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Junior Fastapi Developer Jobs in California (NOW HIRING)

Prosum Inc.

Junior Full Stack Engineer

Santa Monica, CA · On-site

$70K - $95K/yr

Junior Full Stack Engineer Salary Range: $70,000-$95,000 About the Role We are seeking a Junior ... Develop backend functionality and REST API endpoints using Python/FastAPI , with guidance from ...

AI Talent Now

Senior Product Engineer

Palo Alto, CA · On-site

$140K - $250K/yr

Has conducted code reviews and PRs for more junior engineers Education * Degree from top-20 CS program - this is a requirement for those with Technical Skills * Proficient in Python, FastAPI, and ...

Mosaic.tech

Member of Technical Staff

San Francisco, CA · On-site

Lead design reviews, set technical direction, and mentor junior engineers. Tech Stack * Backend & Infra: Python, FastAPI, PostgreSQL, Redis, Go, Kafka, Railway, AWS/GCP * Frontend & UX: React, Next ...

Prosum Inc.

Senior Full Stack Engineer - AI

Santa Monica, CA · On-site

$135K - $163K/yr

Design, build, and maintain scalable full stack applications using Python, FastAPI, React.js, and ... Mentor mid-level and junior engineers through pair programming, design sessions, technical guidance ...

OpenReq

SuperDial - FDE

San Francisco, CA · On-site

$130K - $160K/yr

Design and implement backend services and APIs using Python (FastAPI or similar) * Work directly ... Help shape engineering best practices, mentoring junior developers as we grow About You: * 2+ years ...

Capgemini

AI Architect/Developer

Long Beach, CA · On-site

$82K - $193K/yr

Act as a lead developer to mentor junior staff and ensure best practices in code quality and model ... Strong background in RESTful API development (FastAPI, Flask) and data pipeline architecture ...

New

United Airlines

AI Architect/Developer

Santa Clara, CA · Hybrid

$82K - $193K/yr

Act as a lead developer to mentor junior staff and ensure best practices in code quality and model ... Strong background in RESTful API development (FastAPI, Flask) and data pipeline architecture ...

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Junior Fastapi Developer information

What is a Junior FastAPI Developer?

Junior FastAPI Developers are entry-level software engineers who specialize in building web applications and APIs using FastAPI, a modern Python web framework. They are responsible for writing, testing, and maintaining backend code, often under the guidance of more experienced developers. Their tasks typically include developing RESTful APIs, integrating databases, and ensuring application performance and security. Junior FastAPI Developers usually have a basic understanding of Python, web technologies, and REST principles. They play an important role in supporting projects, learning best practices, and growing their technical skills.

What are the key skills and qualifications needed to thrive as a Junior FastAPI Developer?

To thrive as a Junior FastAPI Developer, you need foundational knowledge of Python programming, RESTful API concepts, and experience working with FastAPI frameworks, supported by a relevant degree or coding bootcamp. Familiarity with Git for version control, SQL or NoSQL databases, and containerization tools like Docker is typically expected. Strong problem-solving skills, eagerness to learn, and effective communication make candidates stand out in collaborative development environments. These competencies ensure efficient, high-quality API development and seamless teamwork in agile software projects.

What are some typical challenges a Junior FastAPI Developer may face when joining a new team?

As a Junior FastAPI Developer, you may encounter challenges such as adapting to established codebases, understanding the team's API design patterns, and ensuring your code aligns with both FastAPI best practices and your organization's standards. Collaborating closely with senior developers and participating in code reviews can help accelerate your learning process. Additionally, you may need to quickly familiarize yourself with related tools such as Docker, Git, and testing frameworks, as well as the team's workflow for deploying and maintaining APIs in production environments.

What is the difference between Junior Fastapi Developer vs Junior Python Developer?

AspectJunior Fastapi DeveloperJunior Python Developer
Required CredentialsBasic Python knowledge, familiarity with FastapiBasic Python knowledge, possibly some frameworks
Work EnvironmentWeb backend development, API creationGeneral software development, scripting
Employer & Industry UsageTech companies, startups, web servicesBroad industry, including data analysis, automation
Common Search & ComparisonYesYes

The main difference is that a Junior Fastapi Developer specializes in building APIs using Fastapi, while a Junior Python Developer has broader Python programming skills without specific focus on web APIs. Fastapi developers typically work in web backend environments, whereas Python developers may work across various domains.

What are the most commonly searched types of Fastapi Developer jobs in California?

The most popular types of Fastapi Developer jobs in California are:

What are popular job titles related to Junior Fastapi Developer jobs in California?

For Junior Fastapi Developer jobs in California, the most frequently searched job titles are:

What job categories do people searching Junior Fastapi Developer jobs in California look for?

The top searched job categories for Junior Fastapi Developer jobs in California are:

What cities in California are hiring for Junior Fastapi Developer jobs?

Cities in California with the most Junior Fastapi Developer job openings:

Junior Fastapi Developer jobs near you
Infographic showing various Junior Fastapi Developer job openings in California as of September 2026, with employment types broken down into 100% Full Time. Highlights an 66% In-person, and 34% Remote job distribution.

Junior Software Engineer

San Jose, CA • On-site

Xoriant Corporation
IT Services • 1 - 5K employees
Learn more about Xoriant Corporationexternal

Other

Re-posted 8 hours ago

Job description

Job Title: Junior Software Engineer

Location: San Jose, CA (Onsite)

Description

We''re looking for a junior software engineer who can help build production applications powered by agentic AI. You''ll work primarily in Python, designing and integrating APIs and shipping features that incorporate LLM capabilities into real software systems.

Requirements

• BS in Computer Science, Software Engineering, or related field — or equivalent practical experience

• 0 – 2 years of software engineering experience; internships, co-ops, and substantial personal/open-source projects count

• Solid Python fundamentals: writing clean, testable code, working with common tooling (git, virtual environments, debugging), and reading others'' code

• Experience building or integrating with REST APIs, e.g., experience in designing endpoints (FastAPI, Flask, Django), consuming third-party APIs, handling authentication, pagination, and/or error cases

• Basic software engineering hygiene: version control, code review, writing tests, and working in a team workflow

• Familiarity with agentic AI concepts — tool/function calling, prompt chaining, or agent loops — demonstrated through coursework, hackathons, personal projects, or work experience. Exposure to frameworks like LangGraph, LangChain, or similar is a strong plus

• Some hands-on experience calling LLM APIs (OpenAI, Anthropic, or open-source models) as part of a larger application Bonus

• Exposure to databases (SQL or NoSQL), caching, or message queues

• Experience with async/concurrent programming in Python

• Familiarity with RAG concepts: embeddings, vector databases, retrieval pipelines

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