You will get a Backend Developer for Node.js, MongoDB or PostgreSQL
Project details
Need a solid, secure, and scalable backend infrastructure for your application? I specialize in building high-performance server-side logic, custom REST APIs, and optimized database architectures using Node.js, Express.js, Python (FastAPI), MongoDB, and PostgreSQL (including Sequelize).
I focus on building systems that handle data efficiently, maintain security best practices, and scale smoothly as your user base grows.
What You'll Get:
• Robust Backend Architecture with Node.js, Express, or FastAPI
• Custom REST API Design, Development & Integration
• Database Schema Design & Optimization (PostgreSQL, MongoDB, Sequelize)
• Secure Authentication & Authorization Systems
• Query Performance Tuning & Data Handling
• Third-Party Service Integrations
Why Work With Me:
With deep expertise in database management and backend engineering, I ensure your application's data layer remains secure, fast, and maintainable.
Note: Please message me before placing an order to map out your architecture needs.
I focus on building systems that handle data efficiently, maintain security best practices, and scale smoothly as your user base grows.
What You'll Get:
• Robust Backend Architecture with Node.js, Express, or FastAPI
• Custom REST API Design, Development & Integration
• Database Schema Design & Optimization (PostgreSQL, MongoDB, Sequelize)
• Secure Authentication & Authorization Systems
• Query Performance Tuning & Data Handling
• Third-Party Service Integrations
Why Work With Me:
With deep expertise in database management and backend engineering, I ensure your application's data layer remains secure, fast, and maintainable.
Note: Please message me before placing an order to map out your architecture needs.
Programming Languages
JavaScript, Python, TypeScriptCoding Expertise
Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$100
|
Standard
$200
|
Advanced
$400
|
|---|---|---|---|
| Delivery Time | 3 days | 6 days | 9 days |
Number of Revisions | 1 | 2 | 3 |
Number of Pages | 0 | ||
Design Customization | |||
Content Upload | |||
Responsive Design | - | - | - |
Source Code |
Optional add-ons
You can add these on the next page.
Additional Revision
+$10
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TR
Theaqib R.
Oct 15, 2025
React Website Bug Fixes and Deployment Optimization
Ali delivered good work on this React development project and I enjoyed working with him. His communication was top-notch, he met all deadlines, and his skills were reasonably strong. I strongly recommend him for his future projects.
About Ali Sher
Full Stack Developer | React, Next.js, Node.js | GIS & AI Integrations
Islamabad, Pakistan - 2:19 pm local time
What sets my work apart from a typical MERN stack profile is depth in a few specific, highvalue areas: geospatial/GIS systems (PostGIS, Mapbox, GeoServer, 3D map rendering), applied AI feature integration (structured AI-generated output with real serverside validation, not just a raw API call), and ad-platform API integrations (Meta and Google Ads, including audience/reach estimation and automated budget recommendations). I pair that with solid full stack fundamentals: clean REST API design, relational and document database modeling, and interfaces that are genuinely responsive across devices.
𝐅𝐫𝐨𝐧𝐭𝐞𝐧𝐝
- React.js and Next.js (App Router)
- TypeScript and JavaScript
- Tailwind CSS, Bootstrap, ShadCN, Mantine UI
- State management: Redux Toolkit/RTK Query, Zustand, React Query
- Map and geo UI: Mapbox GL, Leaflet, CesiumJS (3D)
- Building responsive interfaces that work well on any device
𝐁𝐚𝐜𝐤𝐞𝐧𝐝
- Node.js and Express.js; Python with FastAPI
- Designing and connecting REST APIs, JWT/OAuth2 auth, role-based access control
- PostgreSQL (including PostGIS for geospatial data, Sequelize) and MongoDB
𝐀𝐈 / 𝐋𝐋𝐌 𝐈𝐧𝐭𝐞𝐠𝐫𝐚𝐭𝐢𝐨𝐧
- OpenAI and AWS Bedrock (Claude, Qwen, and other models evaluated) structured-output prompting (JSON-schema-constrained generation), not just freeform chat responses
- Agentic tool/function-calling execution building multi-tool LLM loops that autonomously call defined functions rather than a single request/response prompt
- Server-side validation of AI output before it's trusted, e.g., recomputing totals/sums from the model's own data and rejecting responses that don't check out, rather than passing AI output straight through
- Anti-hallucination prompt design constraining a model to cite only known-real sources instead of letting it invent them
- Wiring AI generation directly into product flows (onboarding, content generation) with graceful fallbacks if the AI call fails or returns malformed output.
𝐎𝐭𝐡𝐞𝐫 𝐒𝐤𝐢𝐥𝐥𝐬
- GIS-based systems: PostGIS spatial queries, Mapbox, GeoServer (WMS/WFS), location-intelligence features
- Ad-platform APIs: Meta (Facebook/Instagram) Ads, Google Ads
- Git and GitHub, Docker, AWS (S3, App Runner, ECR)
- Working with teams using Jira, Slack, and Zoho
𝐖𝐡𝐚𝐭 𝐈 𝐂𝐚𝐧 𝐇𝐞𝐥𝐩 𝐘𝐨𝐮 𝐖𝐢𝐭𝐡
- Building full-stack web applications using React, Next.js, and Node.js or Python/FastAPI
- Designing and connecting REST APIs, including third-party integrations (ad platforms, mapping/ geo services, AI providers)
- Setting up and modeling databases in PostgreSQL (including geospatial/PostGIS data) or MongoDB
- Adding AI features that are actually reliable: structured output, server-side validation, and sane fallbacks when the model gets it wrong
- Map and location-based features: interactive maps, spatial search/filtering, 2D/3D visualization
- Role-based dashboards and multi-tenant SaaS architecture
- Fixing bugs, improving performance, and helping an existing application scale as it grows
𝐖𝐡𝐲 𝐖𝐨𝐫𝐤 𝐖𝐢𝐭𝐡 𝐌𝐞
I have over 5 years of hands-on experience across the MERN stack, Next.js, Python/FastAPI, and PostgreSQL/PostGIS. I write code that's meant to be maintained, not just code that works right now, and I've built systems that had to hold up to real usage: geospatial platforms with audit-safe data editing, AI-assisted product features with real output validation, ad-platform integrations handling live ad accounts, and government-facing systems with strict role-based access control. I keep communication clear and give regular updates so you always know where things stand. I can join an existing team or take full ownership of a project from start to finish. If you have a project in mind, especially one involving maps/GIS, AI-powered features, or ad platform integrations, feel free to reach out, and we can talk through the details.
𝐒𝐤𝐢𝐥𝐥 𝐭𝐚𝐠𝐬 (𝐤𝐞𝐲𝐰𝐨𝐫𝐝 𝐥𝐢𝐧𝐞)
Full Stack Developer | MERN Stack Developer | React Developer | Node.js Developer | Next.js Developer | React Node Developer | MERN Developer | GIS Developer | Geospatial Developer | PostGIS Developer | Mapbox Developer | AI Integration Developer | AI Agent Developer | LLM Integration | SaaS Developer | SaaS Application Development | API Developer | REST API Developer | Backend Developer | Web Application Developer | Web Development | Full Stack Development
Steps for completing your project
After purchasing the project, send requirements so Ali Sher can start the project.
Delivery time starts when Ali Sher receives requirements from you.
Ali Sher works on your project following the steps below.
Revisions may occur after the delivery date.
Database Architecture
Design and set up optimized PostgreSQL or MongoDB schemas and models.
API Development
Build secure backend endpoints, business logic, and authentication systems.