Aleksander I.
Senior Full Stack Engineer
Experience
Jun 2022 - Oct 2025
3 years 5 monthsFrance
Senior Full Stack Engineer
Devoteam France
- Architected real-time collaboration platforms using React, Next.js, TypeScript, WebSockets, and Y.js, enabling 200+ concurrent users with live state synchronization.
- Designed microservices in Java, .NET Core, and Python for multi-tenant content management and scalable REST/GraphQL APIs.
- Engineered a media-processing pipeline on AWS (Lambda, CloudFront, FFmpeg, S3), improving throughput by 60% and reliability across 500K+ assets weekly.
- Deployed Kubernetes-based infrastructure with auto-scaling, service discovery, and CI/CD using Terraform and GitHub Actions.
- Integrated real-time analytics pipelines via Kafka, Segment, and Amplitude, boosting campaign insights by 20%.
- Developed serverless backend modules using Node.js and FastAPI, reducing latency and operational cost.
- Implemented end-to-end testing automation (Cypress, Playwright, Selenium) for continuous deployment validation.
- Led and mentored a team of 6 engineers, establishing standards for code quality, DevOps workflows, and security policies (SonarQube, GuardDuty).
- Partnered with design and DevOps teams to deliver cross-platform solutions with optimized React UIs and robust API integrations.
Jun 2019 - Apr 2022
2 years 11 monthsPoland
Full Stack Engineer
Netguru Poland
- Built scalable frontends in React, Next.js, and TypeScript integrated with Node.js and NestJS APIs, achieving 60% performance improvements.
- Designed and maintained RESTful and GraphQL APIs for real-time design collaboration, caching, and user management.
- Implemented microservices architecture with Docker and Kubernetes, ensuring modular deployment and rapid scaling.
- Developed data visualization and analytics dashboards using D3.js and React, improving design team productivity by 35%.
- Automated CI/CD pipelines (GitHub Actions, CircleCI) to deploy front and backend seamlessly across environments.
- Introduced testing frameworks (Cypress, Playwright, Jest) ensuring regression-free releases.
- Collaborated with UX teams using Figma and Storybook to achieve pixel-perfect, responsive interfaces.
- Optimized API performance through Redis caching and database indexing (PostgreSQL, MongoDB).
- Mentored developers and introduced coding standards, reducing bugs by 40% and onboarding time by 30%.
Sep 2017 - May 2019
1 year 9 monthsPoland
Backend Engineer
Merixstudio Poland
- Built HIPAA-compliant telehealth backends in Node.js, Python, and Express with encrypted data handling.
- Integrated Twilio WebRTC video and WebSocket messaging, supporting over 10,000 secure sessions yearly.
- Created role-based authentication (OAuth2, JWT) systems ensuring GDPR and healthcare compliance.
- Designed serverless analytics using AWS Lambda and DynamoDB, enabling instant reporting and real-time tracking.
- Developed admin portals and HR automation systems, reducing manual effort by 45%.
- Enhanced backend scalability using Docker and Kubernetes with 99.95% uptime.
- Established monitoring pipelines via CloudWatch and Elastic Stack, ensuring fast issue resolution.
- Implemented CI/CD pipelines (Jenkins, GitHub Actions) for automated deployment and testing.
- Collaborated with frontend teams (React, Angular) to build consistent, data-driven experiences.
Summary
Senior Full Stack Engineerwith 8+ years of experience designing and scaling high-performance web and cloud platforms across SaaS, real-time collaboration, and healthcare industries. Skilled in modern frontend frameworks (React, Next.js, TypeScript) and backend technologies (Node.js, Java, Python), with a strong foundation in microservices, DevOps automation, and cloud architecture on AWS and Azure. Proven track record in leading engineering teams, optimizing system reliability, and delivering robust, scalable software solutions.
Languages
English
AdvancedEducation
Sep 2012 - Aug 2017
DSW University of Lower Silesia
Bachelor of Science · Computer Applications · Poland
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