Валерій

Valerii Oleksiienko
FULL-STACK DEVELOPER

[open contact info](look above in the "contact info" section) Reykjavik. Iceland https://akerman048.github.io/Portfolio/

[open contact info](look above in the "contact info" section)

S U M M A RY
Junior Fullstack Developer focused on building modern web applications with React, Next.js, TypeScript, Express, PostgreSQL and Node.js.
Built production-style backend APIs featuring JWT authentication, refresh tokens, role-based access, filtering, pagination, Swagger
documentation, and Dockerized environments.
Comfortable working across the entire development lifecycle, from database design and API development to frontend implementation and
deployment.

LANGUAGES
English Ukrainian
Upper-Intermediate
Russian
Native Proficient

Polish Spanish
Elementary
Elementary

SKILLS
Frontend: React, Next.js, State Management: Zustand, U I & S t y l i n g : Ta i l w i n d
TypeScript R e d u x To o l k i t C S S , S a s s , s h a d c n /u i
D a t a F e t c h i n g : Ta n S t a c k Q u e r y To o l s : G i t , G i t H u b , V i t e ,
Backend: Node.js, Express,
API & Authentication: REST F i r e b a s e , Po s t m a n
Postgresql
API, JWT Authentication, Documentation & DevOps:
R e f r e s h To k e n s S w a g g e r/ O p e n A P I ,
D o c k e r, D o c k e r C o m p o s e
P RO J E C T S
Portfolio Website GitHub Task Manager API API Docs GitHub
• Built portfolio website with custom CMS using • Built a RESTful task management API with JWT
Firebase (Firestore, Auth, Hosting) authentication
• Developed dynamic theming system (colors, fonts, • Implemented CRUD operations, filtering, search,
styles) configurable from UI sorting, and pagination
• Designed responsive layout and optimized • D o c u m e n t e d e n d p o i n t s w i t h S w a g g e r/ O p e n A P I a n d
performance with caching strategies containerized the application with Docker

Te c h : R e a c t , F i r e b a s e , Ta i l w i n d C S S Te c h : N o d e . j s , E x p r e s s . j s , Po s t g r e S Q L , J W T,
S w a g g e r/ O p e n A P I , D o c k e r

Cinema Booking App (Multiplex Clone) GitHub VIN Decoder App GitHub

• Built full-featured booking flow (seat selection, • B u i l t V I N d e c o d i n g t o o l u s i n g R e a c t , Ty p e S c r i p t ,
cart , validation) and Vite
• Developed dynamic movie pages with schedules • Integrated NHTSA API to fetch and display vehicle
and trailers data
• Implemented complex UI interactions and state • I m p l e m e n t e d V I N v a l i d a t i o n ( 17 c h a r a c t e r s ,
management restricted symbols)
• Stored recent searches using localStorage
Te c h : R e a c t , Ty p e S c r i p t , F i r e b a s e • Designed responsive UI with clear data
presentation

Photographer Portfolio CMS GitHub Finance backend API API Docs GitHub

• Built admin panel for real-time content editing (no- • Built a RESTful finance management API with JWT
code updates) authentication
• Implemented dynamic theming (fonts, colors, • Implemented transaction CRUD operations,
layout) filtering, search, sorting, and pagination
• Created interactive UI (sliders, animations, mouse • Developed financial summary and analytics
effects) endpoints
• D o c u m e n t e d e n d p o i n t s w i t h S w a g g e r/ O p e n A P I a n d
Te c h : R e a c t , F i r e b a s e containerized the application with Docker
EXPERIENCE
Frontend Developer (Freelance & Personal Projects)
2026 – PRESENT | REYKJAVIK, ICELAND

Developed 5+ web applications using React, Next.js, and TypeScript, focusing on performance and scalability
Built reusable UI components and design systems with Tailwind CSS
Integrated Firebase (Auth, Firestore, Hosting) for real-time data and user authentication
Improved application performance through code splitting and optimized rendering
Managed version control and collaboration using Git/GitHub
Delivered projects for multiple clients, including landing pages and dynamic web apps

Frontend Developer
ÖLGERÐIN | 2023 – 2026 | REYKJAVIK, ICELAND

Developed responsive and reusable UI components (modals, forms, sliders, cards)
Built interactive features using React (hooks, state management, component architecture)
Integrated REST APIs using fetch/axios to handle dynamic data and user interactions
Implemented adaptive layouts using HTML5, CSS3, Flexbox, and Grid
Configured client-side routing with React Router
Applied modern styling approaches (CSS Modules, Styled Components, Tailwind CSS)

Marketing Assistant / Frontend Developer
TANITA-ROMARIO | 2021 – 2022 | ODESA, UKRAINE

Built responsive landing pages from Figma designs using HTML5, CSS3 (Flexbox, Grid)
Developed interactive features with JavaScript (ES6) for forms and user interactions
Managed and optimized Facebook Ads & Google Ads campaigns with monthly budgets of $10,000–$20,000
Created analytics dashboards to track performance (ROI, conversions, traffic)
Collaborated with designers and developers to launch high-performing landing pages
Increased online sales revenue by 4x during tenure

Media Buyer / Frontend Developer
ACIDBRO | 2020 – 2021 | ODESA, UKRAINE

Developed landing pages and UI components (buttons, sliders, navigation)
Built responsive layouts from Figma using HTML5, CSS3 (Flexbox, Grid)
Conducted A/B testing to optimize conversion rates and campaign performance
Managed advertising campaigns across Unity Ads, Google Ads, and Facebook Ads (budgets up to $10,000)
Created and tested creatives (images, videos) for international markets
Scaled campaigns and achieved ROI up to 600%

EDUCATION

Bachelor's Degree in Business Administration
ODESA I.I. MECHNIKOV NATIONAL UNIVERSITY

2010 - 2014