Python backend development (FastAPI) jobs

Design, build and operate AI systems end to end, from evaluation through production.
Own the architecture of AI features across the product.
Lead and guide AI development efforts and set technical direction.
Address scaling challenges as the system supports more and more users.
Ship meaningful improvements to AI features early in the role.

Requirements

Engineering degree from a highly ranked university
Nice to have: Earlier experience launching a new venture as one of its leaders

Skills

LLM-powered software development LLM application frameworks model scaling prompt design Python backend development Python

Python Developer

ve3 · Posted Nov 12, 2026

Open

Maidenhead, England, United Kingdom +1 more
Full-time · Senior
5+ years

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Senior Python Developer responsible for designing, developing, and maintaining scalable backend services and RESTful APIs.

Locations (2)

Maidenhead, England, United Kingdom
Windsor, United Kingdom

Compensation

Competitive salary and benefits package.

Responsibilities

Design and develop scalable backend services and RESTful APIs using Flask, FastAPI, or Django (DRF).
Develop robust integration with SQL (PostgreSQL) and NoSQL databases like MongoDB.
Optimize performance and scalability of applications handling large volumes of data.
Write clean, modular, and well-documented code following best practices.
Contribute to architectural decisions and peer code reviews.

Requirements

Nice to have: Docker
Nice to have: AWS
Nice to have: GCP
Nice to have: Azure
Nice to have: ML model serving

Staff Backend Engineer

Manychat, Inc · Posted Nov 10, 2026

Open

Barcelona, Catalonia, Spain
Hybrid
Full-time · Staff

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Lead technical decisions and architecture for Manychat's Brands product, owning backend services and ensuring reliability and performance.

Responsibilities

Set architecture and technical priorities for Brands
Decide logic placement between Python and PHP services
Lead system-level changes and data migrations
Define reliability and performance requirements
Find root causes of slowdowns and incidents

Requirements

Nice to have: PHP
Nice to have: ETL/DWH pipelines
Nice to have: Analytics systems
Nice to have: Environment configuration
Nice to have: CI/CD

Skills

Python backend development FastAPI Pydantic SQLAlchemy PostgreSQL Redis Celery AWS

Software Engineer

Unravel Carbon Pte Ltd · Posted Nov 12, 2026

Open

Tokyo, Kantō, Japan
Full-time
2+ years

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Full-stack Software Engineer in Japan to build and ship product features for Unravel Carbon’s decarbonization platform.

Responsibilities

Build and ship the product
Design, build and ship production features across the platform, including our carbon calculation engine, data ingestion pipelines and AI-powered workflows
Take ownership of complex problems end to end, from scoping and technical design through to delivery and iteration
Develop integrations with customers' accounting and ERP systems
Support global users and local requirements

Requirements

Bachelor's degree in Computer Science, Engineering, IT, or equivalent practical experience
Nice to have: Experience building data-intensive products
Nice to have: Experience building with LLMs or agentic workflows
Nice to have: Integrations with accounting or ERP systems
Nice to have: Cloud services (AWS, GCP or Azure)

Skills

Python backend development (Flask, Django)Front End Web development (ReactJS)SQL and NoSQL databases (Postgres, DuckDB, MongoDB)

Python Full Stack Developer

SCI SOLUTIONS GLOBAL · Posted Nov 9, 2026

Open

Deerfield, Illinois, United States
On-site
Contract

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Full Stack Developer – Python & Angular for a long-term contract.

Responsibilities

Develop and maintain full-stack applications using Python and Angular
Build and integrate backend APIs and frontend components
Support implementation activities and application integrations
Troubleshoot technical issues and ensure application quality
Collaborate with cross-functional teams throughout the implementation

Requirements

Nice to have: clinical domain experience
Nice to have: healthcare technology
Nice to have: clinical applications
Nice to have: enterprise implementations

Skills

Python backend development Angular frontend development TypeScript JavaScript REST API development and integration Database development and integration

Applied AI Engineer

Raydar · Posted Nov 4, 2026

Open

San Diego, California, United States +2 more
Hybrid
Full-time
$160K–$250K per year

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Design and build the AI layer of a software product, defining how the system reasons, coordinates multi-step tasks and interacts with users.

Locations (3)

San Diego, California, United States
Los Angeles, California, United States
San Francisco Bay Area, California, United States

Compensation

Salary: $160K - $250K - Bonus - Equity

Responsibilities

Build multi-step agent workflows that track state, propose actions and carry tasks through to completion.
Link language models to external functions, stored context and lookup layers that span mixed data sources.
Safeguard sensitive information and design fallback behavior for failed tools, incomplete inputs and unreliable model outputs.
Set up test harnesses that score how well generative features perform and feed results back into iteration.

Senior Staff Software Engineer (Sr. Consultant) - GenAI Enablement

Visa · Posted Oct 5, 2026

Open

Ashburn, Virginia, United States
Hybrid
Full-time · Senior
$155K–$248K per year
8+ years

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Lead full‑stack GenAI‑enabled application development, mentor engineering teams, and design scalable AI systems integrated with Visa’s product ecosystem.

Compensation

For roles located in the US, the estimated salary range for this position is $154,900.00 to $ 248,200.00 USD per year, which may include potential sales incentive payments (if applicable).

Responsibilities

Architect and deliver GenAI‑enabled applications leveraging LangGraph, LangChain, Haystack, and AWS GenAI services
Build reusable GenAI components, SDKs, pipelines, and abstraction layers
Develop end‑to‑end AI applications using Python, FastAPI, Flask, Node.js, React + TypeScript
Design intuitive, responsive, production‑grade user interfaces for GenAI‑powered tools
Design and build data workflows supporting AI systems, including ETL/ELT pipelines and embedding pipelines

Requirements

Bachelor’s Degree
Advanced Degree (Masters, MBA, JD, MD)
PhD
Nice to have: Databricks/Spark pipelines
Nice to have: MLFlow

Skills

GenAI Architecture & Framework Development LangGraph LangChain Haystack

Python backend development (FastAPI) jobs

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