Aleksander I.-Senior Full Stack Engineer
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Experience
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.
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%.
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.
Industry experience
See where this freelancer has spent most of their professional time.
Experienced in Information Technology and Healthcare.
Business area experience
See which departments and functions this freelancer has contributed to most.
Experienced in Information Technology, Product Development, and Quality Assurance.
Summary
Senior Full Stack Engineer with 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.
Skills
- Frontend: React, Next.Js, Angular, Vue.Js, Typescript, Tailwind Css, Material Ui, Redux, Zustand, D3.Js, Storybook, Figma
- Backend: Java, Spring Boot, .Net Core, Node.Js, Express, Nestjs, Python, Django, Fastapi, Go, Php, Laravel
- Architecture & Apis: Rest, Graphql, Microservices, Serverless, Event-Driven Systems, Oauth2, Jwt, Kafka, Rabbitmq
- Devops & Cloud: Aws (Lambda, Ecs, Cloudfront, Ec2, Rds), Azure, Docker, Kubernetes, Terraform, Github Actions, Jenkins
- Databases: Postgresql, Mysql, Mongodb, Redis, Dynamodb
- Testing & Ci/Cd: Cypress, Playwright, Selenium, Tdd, Github Actions, Circleci
Languages
Education
DSW University of Lower Silesia
Bachelor of Science in Computer Applications · Computer Applications · Wrocław, Poland
Statistics
Experience
Expertise
Qualifications
Profile
Frequently asked questions
Have questions? Find more information here.
Aleksander is based in Płock, Poland.
Aleksander speaks the following languages: English (Advanced), Polish (Advanced).
Aleksander has at least 8 years of experience. During this time, Aleksander has worked in at least 3 different roles and for 3 different companies. The average length of individual experience is 3 years and 8 months. Note that Aleksander may not have shared all experience and actually has more experience.
Based on recent experience, Aleksander would be well-suited for roles such as: Senior Full Stack Engineer, Full Stack Engineer, Backend Engineer.
Aleksander's most recent position is Senior Full Stack Engineer at Devoteam France.
In recent years, Aleksander has worked for Devoteam France and Netguru Poland.
Aleksander is most experienced in industries like Information Technology and Healthcare.
Aleksander is most experienced in business areas like Information Technology, Product Development, and Quality Assurance.
Aleksander has recently worked in industries like Information Technology.
Aleksander has recently worked in business areas like Information Technology, Product Development, and Quality Assurance.
Aleksander holds a Bachelor in Computer Applications from DSW University of Lower Silesia.
The availability of Aleksander needs to be confirmed.
Daily rate distribution
The rates shown represent the typical market range for freelancers in this position based on recent contracts on our platform.
Average rates for similar positions
Rates are based on recent contracts and do not include FRATCH margin.
The average daily rate is the mean of all daily rates from recent contracts of comparable freelancers on our platform.
The median daily rate is the middle value of all daily rates — half of comparable freelancers charge less, half charge more. Unlike the average, it is barely affected by outliers.
Calculated based on our freelancers’ daily rates as of 7 Sep 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
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