# Experience
> Career timeline, education, skills, and certifications — senior frontend / full-stack, TypeScript and React.
Senior Frontend Developer with over 8 years of commercial experience specialising in TypeScript, React, and full-stack web development. Proven track record of delivering high-quality, performant applications across banking, gaming, logistics, and fintech industries. Adept at leading frontend initiatives, conducting code reviews, and collaborating within cross-functional teams of up to 20 engineers. Currently expanding expertise in AI engineering — including Retrieval-Augmented Generation and Generative AI — to build intelligent, future-ready products.
## Work experience
### Senior Frontend Developer — Virtusa
2025-07-01 – 2026-03-01
Maintained and modernised a mission-critical payments platform for one of the largest banks in the United States, operating within a regulated, high-availability environment with strict security and accessibility requirements.
- Achieved 100% unit test code coverage across frontend modules, significantly reducing regression risk in production
- Delivered UX/UI improvements based on design mocks and an internal component framework, enhancing user experience consistency
- Implemented new features and translated complex business requirements into reliable, maintainable code
- Enforced OWASP security standards throughout the development lifecycle
- Resolved all WCAG 2.1 AA accessibility violations using AxeDev Tools, ensuring full regulatory compliance
- Identified and eliminated SonarCloud code smells and security hotspots, improving overall code quality metrics
- Handled production deployments and contributed to post-release monitoring and incident resolution
- Authored and maintained technical documentation for onboarding and knowledge transfer
- Developed and extended features using an internal microservices framework
### SeniorFrontend Developer | WordPress — NDA (Non-Disclosure Agreement)
2024-02-01 – 2025-06-01
Contributed to a CFO-as-a-Service fintech platform serving EU clients, supporting financial planning, cash flow management, and project profitability analysis. Responsible for both custom React application development and WordPress site maintenance.
- Developed and maintained scalable web applications for EU clients using React and no-code tooling
- Drove UX quality initiatives that resulted in user interface satisfaction exceeding 80% in internal evaluations
- Built and maintained WordPress websites, ensuring performance and content accuracy
- Delivered no-code workflow improvements that increased operational efficiency across teams
- Established and led a 3-person cross-functional team from inception, covering development, design, and project coordination roles
### SeniorFrontend Developer | React | NestJS — Woj.Tech Solutions
2023-07-01 – 2023-12-31
Designed and developed a proof-of-concept SPA for a 3D printer slicing engine, integrating a Dockerised C++ backend with a React frontend. The system was architected for horizontal scalability via Kubernetes and AWS cloud infrastructure.
- Architected and managed the full project lifecycle from technical planning through delivery
- Designed Docker configurations and established CI/CD infrastructure for the slicing microservice
- Built a React frontend connected to a NestJS backend API
- Integrated Three.js to render interactive 3D model previews and G-code visualisations, enabling side-by-side pre/post-slice comparison
- Implemented D3.js-based data visualisation dashboards for slicing summary analytics
- Applied MUI component library for consistent, responsive layout design
### Senior Fullstack Developer | Gaming & E-Sports | React | NestJS — ITMAGINATION
2022-11-01 – 2023-05-30
Served as a key contributor on a 20-person team delivering an MVP sports and e-sports betting frontend for a market with constrained mobile connectivity. Acted as the principal technical deputy to the frontend team lead.
- Functioned as the right-hand of the frontend team lead, supporting architectural decisions and sprint planning
- Delivered a visually engaging, high-performance frontend connected to an existing backend, aligned with current UX/UI standards
- Single-handedly replaced one full-time developer while achieving a measured productivity increase of over 60% in working hours
- Developed new features in Next.js using the latest React patterns and Recoil state management
- Conducted rigorous code reviews, enforcing TypeScript standards and performance best practices
- Optimised rendering performance through advanced React hooks and memoisation techniques
- Implemented pixel-perfect UI from design specifications using Tailwind CSS
- Delivered end-to-end solutions collaborating across more than two independent teams simultaneously
### Fullstack Developer | Transportation & Logistics | React | NestJS — ITMAGINATION
2020-02-01 – 2022-09-01
Member of a 10-person engineering team building a route optimisation prototype for a US-based transportation logistics company. The system dynamically maximised cargo load efficiency for multi-stop vehicle routes.
