflows into intuitive digital experiences, and I enjoy optimizing systems for scale, security, and uptime.

Available to hire

I’m Maksim Maltsev, a Full Stack Developer based in Warsaw, Poland. I design scalable fintech and eCommerce platforms, focusing on secure payment APIs, fraud detection, and cloud-native architecture. I work with Java (Spring Boot) and React, building robust microservices and high-performance APIs while embracing DevSecOps and reliable CI/CD pipelines.

Over 10+ years, I’ve led cross-functional teams, delivered full-stack analytics dashboards for enterprise fintech clients across Europe, and improved API reliability and latency. I love turning complex financial workflows into intuitive digital experiences, and I enjoy optimizing systems for scale, security, and uptime.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Work Experience

Lead Full Stack Engineer at Walmart

September 1, 2023 - Present

Architected and developed React + Spring Boot microservices for global payments and fraud-prevention workflows. Built responsive dashboards for transaction monitoring and analytics using React, TypeScript, and Chart.js. Enhanced PostgreSQL and API performance, ensuring sub-100ms response time for critical endpoints. Deployed backend services on GCP Kubernetes with observability via Prometheus and Grafana. Led code quality initiatives with full-stack testing (Jest + JUnit) and CI/CD automation.

Full Stack Engineer at John Snow Labs

August 1, 2023 - October 25, 2025

Implemented real-time financial APIs using Java and Redis Streams, with React-based monitoring interfaces. Integrated asynchronous messaging for secure transactions and reduced system latency. Automated deployments through Jenkins and GitHub Actions for both backend and frontend services. Collaborated cross-functionally to build fraud detection dashboards and reporting systems.

Chief Technology Officer at Consumer Insights Group Market

October 1, 2021 - October 25, 2025

Directed migration from monolith to microservices architecture using Spring Boot and React. Deployed Kubernetes clusters on GCP for scaling enterprise analytics solutions. Oversaw UX/UI redesign for financial analytics portals, improving client engagement by 30%. Implemented observability and performance monitoring stack using Grafana, Prometheus, and NewRelic.

Software Engineer at Deutsche Telekom IT Solutions

September 1, 2019 - October 25, 2025

Developed scalable APIs and React-based dashboards for telecom management tools. Optimized query performance by 50% through Redis caching and database tuning. Maintained CI/CD pipelines ensuring continuous deployment across multi-region systems.