You will get a professional Web Application, SaaS, or Landing Page from scratch
Project details
Looking for a dedicated Full-Stack Developer?
Whether you need a high-converting landing page to launch your idea or a complex, scalable web application to run your business, I am here to help. I specialize in building modern, fast, and secure web solutions using the most reliable technologies on the market.
Why work with me? I bridge the gap between stunning design and powerful logic. My focus is on writing clean, maintainable code that allows your project to grow without technical debt.
Services I provide:
Custom Web Development: From simple landing pages to complex SaaS platforms.
Frontend Excellence: Using React and Next.js for lightning-fast, SEO-optimized interfaces.
Robust Backend: Secure APIs and databases built with Node.js or Python.
Responsive Design: Your site will look and work perfectly on desktops, tablets, and smartphones.
API & Third-Party Integration: Connecting payments (Stripe/PayPal), Auth, AI models, and CRM tools.
My Core Stack:
TypeScript, JavaScript, Python, PHP.
Next.js, React, Tailwind CSS, Shadcn/UI, Node.js.
PostgreSQL, MongoDB, MySQL.
Ready to get started? Send me a message with your project details, and let's build something amazing together!
Whether you need a high-converting landing page to launch your idea or a complex, scalable web application to run your business, I am here to help. I specialize in building modern, fast, and secure web solutions using the most reliable technologies on the market.
Why work with me? I bridge the gap between stunning design and powerful logic. My focus is on writing clean, maintainable code that allows your project to grow without technical debt.
Services I provide:
Custom Web Development: From simple landing pages to complex SaaS platforms.
Frontend Excellence: Using React and Next.js for lightning-fast, SEO-optimized interfaces.
Robust Backend: Secure APIs and databases built with Node.js or Python.
Responsive Design: Your site will look and work perfectly on desktops, tablets, and smartphones.
API & Third-Party Integration: Connecting payments (Stripe/PayPal), Auth, AI models, and CRM tools.
My Core Stack:
TypeScript, JavaScript, Python, PHP.
Next.js, React, Tailwind CSS, Shadcn/UI, Node.js.
PostgreSQL, MongoDB, MySQL.
Ready to get started? Send me a message with your project details, and let's build something amazing together!
Programming Languages
HTML & CSS, Python, TypeScriptCoding Expertise
Localization, Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$800
|
Standard
$1,800
|
Advanced
$3,500
|
|---|---|---|---|
| Delivery Time | 5 days | 14 days | 14 days |
Number of Revisions | 2 | 4 | Unlimited |
Number of Pages | 3 | 7 | 11 |
Design Customization | - | - | |
Content Upload | - | - | |
Responsive Design | - | ||
Source Code |
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FR
Frank R.
Feb 14, 2025
Developer Needed to Build Custom Underwriting Portal for Loan Applications
About Serhii
Senior FullStack Engineer React/Node.js | Next.js/NestJS | AI-Native
Altena, Germany - 8:32 am local time
Hi, I am Serhii, an officially registered Freiberufler (independent contractor) based in Germany. I specialize in engineering robust web applications, startup MVPs, and complex SaaS solutions for businesses that value reliability, scalable architecture, and transparent processes.
Over the past 6+ years, I have successfully delivered multiple end-to-end projects, focusing on building systems that handle real production workloads—not just prototypes.
🔹 Workflow & Professional Standards
Local DACH Partner: Based in the Central European Timezone (CET), I provide seamless communication in English, German, and Russian. You get the legal and operational reliability of working with a Germany-based professional.
Transparent Processes: I strictly manage projects using Scrum and Jira methodologies, ensuring you have complete visibility into sprints, deliverables, and budget allocation.
AI-Native Efficiency: I leverage autonomous AI agents and modern tooling to accelerate code generation, conduct deep architectural analysis, and automate workflows, reducing your time-to-market.
Quality First: I do not compete on cheap labor; I compete on engineering excellence. My baseline for a simple landing page starts from €500, with custom SaaS platforms priced according to their architectural complexity.
🔹 Full Stack Web Development & SaaS
As a Full Stack Developer and React Node Full Stack Developer, I design comprehensive systems combining modern frontends with powerful backend services. I have extensive experience building SaaS platforms with complex billing logic (such as electronic invoicing for the German market) and AI-powered data management systems. My solutions are designed to scale, process heavy API traffic, and maintain exceptional uptime.
🔹 Frontend Development (React & Next.js)
For teams searching for a React Developer, Next.js Developer, or Frontend React Engineer: I build modern SPAs, SSR applications, and complex SaaS dashboards. Leveraging TypeScript, Next.js, and Tailwind CSS, I ensure pixel-perfect, responsive UIs. I am obsessed with frontend performance, consistently optimizing core web vitals to achieve "Perfect 100" Google Lighthouse scores.
🔹 Backend Development (Node.js/NestJS & Python)
As a Node.js Developer and Backend Engineer, I architect robust REST and GraphQL APIs using NestJS, Express, and Node.js. Furthermore, as a Python Developer, I build advanced data pipelines, backend automation, and AI integrations using Python and FastAPI.
🔹 Core Technologies & Roles I Fill:
Frontend: React Developer, Next.js Developer, Frontend Web Developer, Tailwind CSS, SPA, SSR.
Backend: Node.js Developer, NestJS, Express, Python Developer, FastAPI.
Database & Infrastructure: Prisma, PostgreSQL, MongoDB, Redis, Headless Architecture.
Methodologies: Scrum, Jira, Agile, RAG-based AI integration.
Whether you need a dedicated Frontend Engineer to perfect your UI or a Senior Full Stack Web Developer to architect your next SaaS platform from the ground up, I deliver maintainable, production-ready code.
📩 Click "Invite" or "Hire" to discuss your project architecture and business goals.
Steps for completing your project
After purchasing the project, send requirements so Serhii can start the project.
Delivery time starts when Serhii receives requirements from you.
Serhii works on your project following the steps below.
Revisions may occur after the delivery date.
Consultation & Discovery
We discuss your business goals, target audience, and technical requirements.
Planning & UI Design
I map out the application architecture and (if needed) create or review the UI/UX designs.