- Implemented complex features using React.js, Redux, and Redux-Observable for reactive data flows
- Translated business requirements into well-structured, type-safe TypeScript components and services
- Performed code reviews to maintain architectural consistency and code quality standards
- Optimised web application performance using advanced React hooks and rendering strategies
- Designed UI components in line with Material UI and custom SASS/CSS-in-JS design specifications
- Built Backend-for-Frontend microservices to decouple frontend data requirements from core APIs
- Scraped and normalised external data sources to enrich route planning datasets
- Configured and updated CI/CD pipelines in Kubernetes, Terraform, and Octopus Deploy
- Managed Docker container configurations for seamless CI/CD integration
- Maintained up-to-date technical documentation throughout the project lifecycle
### Frontend Developer | UX Support | R&D Electronics | Angular | Adobe XD — BFirst.Tech
2018-12-01 – 2020-02-01
Contributed to a cutting-edge R&D project leveraging machine learning to detect structural defects in steel pipes through acoustic signal analysis. The solution progressed from limited prototype accuracy to performance surpassing human expert benchmarks.
- Designed and iterated UX/UI prototypes in Adobe XD, translating complex data workflows into intuitive interfaces
- Implemented new product features and translated BDD requirements into testable frontend behaviour
- Optimised application performance to handle high-frequency acoustic data visualisation
- Conducted code reviews and enforced TypeScript quality standards across the codebase
- Managed production deployments and maintained system stability in a regulated R&D environment
- Integrated Microsoft MSAL for enterprise-grade user authentication
- Configured and managed CI/CD deployment pipelines in GitLab
- Developed advanced interactive data tagging and heatmap visualisations using Plotly.js and D3.js
- Produced comprehensive software documentation to support ongoing R&D and knowledge transfer
### IT Support Technician | A3 Migration Team — UBS (external contractor)
2017-10-01 – 2018-12-01
Engaged as an external contractor to support a large-scale hardware migration programme at UBS, transitioning legacy PC terminals to A3 thin-client workstations across the Kraków office.
- Planned and executed workstation migrations for employees, minimising business disruption
- Prepared and maintained Excel-based scheduling reports to coordinate hardware replacement across departments
- Performed hardware installation, configuration, and maintenance for migrated endpoints
### Frontend Developer | UX Support | Accounting | React — SOVA Accounting
2017-02-01 – 2017-07-01
Developed a secure, VPN-hosted ERP system for an accounting firm, built on ReactJS and Node.js. Responsible for both frontend implementation and UX design contributions.
- Architected and developed a fully functional ERP system from the ground up using React.js
- Built reusable, modular UI components aligned with an evolving design system
- Managed application state with Redux, ensuring predictable and maintainable data flows
- Specified and implemented business logic requirements in close collaboration with stakeholders
- Established code review practices and authored unit tests to ensure software reliability
- Created mock services to enable frontend development ahead of backend availability
- Produced UX/UI wireframes and interactive mockups to validate design decisions early
## Skills
### Expert
- HTML5
- CSS
- JavaScript
- TypeScript
- REST API
- JSON
- Git
- GitHub
- Test Case Design
- Agile Methodologies
- Scrum
- React.js
- Redux
### Advanced
- Material UI (MUI)
- UX Concepts & Prototyping
- Linux Server Administration
- Tailwind CSS
- AxeDevTools
- Next.js
- OAuth 2.0
- GitHub Actions
- React Hooks
- Docker
- Figma
- Adobe XD
### Intermediate
- jQuery
- Express.js
- Microservices Architecture
- Bash
- PowerShell
- Kubernetes
- Helm
- Docker Compose
- SonarCloud
- Nginx
- WCAG 2.1 AA
- Vite
- OWASP
- SSL/TLS
- Recoil
- WebSockets
- Jira
- Confluence
- Amazon Web Services (AWS)
- Shell Scripting
- CI/CD Pipelines
- Postman
- React Native
- GraphQL
- SQL
- NoSQL
- NestJS
- Node.js
- GitLab
### Basic
- Python
- Cypress
- Machine Learning
- Deep Learning
- Neural Networks
- Classification & Regression
- Predictive Modelling
- Image Recognition
- Jupyter Notebook
- TensorFlow
- Three.js
### Soft Skills
- Cross-functional Collaboration
- Analytical Problem-Solving
- Clear Technical Communication
- Time & Priority Management
- Results-Driven Mindset
- Agile / Scrum Teamwork
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Canonical: https://wojtech.solutions/en/doswiadczenie
Markdown: https://wojtech.solutions/en/doswiadczenie.md
Site: https://wojtech.solutions
Contact: kontakt@wojtech.solutions