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Backend & Cloud
Python & FastAPI Engineering

Python & FastAPI Development Services - High-Speed Python APIs
Powered by FastAPI & AI

We build ultra-fast asynchronous FastAPI backends, AI model inference servers, and data pipelines combining Python's machine learning ecosystem with sub-10ms ASGI API performance.
180+Python & FastAPI APIs Built
sub-10msFastAPI Async Latency
99.99%Production Uptime
Since2019
Core Capabilities

Enterprise Python & FastAPI Engineering

From async RESTful API microservices to AI model deployment and distributed background task queues.

FastAPI Async Microservices

Asynchronous ASGI Python microservices leveraging Pydantic validation and automatic OpenAPI Swagger docs.

AI & ML Model Serving APIs

High-throughput inference REST APIs serving PyTorch, TensorFlow, Scikit-learn, and Hugging Face transformer models.

SQLAlchemy & Vector Databases

PostgreSQL database ORM with SQLAlchemy / SQLModel alongside Pinecone, Qdrant, and pgvector embeddings.

Celery & Redis Task Queues

Background task workers for heavy data crunching, scheduled cron jobs, and asynchronous webhooks with Celery.

OAuth2 & Security Guards

Enterprise authentication using OAuth2 password flow, JWT tokens, RBAC roles, and rate limiting middleware.

Django & Flask Systems

Full-featured Django REST Framework backends and lightweight Flask microservices for specialized business logic.

Why Choose Mind Stack Labs

Async Speed. AI Native Intelligence.

FastAPI combines high-concurrency async performance with Python's rich machine learning library ecosystem.

Why FastAPI for Your Backend?

  • Async I/O performance on par with NodeJS and Go via Starlette and Uvicorn
  • Pydantic type hints eliminate 90% of data validation bugs automatically
  • Native support for AI, LLMs, machine learning, and data science libraries
  • Auto-generated interactive Swagger & ReDoc API documentation
  • Clean, maintainable Python code reduces backend development costs
  • High concurrency for processing real-time streaming data and WebSockets
Python & FastAPI specialists since 2019
Certified PyTorch & TensorFlow AI engineers
180+ Python REST & gRPC backends deployed
Dedicated Python backend lead for every project
100% Type-hinted Pydantic v2 schemas & Pytest test suites
Complete IP ownership & strict NDA protection guaranteed
Docker containerization & Gunicorn/Uvicorn deployment
Free 30-day post-launch technical support
Industry Expertise

Industries We Empower

Building high-performance Python APIs, AI inference microservices, and data processing engines.

AI & Machine Learning

Model Serving & Vector Search

HealthTech & Bio

HIPAA Compliant Data Pipelines

FinTech & Analytics

High-Speed Financial Data Processing

SaaS Platforms

Multi-tenant FastAPI Microservices

E-Commerce

AI Recommendation & Search Engine

Data Mining & Scraping

Async Playwright & Scrapy Services

What We Architect
Python & FastAPI Solutions

Python Backend Solutions We Build

From async REST APIs to machine learning serving microservices and task queues.

Async FastAPI REST & gRPC APIs
FastAPI Engine01

Async FastAPI REST & gRPC APIs

Blazing fast Python backend endpoints with automated OpenAPI schemas, Pydantic request validation, and OAuth2 security.

Workflow Chain
FastAPI Router→Pydantic Schema→SQLAlchemy 2.0→Uvicorn ASGI
AI Inference & LLM Pipelines
AI Model Microservice02

AI Inference & LLM Pipelines

Deploy machine learning models and LLM agent chains (LangChain / LlamaIndex) behind scalable Python API gateways.

Workflow Chain
PyTorch Model→FastAPI Wrapper→pgvector / Qdrant→GPU Acceleration
Celery & Distributed Data Workers
Task Queue03

Celery & Distributed Data Workers

Asynchronous task processing pipelines with Celery and Redis to execute heavy calculations, PDF processing, and webhooks.

Workflow Chain
Task Trigger→Redis Broker→Celery Worker→Result Backend
Full-Stack Django & DRF Applications
Django Enterprise04

Full-Stack Django & DRF Applications

Robust enterprise portals leveraging Django Admin, Django REST Framework (DRF), and PostgreSQL database structures.

Workflow Chain
Django ORM→DRF Serializers→JWT Auth→PostgreSQL
Real-time Data Streaming APIs
Web Analytics05

Real-time Data Streaming APIs

Event streaming pipelines using Python, WebSockets, Kafka, and Redis to process millions of live data points.

Workflow Chain
WebSocket Server→Kafka Stream→Pandas Filter→Client Push
Async Web Scraping & Crawling
Data Scraping06

Async Web Scraping & Crawling

Custom headless browser automation using Python, Playwright, Scrapy, and BeautifulSoup with proxy rotation.

Workflow Chain
Proxy Mesh→Playwright Async→Parser Engine→Database Ingest
Technologies

Python Tech Stack

Asynchronous ASGI frameworks and machine learning model serving libraries.

