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Maksim Maltsev

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.

About

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.

  • 7 years' experience
  • Joined October 2025

Industry experience

  • Financial Services
  • Software & Internet
  • Retail

More experts in Warsaw, Poland

Work experience· 4 roles

Lead Full Stack Engineer · WalmartSep 2023 – Present · 3 yrs 3 mos

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 · John Snow LabsAug 2023 – Oct 2025 · 2 yrs 3 mos

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 · Consumer Insights Group MarketOct 2021 – Oct 2025 · 4 yrs 1 mo

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 · Deutsche Telekom IT SolutionsSep 2019 – Oct 2025 · 6 yrs 2 mos

Education

Master’s Degree in Computer Science · ITMO University2012 – 2014
Bachelor’s Degree in Computer Science · ITMO University2008 – 2012

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