You will get a Marketplace platform logic
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Project details
Are you building a marketplace and need solid backend logic instead of just basic listings? 🛒
Whether launching a two-sided marketplace or upgrading an existing platform, I build backend systems designed for real transactions and long-term scale.
Message me before placing an order to align on your marketplace model and revenue structure.
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Whether launching a two-sided marketplace or upgrading an existing platform, I build backend systems designed for real transactions and long-term scale.
Message me before placing an order to align on your marketplace model and revenue structure.
Buzz: marketplace platform logic, marketplace backend logic design, marketplace platform backend architecture, marketplace system logic design, two sided marketplace platform logic, marketplace transaction logic design, marketplace platform backend system, marketplace platform architecture design, marketplace backend workflow logic, marketplace platform logic expert, marketplace platform logic service, marketplace platform system design, marketplace backend infrastructure design, marketplace platform logic for saas, marketplace payment logic architecture, marketplace platform data logic design, scalable marketplace platform logic, marketplace backend logic consulting, marketplace platform engineering design, professional marketplace platform logic
Programming Languages
JavaScript, Python, TypeScriptCoding Expertise
Localization, Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$50
|
Standard
$100
|
Advanced
$200
|
|---|---|---|---|
| Delivery Time | 14 days | 30 days | 60 days |
Number of Revisions | 0 | 1 | 2 |
Number of Pages | 5 | 5 | 5 |
Design Customization | - | - | |
Content Upload | |||
Responsive Design | |||
Source Code | - |
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AR
Alexander R.
Mar 13, 2026
AI developer/team with React Native and Python experience for the Babycare/Wellness APP
Denys worked on our Mobile Application as a Full Stack developer using React Native and Python. He helped with mobile features, backend logic, and AI-related functionality. Communication was clear, tasks were delivered on time, and he focused on practical solutions that improved app stability and performance. It was a pleasure working with Denys.
About Denys
Full Stack Developer | Mobile App Development | SaaS Developer
100%
Job Success
Odesa, Ukraine - 11:27 pm local time
I'm a Full Stack Developer, Mobile App Developer, and Backend Developer focused on production-ready software that holds up under real-world usage. My work sits at the intersection of Software Developer, Senior Web Developer, and SaaS Development specialist, with a backend-first mindset and deep attention to scalability and maintainability - from React Native and Flutter on mobile to Python, Node.js, and Laravel on the backend. As a Full Stack Developer and Backend Developer, I own every layer, from React components to AWS architecture.
Core Specializations
Full Stack Web & API Development
As a Web Developer and React Developer comfortable across the entire stack, I build end-to-end solutions using React, Vue, Next.js, and TypeScript on the frontend, paired with Python (FastAPI, Django, Flask), Node.js, and Laravel on the backend. As a Front End Developer handling Web Design and component architecture, while I have previously worked as a Wordpress developer, my current focus is on custom SaaS Development and API-driven systems. As a Full Stack Developer, I own delivery from database schema to deployed product.
Scalable Backend Architecture
As a Python Developer and Node.js specialist, I build robust APIs for high concurrency - including SaaS Developer products that require multi-tenant architecture and subscription logic. As a Backend Developer, I focus on stable systems - REST or GraphQL - that handle complex business logic without performance degradation. As a DevOps-minded Full Stack Developer, I manage deployment pipelines and infrastructure as code across AWS and Microsoft Azure environments.
Performance Optimization & Systems Recovery
As a Full Stack Developer specializing in Mobile App Developer work, I resolve critical bottlenecks across mobile and web - reducing React Native app startup times, fixing memory leaks in Flutter apps, and resolving crashes in Swift and Kotlin codebases. Whether working as an Android Developer or iOS Developer, this is where my depth as a Mobile App Developer makes a difference in retention.
AI-Integrated Mobile App Developer Work
As a Full Stack Developer focused on Mobile App Developer work, I deliver intelligent cross-platform mobile apps as a React Native Developer and Flutter Developer, with native experience in Swift and Kotlin. I integrate OpenAI API, LangChain, and RAG systems for AI and API Integration that feels native and responsive on both iOS and Android, covering the full lifecycle from design and testing to App Store and Play Store deployment.
Data & Cloud Infrastructure
As a Full Stack Developer and AWS Architect, I bring deep expertise in AWS (Lambda, S3, DynamoDB), Microsoft Azure, PostgreSQL, and Redis. As a DevOps-focused engineer, I protect sensitive user data across Web, Android, and iOS platforms.
When projects require AI-powered functionality, I bring hands-on experience integrating AI into backend and mobile systems alike. This allows me, as a SaaS Developer, to deliver AI Integration that is reliable, observable, and cost-controlled rather than experimental.
Clients typically work with me when they need:
- a Full Stack Developer who can own frontend and backend
- a Mobile App Developer with React Native, Flutter, and native iOS/Android experience
- a Senior Web Developer or Backend Developer experienced with real production systems
- AI Integration and API Integration for existing or new platforms
- a SaaS Developer who understands long-term scalability constraints
- AWS Architect or Azure-based cloud infrastructure
- MVPs that can realistically evolve into long-term SaaS Development products
Technical Expertise
- Mobile: React Native, Flutter, Swift, Kotlin, TypeScript, Redux Toolkit, React Query
- Frontend: React, Vue, Next.js, TypeScript, Tailwind CSS
- Backend: Python (FastAPI, Django, Flask), Node.js, Laravel, PHP, REST & GraphQL
- AI & Automation: OpenAI API, LangChain, Vector Databases, RAG, AI Machine Learning
- Data & Cloud: AWS (S3, Lambda, DynamoDB), Microsoft Azure, PostgreSQL, Redis
- Tools: Docker, CI/CD, Git, Stripe, DevOps pipelines
Professional Approach
Having worked across Wellness, Fintech, Healthcare, and SaaS Development as a Full Stack Developer and Mobile App Developer, I provide architecture that scales, transparent communication, and end-to-end delivery from database schema to cloud deployment on AWS and Azure.
I do not take on Wordpress developer projects, SaaS marketing, Google Ads, or Digital Marketing services.
If you need a Full Stack Developer or Mobile App Developer to own the roadmap from MVP to production scale - let us discuss your project on Upwork.
Steps for completing your project
After purchasing the project, send requirements so Denys can start the project.
Delivery time starts when Denys receives requirements from you.
Denys works on your project following the steps below.
Revisions may occur after the delivery date.
Discovery & Requirements Review
Client shares project details, goals, scope, and any existing materials. I review everything and align on expectations, timeline, and deliverables.
Review & Revisions
Client reviews the work. I apply agreed revisions and fine-tune the final output.