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Junior Fastapi Developer Jobs in California (NOW HIRING)

Data Engineer

San Francisco, CA · On-site

$140K - $160K/yr

Build secure backend APIs (Python/FastAPI) to expose AI-powered capabilities * Ensure observability ... Mentor junior engineers and contribute to architectural standards and best practices * Drive ...

Data Engineer

San Francisco, CA · On-site

$140K - $160K/yr

Build secure backend APIs (Python/FastAPI) to expose AI-powered capabilities * Ensure observability ... Mentor junior engineers and contribute to architectural standards and best practices * Drive ...

Principal Software Engineer (Python)

Irvine, CA · On-site +1

$144K - $194K/yr

Mentor Senior & Junior Engineers: Act as a technical mentor and coach, sharing expertise in Python ... Expert Python/FastAPI Developer: Proven experience in designing, scaling, and maintaining existing ...

Principal Software Engineer (Python)

Irvine, CA · On-site

$144K - $194K/yr

Mentor Senior & Junior Engineers: Act as a technical mentor and coach, sharing expertise in Python ... Expert Python/FastAPI Developer: Proven experience in designing, scaling, and maintaining existing ...

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Showing results 1-20

Junior Fastapi Developer information

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 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 are the key skills and qualifications needed to thrive as a Junior FastAPI Developer, and why are they important?

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 Junior FastAPI Developers?

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 most commonly searched types of Fastapi Developer jobs in California? The most popular types of 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:
Infographic showing various Junior Fastapi Developer job openings in California as of July 2026, with employment types broken down into 84% Full Time, 5% Part Time, 2% Temporary, and 9% Contract. Highlights an 82% Physical, 3% Hybrid, and 15% Remote job distribution.
Data Engineer

Data Engineer

Cargomatic

San Francisco, CA • On-site

$140K - $160K/yr

Other

Medical, Dental, Vision, Life, Retirement, PTO

Re-posted 18 days ago


Cargomatic rating

4.3

Company rating: 4.3 out of 10

Based on 5 frontline employees who took The Breakroom Quiz


Job description

Senior Data Architect - Data Engineering

Location: San Francisco, CA
Reports To: VP of Engineering
FLSA Status: Exempt
Employment Type: Full-Time
Compensation: $140,000 - $160,000 annually (based on experience)

About Cargomatic

Cargomatic is transforming the local trucking industry with cutting-edge technology that connects shippers and carriers in real time. Every product that humans build, grow, or sell has spent time on a truck. Local trucking is the lifeblood of every regional economy, yet this $82 billion industry still relies heavily on outdated systems. Cargomatic is bringing transparency, efficiency, and intelligence to local freight through modern technology and data-driven solutions.

We are solving complex, real-world logistics problems every day. If you thrive in a fast-paced environment, enjoy building scalable systems, and want to help shape the future of AI-powered logistics, we'd love to meet you.

Position Summary

Cargomatic is seeking a Senior Data Architect - Data Engineering to design and build scalable, cloud-native data infrastructure that powers analytics, machine learning, and AI-driven applications. This role combines deep data architecture expertise with hands-on experience in modern data platforms and LLM-enabled application development.

You will lead the design of enterprise-grade data models, architect RAG systems, implement agentic workflows, and integrate secure, production-ready LLM capabilities into our ecosystem. This is a high-impact role with significant ownership, visibility, and opportunity to shape the future of intelligent logistics technology.

Key Responsibilities

Data Architecture & Engineering

  • Design and build scalable, cloud-native data pipelines (batch and streaming) supporting analytics, ML, and AI-powered applications

  • Architect enterprise-grade data models across data lakes, warehouses, and real-time systems (Snowflake, Databricks, Kafka, DBT)

  • Define standards for data governance, reliability, performance, and cost optimization

  • Optimize storage formats and distributed data systems (Parquet, Delta Lake, Iceberg)

AI & LLM-Enabled Systems

  • Develop Retrieval-Augmented Generation (RAG) systems integrating structured and unstructured enterprise data

  • Design and implement agentic workflows using frameworks such as LangChain, LangGraph, LlamaIndex, n8n, or similar

  • Integrate LLM APIs (OpenAI, Anthropic, or similar) into secure, production-ready applications

  • Implement guardrails, validation layers, monitoring, and evaluation frameworks to mitigate hallucination, prompt injection, and data security risks

Backend & API Development

  • Build secure backend APIs (Python/FastAPI) to expose AI-powered capabilities

  • Ensure observability, monitoring, and cost controls across AI and data services

  • Contribute to microservices architecture and distributed system design

Collaboration & Leadership

  • Partner cross-functionally with Product, Engineering, and Operations to translate business requirements into scalable technical solutions

  • Mentor junior engineers and contribute to architectural standards and best practices

  • Drive innovation in data engineering and AI-powered logistics systems

Qualifications

  • Bachelor's degree in Computer Science or equivalent practical experience

  • 8+ years of software or data engineering experience in production environments

  • Strong expertise in data modeling, distributed systems, and scalable cloud architectures

  • Hands-on experience with ETL/ELT frameworks and streaming technologies (Kafka, Spark, HEVO, Snowflake, DBT, etc.)

  • Advanced SQL skills and deep understanding of modern storage formats

  • Proficiency in Python and RESTful API development

  • Experience integrating LLM APIs into production applications

  • Strong understanding of system reliability, observability, and cost management in cloud environments

Desired Experience

  • Experience building RAG pipelines including embeddings, vector search, chunking strategies, and hybrid retrieval

  • Experience designing multi-agent or agentic AI workflows with orchestration frameworks

  • Knowledge of LLM evaluation, monitoring, and tracing tools (LangSmith or similar)

  • Experience with microservices architecture and distributed system design

  • Exposure to transportation, logistics, or supply chain domains

  • Active GitHub contributions or demonstrated passion for emerging AI and data technologies

Why Join Cargomatic?

We offer competitive compensation and a comprehensive benefits package, including:

  • Medical, Dental, and Vision insurance

  • 401(k) with company match

  • Flexible Spending Accounts (FSA)

  • Company-paid Life and Disability insurance

  • Flexible Paid Time Off (PTO) and company holidays

  • Paid Parental Leave

  • Employee Assistance Program (EAP)

  • Opportunity to build cutting-edge AI solutions in a high-growth logistics technology company

  • Collaborative, high-impact team environment

Cargomatic is proud to be an Equal Opportunity Employer. We are committed to creating a diverse and inclusive workplace where all employees feel valued and empowered to succeed.


What Cargomatic employees say

Hours and flexibility

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