PythonPython
FastAPIFastAPI
DjangoDjango
PyTorchPyTorch
PostgreSQLPostgreSQL
RedisRedis
DockerDocker
CeleryCelery
OpenAIOpenAI
Our 4-Step Engineering Process

From Specs to Production FastAPI Service

Phase 01

Architecture & Data Model

Define async API contracts, Pydantic schemas & database ERDs.

API SpecificationPydantic SchemasDB Models
Phase 02

FastAPI Core Development

Write async Python endpoints, integrate ORM & authentication.

Async RoutersSQLAlchemy ORMOAuth2 / JWT
Phase 03

AI & Task Queue Integration

Plug in ML models, Celery task workers & Redis caching layers.

Model InferenceCelery WorkersPytest Suite
Phase 04

Containerized Deployment

Package with Docker, deploy on AWS/GCP with Uvicorn & Gunicorn.

Docker ComposeUvicorn ASGIPrometheus Metrics
Advanced
Python Architecture

Enterprise Python Engine Capabilities

From Pydantic data validation and auto-generated Swagger docs to vector embeddings search and async workers.

Flagship FeaturePydantic v2 & Type Hints

Strict Type Safety & Auto Documentation

Leverage Pydantic v2 Rust-powered data parsing to automatically sanitize incoming JSON request bodies and generate live OpenAPI interactive documentation (/docs).

AI Model ServingPyTorch & ONNX Runtime

AI Inference & Vector Embeddings

Deploy fine-tuned open-source LLMs, embeddings models, and custom computer vision networks behind sub-50ms FastAPI endpoints with GPU worker nodes.

Background WorkersCelery & Redis Broker

Distributed Task Queues & ETL Pipelines

Distribute heavy data imports, PDF generation, and scheduled cron operations across background Celery worker nodes without degrading API response times.

Async ORMSQLAlchemy 2.0 Async

Async PostgreSQL Database Connections

Utilize asyncpg drivers and SQLAlchemy 2.0 async sessions to execute non-blocking database queries over PostgreSQL and pgvector tables.

FAQ

Python & FastAPI Python & FastAPI Development Services Questions

Have questions about FastAPI, PyTorch model deployment, or asynchronous task processing? Talk with our backend lead.

Book a free technical consultation
Rapid Response

We reply to all Python & FastAPI enquiries within 24 hours.

Start Your Project

Why choose FastAPI over Django or Flask for Python backends?

FastAPI provides asynchronous ASGI execution matching NodeJS speeds, automatic OpenAPI/Swagger documentation, and zero-boilerplate data validation with Pydantic type hints.

Can Python backends handle high-concurrency real-time traffic?

Yes! Running FastAPI on Uvicorn with async/await event loops allows Python to serve tens of thousands of concurrent WebSocket and HTTP connections effortlessly.

How do you deploy Python AI models to production APIs?

We wrap PyTorch or ONNX models inside FastAPI containers, leveraging GPU acceleration, batch inference caching, and Redis task queues for sub-50ms model response times.

Do you provide automated API documentation?

Yes. FastAPI automatically generates live interactive Swagger UI (/docs) and ReDoc (/redoc) documentation straight from Pydantic type definitions.
Verified Client Reviews
Verified Reviews

Client Experiences That Speak for Themselves

Real experiences from clients who worked with us to turn ideas into production products.

Mike Pettigrew

Mike Pettigrew

Ireland

Trustpilot

“Ziyad and the entire Codex Lancers team have been simply amazing to work with while creating our 11:11 The Divine Mindset mobile app. Communication was outstanding throughout the entire project. They kept us fully informed at every stage, responded quickly, and were always patient, professional and genuinely committed to achieving the best possible result. Their feedback, ideas and suggestions were enormously helpful and significantly improved the finished app. The app they have created is stunningly beautiful in every way, with an elegant, polished design and flawless functionality. They understood our vision perfectly and brought it to life even better than we had imagined. I cannot recommend Ziyad and his team highly enough. Their technical expertise, creativity, attention to detail and dedication are exceptional. We will be using them for all our future app projects and look forward to working with them for many years to come.”

Dan Brown

Dan Brown

Finland

Trustpilot

“I’ve been building with Codelancer (Ziyad and the team) for the past plus two years, and I highly recommend them to anyone in need of a reliable development team. They are deeply committed to their clients’ vision, communicate clearly, are impressively responsive, and have consistently turned complex ideas into fully functional products. Codelancer genuinely prioritizes client success. They don’t just write code -they share valuable insights, make thoughtful suggestions, and support you at every stage of the journey. Over time, they’ve become an integral part of our team, and it’s a real pleasure to work with them and have them by our side. I am very grateful to work with them and highly recommend them to all”

Gabe Hizer

Gabe Hizer

Mexico

Trustpilot

“Great communication, excellent coding work, very open to making changes as the projects have developed. My project involved several different computer languages, for Windows, Mac, iOs, and Android. It was great that they had sufficient talent in their team to pull it all together! I have been working with them for the last almost 3 years.”

