You will get Senior Full-Stack FinTech & Marketplace Developer | React / Node.js / API
Project details
I build secure, production-ready FinTech and marketplace platforms with React / Next.js frontends, Node.js backends, and API-driven integrations. My work focuses on payment systems, SaaS marketplaces, and multi-tenant applications, ensuring scalability, reliability, and clean architecture.
Whether you need a MVP, full production platform, or system refactor, I deliver end-to-end solutions, including role-based access, secure payment gateways (Stripe, Adyen, PayPal), webhook automation, dashboards, and multi-tenant features.
Every project includes production deployment, monitoring, testing, and documentation, ensuring your marketplace or FinTech system works reliably under real-world usage. I specialize in building systems that scale, handle high API loads, and provide long-term stability for your business.
Whether you need a MVP, full production platform, or system refactor, I deliver end-to-end solutions, including role-based access, secure payment gateways (Stripe, Adyen, PayPal), webhook automation, dashboards, and multi-tenant features.
Every project includes production deployment, monitoring, testing, and documentation, ensuring your marketplace or FinTech system works reliably under real-world usage. I specialize in building systems that scale, handle high API loads, and provide long-term stability for your business.
Programming Languages
HTML & CSS, JavaScript, TypeScriptCoding Expertise
Cross Browser & Device Compatibility, Performance Optimization, DesignWhat's included
| Service Tiers |
Starter
$399
|
Standard
$849
|
Advanced
$1,599
|
|---|---|---|---|
| Delivery Time | 4 days | 12 days | 24 days |
Number of Revisions | 1 | 1 | 1 |
Number of Pages | 1 | 5 | 10 |
Design Customization | - | ||
Content Upload | - | ||
Responsive Design | |||
Source Code |
Frequently asked questions
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ME
Mohammed Amir E.
Dec 23, 2024
Refinement of Existing Software
Great working with Asif, was able to to do a fantastic job and provided me with everything I needed doing. Would highly recommend!
WD
Wilzer D.
Jun 8, 2023
Deployment and Accounts Creation
JG
John G.
Jan 25, 2023
Trip Trader Phase 4
Asif and his team have yet to let me down. I am so thankful that I am able to work with a full stack dev as professional and patient as Asif.
MK
Moiz K.
Jan 25, 2023
Build responsive webapp
Asif and his team were absolutely amazing at conceptualizing the webapp needs and creating a framework for analysis and review. They made revisions as discussed and produced an overly exceptional end-product. Highly recommended!
CT
Chroma Tech T.
Jan 20, 2023
ERD Diagram of the tables being used
About Asif
Senior Full-Stack Developer | React / Next.js / Node.js | SaaS & AI
100%
Job Success
Gujrat, Pakistan - 1:15 pm local time
𝟖+ 𝐲𝐞𝐚𝐫𝐬 𝐛𝐮𝐢𝐥𝐝𝐢𝐧𝐠 𝐩𝐫𝐨𝐝𝐮𝐜𝐭𝐢𝐨𝐧 𝐬𝐲𝐬𝐭𝐞𝐦𝐬 • 𝐀𝐫𝐜𝐡𝐢𝐭𝐞𝐜𝐭𝐮𝐫𝐞 • 𝐒𝐜𝐚𝐥𝐚𝐛𝐢𝐥𝐢𝐭𝐲 • 𝐑𝐞𝐥𝐢𝐚𝐛𝐢𝐥𝐢𝐭𝐲
I help startups and product teams design, refactor, and scale real SaaS platforms not prototypes, but systems that must work reliably in production.
Most of my work involves stepping into existing codebases, improving architecture, integrating complex APIs, and shipping features that scale under real-world usage.
🕰️ Available across US / Canada / UK overlapping hours
🏆Top Rated • 100+ successful builds • Long-term engineering partner
𝐖𝐡𝐚𝐭 𝐈 𝐁𝐮𝐢𝐥𝐝
I help startups and growing teams design, refactor, and scale production-ready SaaS platforms.
Most of my work involves improving existing systems, stabilizing architecture, integrating complex APIs, and shipping features that must work reliably in real production environments.
I specialize in systems where scalability, reliability, and clean architecture are non-negotiable.
