I build fast web applications using App Router, SSR, and Core Web Vitals optimization—ranging from landing pages to complex product platforms.
APP ROUTERSSR / SSGPERFORMANCESERVER COMPONENTSEDGE DEPLOYMENT
Bartosz Janiuk — Software Engineer
Engineering Digital
I transform ideas into working digital products. I design and implement front-end applications, mobile apps, and back-end integrations.
↳ ABOUT ME
BLENDING CREATIVITYAND TECHNOLOGY TO FORGE MOBILE & WEB APPS THAT RESONATE.
Bartosz Janiuk, MSc. I am an experienced programmer who creates digital experiences that leave a lasting impression. I create interactive web applications (websites) and mobile apps. I combine modern technologies with creativity to create valuable products.
I approach every project as a fusion of technology, business, and user experience. I create solutions that not only meet technical requirements but are also intuitive, aesthetically pleasing, and support business goals. I believe that the best products are created when functionality is combined with simplicity and attention to detail.
I have experience in implementing projects at various stages of development – from the first MVP to complex applications developed over the years. I collaborate with clients to help them translate their business vision into scalable and refined digital solutions.
↳ SELECTED WORK
Implementation of projects with attention to every detail.
A curated selection of product interfaces and platforms — from fitness and culinary tools to clinic experiences — focused on structure, interaction, and clarity.
Fitap – Fitness App
Umami – Dietetic Office - the company's page
Cookscale – Kitchen Tools with AI
trebacz-fizjoterapia – Company business card
Dental – Dental Equipment - Quarterly Publishing House
↳ MY EXPERIENCES
LEARN ABOUT MYPROFESSIONAL JOURNEY, COLLABORATIONS AND PROJECT ROLES
Company / OrganizationThe Software House | Gliwice, Poland
Role / PositionFrontend Developer
Year09/2023 — PRESENT
Description
- Developing and maintaining scalable web and mobile applications using React and React Native.
- Designing and implementing new product features in collaboration with international, cross-functional teams.
- Creating reusable components and shared solutions to ensure consistency across web and mobile platforms.
- Participating in architectural discussions and making technical decisions that impact application scalability and maintainability.
- Collaboration on internal practices regarding front-end quality, testing, and maintainable component architecture.
Company / OrganizationThe Software House | Gliwice, Poland
Role / PositionJunior Frontend Developer
Year04/2022 — 09/2023
Description
- Co-creating a library of reusable UI components and documenting components using Storybook.
- Implementing new front-end features based on product and design requirements.
- Creating and maintaining unit, integration, and end-to-end tests to enhance application reliability.
- Code review and collaboration with other teams to raise standards and code quality.
- I received a promotion in recognition of my contribution to the platform's redevelopment.
Company / OrganizationFreelance | Racibórz, Poland
Role / PositionFrontend Engineer
Year11/2021 — PRESENT
Description
- Designing and developing web applications for clients in the fields of dietetics, physiotherapy, and publishing.
- Building responsive, high-performance websites using Astro, Next.js, and modern front-end technologies.
- Creating interactive user experiences and animations using Framer Motion.
- Developing mobile applications using Expo and React Native.
- Implementing technical SEO improvements to enhance the website's visibility and performance in search engines.
Company / OrganizationCODELABS.ROCKS | Opole, Poland
Role / PositionFrontend Developer Intern
Year08/2021 — 10/2021
Description
- Developing and enhancing customer-facing application features using Angular and RxJS.
- Creating reusable and responsive user interface components based on provided design specifications.
- Used Reactive programming patterns to manage asynchronous data flows and user interactions.
- Collaborating with developers and designers to deliver consistent and maintainable front-end solutions.
- Active participation in daily meetings, sprint planning, code reviews, and other Agile ceremonies.
Company / OrganizationCODEFUSION | Opole, Poland
Role / PositionSoftware Developer Intern
Year09/2020 — 10/2020
Description
- Work on a Visual Studio extension that enables reading and displaying project plans (roadmaps).
- Implementing functionality using C# and the .NET framework.
- Participating in daily meetings, code reviews, and project development activities.
↳ MY TECH STACK
I WORK WITH TECHNOLOGIES THAT HELP ME CREATE AMAZING RESULTS.
I build lightweight content-driven sites using the islands architecture—minimal JavaScript, fast SSR, and flexible integration with React, Vue, or Svelte.
ISLANDS ARCHITECTURECONTENT SITESZERO JSSSR / SSGPERFORMANCE
React Native
I build mobile apps with a native feel—from prototypes to production deployments within the Expo and React Native ecosystem.
REACT NATIVEEXPOMOBILEIOSANDROIDAPP STORE READY
TypeScript
I prioritize typing from day one—secure APIs, clear contracts, and fewer regressions in growing codebases.
TYPE SAFETYSHARED TYPESSTRICT MODEAPI CONTRACTSMAINTAINABILITY
I build scalable backends within the Node.js ecosystem—REST, GraphQL, authorization, and integrations with databases and cloud services.
REST APIGRAPHQLEVENT-DRIVENAUTHDATABASESCLOUD INTEGRATIONS
I design backends in Nest.js using a modular architecture—featuring dependency injection, guards, pipes, and a predictable structure that scales from MVP to production.
NEST MODULESDEPENDENCY INJECTIONGUARDS & PIPESREST APIGRAPHQLMICROSERVICES
I implement headless CMS solutions using Sanity—covering content modeling, Sanity Studio, GROQ, and preview mode for content-driven applications.
HEADLESS CMSCONTENT MODELINGGROQSANITY STUDIOPREVIEW MODESTRUCTURED CONTENT
↳ FAQ
Frequently asked questions
↳ Contact me
Let's turn ideas into something valuable.