NL

Nick Lavars

Australia

Trustpilot

“Partnering with CodeX Lancers has been one of the best decisions for our project. From the initial UI/UX flow design to API implementation and complete end-to-end product guidance, their team consistently demonstrated strong product thinking. They don’t just execute tasks they ask the right questions, provide thoughtful suggestions, and help refine the overall direction of the product. Their involvement went far beyond development. They contributed strategic insights, improved workflows, and ensured that both the user experience and backend integrations were properly aligned. That level of ownership truly makes a difference. Timelines were respected, communication was clear and consistent, and every discussion felt productive and solution-focused. Instead of working with an external agency, it genuinely felt like we had added a committed product team to our side. Their attention to detail, UI clarity, structured approach, and proactive mindset gave us confidence throughout the entire journey. Highly recommended for anyone looking for a dependable team that genuinely cares about both execution and long-term product success.”

Eric Verdi

Eric Verdi

United States

Trustpilot
MC

Mark Chawke

Toronto, Canada

Clutch

“Thanks to CodeX Lancers, the paywall feature was successfully implemented. The client’s notification system was also fixed, and the error-free app was launched. The team managed the engagement well and communicated excellently with the client. They were flexible and delivered great results.”

NT

Neadom Tucker

United States

Clutch

“CodeX Lancers launched the app in the Google and Apple Play Store without errors. The team was knowledgeable about the .NET platform in its first version and completed all tasks on time.”

AK

Anup Kumar

Bengaluru, India

Clutch

“Thanks to CodeX Lancers efforts, the client has received the requested mobile app. The team provides timely deliverables, communicates excellently, and maintains accurate timesheets to verify progress daily. CodeX Lancers responsiveness and commitment have been hallmarks of their performance.”

ZM

Zainab Mithwani

United Kingdom

Clutch

“CodeX Lancers successfully delivered each project phase on time and with high quality. The team provided consistent updates throughout the project and communicated primarily through virtual meetings. Their teamwork impressed the client, resulting in a positive engagement.”

KH

Kamal Hassan

Riyadh, Saudi Arabia

Clutch

“CodeX Lancer has delivered a bug-free app published seamlessly in the Apple store. The team has managed the project excellently and communicated well through virtual meetings and email. Overall, working with CodeX Lancers has brought positive results.”

OP

Opendoor Parenting

Client Partner

Upwork

“I had a great experience working with Ziya. From the very beginning, communication was clear, professional, and consistent. He quickly understood the requirements and translated them into a high-quality working solution. What stood out most was his reliability and attention to detail. Everything was delivered on time, and any feedback or adjustments I requested were handled quickly and smoothly. He was proactive when needed and always available to explain technical aspects clearly. Overall, the collaboration was efficient, smooth, and results-driven. I highly recommend Ziya to anyone looking for a skilled and dependable developer, and I would definitely work with him again.”

LA

lawpoint

Client Partner

Upwork

“Ziya contributed to the project and was generally responsive when contacted. The engagement required additional coordination and clarification on some tasks, and timelines were somewhat longer than expected. Overall, a cooperative developer with potential, particularly if project scope and deliverables are very clearly defined from the beginning.”

LA

Luqta App

Client Partner

Upwork

“Delivered consistent results on our FlutterFlow project, driving steady progress and meeting objectives efficiently. Always helpful and proactive, with a strong can-do attitude toward tasks and execution. Collaboration with the backend team and other stakeholders was smooth and effective, contributing to strong alignment and improved overall project outcomes. We have been working with Ziya and his team on three major milestones, and overall, it has been a productive collaboration. The team demonstrated strong technical skills, responsiveness, and a commitment to delivering quality work. Design & Implementation – The team effectively translated our requirements into a visually appealing and functional UI, ensuring a smooth user experience. Timely Delivery – Most tasks were completed on time, and any delays were well-communicated in advance. Before we finished our current project we started to send them more projects.”

WF

What's for Dinner

United States

Upwork

“Ziya was incredible to work with on my project. Came to the job with clear directions and clear understanding of what I was looking for. Brought ideas to the table that I didn't think about. Excellent communication. Wonderful project knowledge and was very helpful in explaining a process that I know little about. Would definitely use again!”

YA

Yoda App

Client Partner

Upwork

“Ziya delivered our field data collection app for 70+ users on time and bug-free. His Flutter/Dart expertise is solid, and he proactively solved complex challenges including offline sync and GPS tracking without being asked. What impressed me most: clear daily communication, clean code that's easy to maintain, and thoughtful suggestions that improved our original design. When integration issues arose, he fixed them independently rather than just reporting problems. Would definitely hire again and recommend to others needing reliable Flutter development.”

Recognized & Verified Across Major Industry Platforms
Google
Google
5.0
Clutch
Clutch
5.0
Upwork
Upwork
Top Rated+
Trustpilot
Trustpilot
5.0
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