You will get a Production-Ready API Integration for SaaS Backends
Project details
This service is for SaaS teams that need reliable, production-ready API integrations in their backend.
I integrate third-party APIs into existing or new backends with a strong focus on correctness, security, and long-term maintainability — not quick hacks or fragile scripts.
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What I can help you with
• Integrating third-party APIs (payments, auth, messaging, analytics)
• Designing or extending REST APIs in Node.js / NestJS
• Secure authentication (OAuth2, JWT, API keys)
• Data validation, error handling, and retries
• Webhooks and async workflows
• Refactoring or fixing broken API integrations
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How I work
I review the API documentation and your backend context, then design a clean integration that fits your system.
All integrations are implemented with clear structure, proper error handling, and documentation.
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This service is a good fit if
✔ You need a stable API integration for a SaaS backend
✔ You care about clean architecture and reliability
✔ You want backend work done right the first time
✘ Not for frontend-only tasks
✘ Not for no-code or automation tools
If you need a serious API integration that works reliably in production, this service is a good fit.
I integrate third-party APIs into existing or new backends with a strong focus on correctness, security, and long-term maintainability — not quick hacks or fragile scripts.
---
What I can help you with
• Integrating third-party APIs (payments, auth, messaging, analytics)
• Designing or extending REST APIs in Node.js / NestJS
• Secure authentication (OAuth2, JWT, API keys)
• Data validation, error handling, and retries
• Webhooks and async workflows
• Refactoring or fixing broken API integrations
---
How I work
I review the API documentation and your backend context, then design a clean integration that fits your system.
All integrations are implemented with clear structure, proper error handling, and documentation.
---
This service is a good fit if
✔ You need a stable API integration for a SaaS backend
✔ You care about clean architecture and reliability
✔ You want backend work done right the first time
✘ Not for frontend-only tasks
✘ Not for no-code or automation tools
If you need a serious API integration that works reliably in production, this service is a good fit.
Programming Languages
JavaScript, TypeScriptCoding Expertise
Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$300
|
Standard
$500
|
Advanced
$800
|
|---|---|---|---|
| Delivery Time | 3 days | 5 days | 7 days |
Number of Revisions | 1 | 2 | 2 |
Design Customization | - | - | - |
Content Upload | - | - | - |
Responsive Design | - | - | - |
Source Code |
Optional add-ons
You can add these on the next page.
Additional API or Integration
+$200
Post-Delivery Support (30 days)
+$150
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KS
Karolis S.
Dec 22, 2024
Full stack Symfony web developer
JB
Joseph B.
Mar 23, 2022
PHP Developer with Symfony experience
Aymen was nice to work with and had good frontend skills, but had trouble dealing with more complex tasks.
GE
Glen E.
Feb 14, 2022
Symfony 4 Strange Issue With DateTimeType Format Needs Fixing
Very good communication, completed the task very quickly and great to work with
MA
Moumen A.
Feb 8, 2022
Symphony Developer
Ayman was super active and attached to details, he was following up on each task given to him and added value to the team.
I am sure that he will be an added value to your team and project.
Good luck 👍
I am sure that he will be an added value to your team and project.
Good luck 👍
About Aymen
Senior SaaS Backend Engineer | Node.js (NestJS) | AWS
Tunis, Tunisia - 2:31 pm local time
I work on real production systems — not demos or tutorials. My focus is long-term maintainability, performance, and clean architecture.
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What I specialize in
• Designing and building SaaS backends & APIs
• NestJS architecture (modular, testable, maintainable)
• Scaling Node.js applications in production
• AWS infrastructure (Docker, Kubernetes, CI/CD)
• Refactoring and stabilizing existing systems
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Clients typically hire me to
• Turn an MVP into a production-ready SaaS
• Fix backend code that doesn’t scale or is hard to maintain
• Add complex backend features safely
• Improve performance, reliability, and cloud costs
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How I work
• I ask the right questions early to avoid costly mistakes
• I deliver clean, documented, testable code
• I communicate clearly and proactively
• I treat your product as a long-term system, not a quick task
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Core stack
• Backend: Node.js, NestJS, TypeScript
• Cloud & DevOps: AWS, Docker, Kubernetes, CI/CD
• Databases: PostgreSQL, MySQL, MongoDB, Redis
If you’re looking for a senior backend engineer who can own features end-to-end and think in systems, let’s talk.
Steps for completing your project
After purchasing the project, send requirements so Aymen can start the project.
Delivery time starts when Aymen receives requirements from you.
Aymen works on your project following the steps below.
Revisions may occur after the delivery date.
Requirements review & technical alignment
Integration design & workflow planning