𝐄𝐱𝐩𝐞𝐫𝐭𝐢𝐬𝐞 & 𝐔𝐬𝐞 𝐂𝐚𝐬𝐞𝐬
✔️ Production SaaS & multi-tenant platforms
✔️ Refactoring legacy systems & removing technical debt
✔️ AI-powered features & LLM integrations
✔️ API-driven products & third-party integrations
✔️ Stripe payments & subscription systems
✔️ Webhook architectures & automation workflows
✔️ Dashboards, internal tools & complex data interfaces
✔️ Performance optimization & scalability upgrades
✔️ Startup systems preparing for growth
𝐅𝐫𝐨𝐧𝐭𝐞𝐧𝐝 (Architecture-Focused)
✔️ React.js / Next.js / Advanced TypeScript
✔️ Scalable frontend architecture & folder structure
✔️ SSR / SSG / performance optimization
✔️ Component systems & maintainable UI architecture
✔️ Responsive, accessible, production UI
✔️ State management & data-heavy dashboards
𝐁𝐚𝐜𝐤𝐞𝐧𝐝 & 𝐀𝐏𝐈 𝐄𝐧𝐠𝐢𝐧𝐞𝐞𝐫𝐢𝐧𝐠
✔️ Node.js / TypeScript backend architecture
✔️ REST APIs & integration frameworks
✔️ Authentication, OAuth & role systems
✔️ Async processing, background jobs & queues
✔️ Webhook systems with idempotency & fault tolerance
✔️ Reliability engineering & error handling
✔️ API scalability & performance tuning
(Light experience with Python & .NET ecosystems when needed.)
𝐃𝐚𝐭𝐚 & 𝐈𝐧𝐟𝐫𝐚𝐬𝐭𝐫𝐮𝐜𝐭𝐮𝐫𝐞
✔️ PostgreSQL / MongoDB
✔️ AWS production deployments
✔️ Supabase & modern backend platforms
✔️ Cloud architecture & scaling strategies
✔️ CI/CD & production workflows
✔️ Monitoring, logging & observability
𝐀𝐈 & 𝐌𝐨𝐝𝐞𝐫𝐧 𝐒𝐲𝐬𝐭𝐞𝐦𝐬
✔️ OpenAI / Claude / LLM integrations
✔️ AI workflows inside production apps
✔️ Agentic automation systems
✔️ Intelligent SaaS features
𝐖𝐡𝐚𝐭 𝐘𝐨𝐮 𝐆𝐞𝐭
✔️ Clean, maintainable production code
✔️ Architecture decisions that scale
✔️ Systems built for reliability, not hacks
✔️ Strong documentation & predictable delivery
✔️ A senior engineer who owns outcomes
𝐖𝐨𝐫𝐤𝐢𝐧𝐠 𝐒𝐭𝐲𝐥𝐞
✔️ Ownership mindset
✔️ Clear communication
✔️ Independent execution
✔️ Comfortable inside existing codebases
✔️ Focused on long-term stability
With 𝟖+ 𝐲𝐞𝐚𝐫𝐬 𝐛𝐮𝐢𝐥𝐝𝐢𝐧𝐠 𝐚𝐧𝐝 𝐬𝐭𝐚𝐛𝐢𝐥𝐢𝐳𝐢𝐧𝐠 𝐫𝐞𝐚𝐥 𝐒𝐚𝐚𝐒 𝐩𝐫𝐨𝐝𝐮𝐜𝐭𝐬, I help teams ship confidently, scale safely, and turn fragile systems into production-grade platforms.
If you need a senior engineer who can step into a live system, understand it fast, and improve it without breaking what already works
𝐋𝐞𝐭'𝐬 𝐛𝐮𝐢𝐥𝐝 𝐬𝐨𝐦𝐞𝐭𝐡𝐢𝐧𝐠 𝐬𝐨𝐥𝐢𝐝. 🚀
Steps for completing your project
After purchasing the project, send requirements so Asif can start the project.
Delivery time starts when Asif receives requirements from you.
Asif works on your project following the steps below.
Revisions may occur after the delivery date.
Analyze project requirements and payment workflow
Design secure, scalable architecture for React / Next.js frontend and Node.js backend
Implement payment integrations and transaction flows
Build multi-tenant, role-based marketplace or SaaS modules