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JavaScript Node.js React.js Software Development Typescript
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Oleksandr F.

@oleksandrf3

5.0
2

2.7

2.7

100%

⭐️Engineer of Smart Systems | MERN, .NET, Python⭐️

$39 USD / Hour

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Czech Republic (1:46 AM)

Joined on October 30, 2025

$39 USD / Hour

I design and ship systems that think, talk, and scale customer-facing apps, internal dashboards, and AI-powered workflows that remove manual work and unlock growth. What you get: - Clear dashboards and auditable processes - Stable, secure and maintainable builds your team can own - Fewer clicks, fewer errors, faster response times Stack and superpowers: - Frontend: React, Nextjs, typescript, Vue, Angular - Mobile: React Native, Flutter - Backend: Nodejs, Express, Nestjs, C#/.NET Core/ASP.NET MVC - Data: PostgreSQL, mongoDB, Sql server with Prisma or Entity Framework - Automation: [login to view URL], N8N, Zapier, GoHighLevel (GHL) - AI: GPT-4 via OpenAI API for chatbots, content and decisionn flows - Scripting/Logic: Python for data processing and API orchestration - Integrations: Landbot, Twillio, Slack, Discord, Notion, Airtable, Google Sheets Signature solutions: - AI support assistants and lead funnels that qualify, route and follow up 24/7 - Internal control panels for ops, billing, and analytics (React/Next + Node/Next or .NET) - Event-driven automations that stitch tools together (n8n/Make/Zapier + Python + GPT-4) How we'll work 1. Blueprint: a focused plan with data flows, success metrics, and scope 2. Build: iterative delivery with demo checkpoints 3. Launch: docs, handover, and observability for smooth scaling New to Freelancer, not new to shipping

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5.0 · 2 Reviews
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Desenvolvedor React native + Typescript €195 EUR

Oleksandr did great work on this high priority project, his high availability and skillset in React Native made this project with an extremely short deadline possible. [20 November, 2025] Oleksandr did great work on this React Native project which had a very short deadline. Communication and promptness in responded helped immensely in getting this done on time

Luiz R.

@PereiraR

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Lisbon, Portugal

2 days ago

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Experience

Sr.Software Engineer

Feb, 2022 - Aug, 2025

3 years, 6 months

Key Development

Feb, 2022 - Aug, 2025

3 years, 6 months

- Spearheaded the architecture and delivery of end-to-end full stack solutions, overseeing both frontend and backend layers in the context of Key Developments's product offerings. - Designed and built robust RESTful APIs and microservices using nodejs, .NET to support high scale web and mobile applications for clients in e-commerce, enterprise software and Saasdomains. - Established and maintained CI/CD pipelines, containerised deployments (Docker, Kubernetes), cloud infrastructure (AWS/Azure)

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Sofia, Bulgaria

Feb, 2022 - Aug, 2025

3 years, 6 months

Sr.Full stack developer

Sep, 2019 - Apr, 2021

1 year, 7 months

Onectus technologies

Sep, 2019 - Apr, 2021

1 year, 7 months

- Delivered full stack solutions from frontend through to backend for e-commerce, Saas and marketplace products, aligning with Onectus's business focus on MVPs & custom web platforms. - Built fronted using moder frameworks like React, Vue, Angular with tyupescript while developing backend using nodejs, .NET core, python - Participated in agile development cycles; sprint planning, backlog grooming, code reviews, pair programming, and mentoring junior developers where applicable.

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Kaunas, Lithuania

Sep, 2019 - Apr, 2021

1 year, 7 months

Full Stack Developer

Feb, 2016 - Jun, 2019

3 years, 4 months

Siesta Labs

Feb, 2016 - Jun, 2019

3 years, 4 months

- Spearheaded the development of end-to-end digital solutions: designed and implemented both client-facing web apps and server-side services, aligning with Siesta Labs' mission to turn "complexity into elegantly scalable solutions" - Contributed to performance optimisation, maintainability improvements and technical debt reduction; for example improved appolication load times, refactored legacy code, and introduced automated testing to reduce bug count and speed up release cycles.

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Prague, Czech Republic

Feb, 2016 - Jun, 2019

3 years, 4 months

Education

Czech Technical University in Prague

2005 - 2009

4 years

Bachelor's degree, Computer Science

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Czech Republic

2005 - 2009

4 years

Registered Users

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