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Fiverr Pro
English
$
USD
I will develop a high performance backend architecture and API integrations
Allex
5.0
5.0
About this gig
Looking for a backend that doesn't just work, but scales?
With over 20 years of experience in high-stakes environments and complex system management, I don't just "write code." I build robust, secure, and mission-critical architectures designed to solve real business problems.
Whether you are launching an MVP or scaling an enterprise-grade application, I provide professional backend development focused on performance, clean code, and seamless integrations.
What I can do for you:
- Custom API Development: RESTful services using Node.js, Python, or Firebase.
- Database Design: Optimized SQL/NoSQL architectures (PostgreSQL, MongoDB, Firestore).
- Complex Automations: Advanced workflows using n8n to connect your entire ecosystem.
- Third-Party Integrations: Payment gateways (Stripe/PayPal), WhatsApp APIs, CRM, and Cloud Services.
- Cloud & DevOps: Dockerized environments and CI/CD pipelines for automated deployment.
Why choose my service?
- Strategic Vision: I understand the logic behind the business, ensuring the tech supports your goals.
- Security First: Implementation of JWT, OAuth, and data protection best practices.
- Clean & Scalable Code: Easy to maintain and ready for future growth.
- Clear Com
Get to know Allex
Allex
Pro optimizer
- FromBrazil
- Member sinceSep 2025
- Avg. response time2 hours
- Last delivery3 months
Languages
English, Portuguese, Spanish
n8n Automation Expert | AI Agents & Business Logic Specialist
Leverage my 20 years of expertise to transform your data. I build strategic spreadsheets with smart formulas and dynamic dashboards that not only streamline your work but also deliver the high-quality, impressive results your boss is looking for. Efficiency guaranteed.
Other Software Development Services I Offer
Reviews
2 reviews for this Gig
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Rating Breakdown
- Seller communication level
- Quality of delivery
- Value of delivery
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R rodrigobsb2001
Brazil
Ongoing collaborationExcellent service! Allex was very professional, attentive, and delivered high-quality work. Communication was clear throughout the process, and the final result met my expectations very well. I highly recommend his services and would definitely work with him again.
$50-$100
Price
13 days
Duration
M 
Seller's Response
Helpful?R rodrigobsb2001
Brazil
Ongoing collaborationAllex did a great job and delivered exactly what I needed. He was professional, responsive, and paid close attention to detail throughout the project. Communication was smooth, the work was delivered on time, and the final result matched my expectations. I would definitely recommend him and work with him again.
$50-$100
Price
3 weeks
Duration
Helpful?
Reviews
2 reviews for this Gig
| (2) | ||
| (0) | ||
| (0) | ||
| (0) | ||
| (0) |
Rating Breakdown
- Seller communication level
- Quality of delivery
- Value of delivery
Sort By
Most relevant
R rodrigobsb2001
Brazil
Ongoing collaborationExcellent service! Allex was very professional, attentive, and delivered high-quality work. Communication was clear throughout the process, and the final result met my expectations very well. I highly recommend his services and would definitely work with him again.
$50-$100
Price
13 days
Duration
M Seller's Response
Helpful?R rodrigobsb2001
Brazil
Ongoing collaborationAllex did a great job and delivered exactly what I needed. He was professional, responsive, and paid close attention to detail throughout the project. Communication was smooth, the work was delivered on time, and the final result matched my expectations. I would definitely recommend him and work with him again.
$50-$100
Price
3 weeks
Duration
Helpful?
