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Junior Backend Developer Jobs in Rancho Cucamonga, CA

MongoDB

Senior Python Engineer

Ontario, CA · On-site +1

$123K - $166K/yr

Our mission is to increase developer adoption, satisfaction and retention by providing a reliable ... Enjoy collaborating with teammates, and mentoring junior engineers and interns * Are self-motivated ...

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$90.9K

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How much do junior backend developer jobs pay per year?

As of Aug 6, 2026, the average yearly pay for junior backend developer in Rancho Cucamonga, CA is $90,926.00, according to ZipRecruiter salary data. Most workers in this role earn between $68,500.00 and $88,900.00 per year, depending on experience, location, and employer.

How much do junior backend developers make?

Junior backend developers in the US typically earn between $50,000 and $80,000 annually, depending on location, experience, and skills such as knowledge of programming languages like Python or Java. Entry-level salaries may be lower in some regions, while those with additional certifications or experience can earn more.

What are the main responsibilities of a junior backend developer?

As a Junior Backend Developer, you'll typically be involved in writing and maintaining server-side logic, integrating with databases, and supporting the development of APIs that connect various parts of an application. You may work closely with front-end developers, QA testers, and project managers to implement new features and resolve technical issues. Your daily responsibilities could also include debugging code, participating in code reviews, and updating documentation. This entry-level role offers an excellent opportunity to build foundational development skills while collaborating within a larger software engineering team.

What is a junior backend developer?

A Junior Backend Developer is an entry-level software engineer who focuses on server-side development, databases, and API integrations. They typically work with languages like Python, Java, or Node.js and collaborate with frontend developers to ensure seamless application functionality. Their responsibilities include writing and maintaining code, debugging issues, and optimizing performance. Junior Backend Developers often follow the guidance of senior developers and gradually take on more complex tasks as they gain experience.

What are the key skills and qualifications needed to thrive as a junior backend developer?

To thrive as a Junior Backend Developer, you need a solid understanding of programming languages like Python, Java, or Node.js, alongside knowledge of databases and basic software development principles. Familiarity with tools such as version control systems (e.g., Git), RESTful APIs, and frameworks like Django or Express is highly valued, and online certifications in these technologies can be beneficial. Strong problem-solving, effective communication, and a willingness to learn make candidates stand out in a collaborative development environment. These skills and qualities are crucial for building reliable backend systems, debugging issues, and contributing effectively to team projects.

Is a junior backend developer entry-level?

Yes, a junior backend developer position is typically considered entry-level, suitable for candidates with limited professional experience or recent graduates. It often involves learning foundational skills in server-side programming, databases, and frameworks, with opportunities for skill development and growth.
What job categories do people searching Junior Backend Developer jobs in Rancho Cucamonga, CA look for? The top searched job categories for Junior Backend Developer jobs in Rancho Cucamonga, CA are:
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Junior Backend Developer jobs near you
Infographic showing various Junior Backend Developer job openings in Rancho Cucamonga, CA as of August 2026, with employment types broken down into 75% Full Time, and 25% Contract. Highlights an 75% In-person, and 25% Hybrid job distribution, with an average salary of $90,926 per year, or $43.7 per hour.

Senior Python Engineer

MongoDB

Ontario, CA • On-site, Remote

$123K - $166K/yr

Other

Re-posted 7 days ago

Job description

Our Database Experience (DBX) Team

A great MongoDB experience starts with great tools.

The Database Experience team builds the libraries and tools that developers use day-to-day working with MongoDB. Our mission is to increase developer adoption, satisfaction and retention by providing a reliable, enjoyable interface for developers and other end-users.

Our senior engineers are typically specialists in a particular programming language, but are capable of contributing to projects in other languages as well.

For this role, we're looking for someone who will enjoy designing, writing, and supporting open source libraries for the Python ecosystem developers that use MongoDB. This is an opportunity to make a major impact at MongoDB as Python is one of the most popular runtimes for MongoDB users, and our driver has over 3 million daily pypi downloads.

You might be right for this role if you...
  • Have substantial experience writing high-quality software in Python
  • Have extensive knowledge in Python tools and frameworks, scientific python and web development frameworks
  • Have practical experience with AI/ML frameworks and technologies in Python, including large language models and agentic tools are a plus
  • Have an interest in learning and staying up-to-date with Python ecosystem trends and best practices and incorporating them into your work
  • Can make pragmatic design decisions, balancing tradeoffs such as usability, maintainability and delivery time
  • Want to, or already do, participate in open source software development and communities, both online via e.g. GitHub and optionally through conferences and speaking engagements
  • Communicate well, internally and externally, both verbally and in writing
  • Enjoy collaborating with teammates, and mentoring junior engineers and interns
  • Are self-motivated, organized, and have strong time management skills
You'll be on the team responsible for...
  • Developing and supporting the MongoDB Python drivers and subsidiary libraries (PyMongo, Django MongoDB Backend, PyMongoArrow, LangChain MongoDB) and related software, collaborating with peers in our distributed world-wide engineering team
  • Writing and maintaining open source specifications defining common behavior and APIs shared across all of our drivers
  • Investigating bugs and support requests from commercial customers, open source users, and internal users for the libraries our team maintains
  • Working with our Product and Server teams on designs and specifications for new user-facing MongoDB features
Success in this role means...
  • Within one month, you will understand the high-level architecture of the drivers and how MongoDB works, and will have completed a few small bug fixes and/or feature tickets
  • Within three months, you will be contributing effectively day-to-day, fixing bugs, implementing features, investigating and responding to open source user and customer issues, and reviewing your peers' code
  • Within six months, you'll have implemented major, planned new features, contributed to our common driver specifications, shipped a major feature in an open source library, and will be collaborating with the Product team to help craft our roadmap
  • Within twelve months, you'll have significantly improved the quality, performance and maintainability of our codebase, and will be taking the lead in designing and specifying major new features
About MongoDB

MongoDB is built for change, empowering our customers and our people to innovate at the speed of the market. We have redefined the data platform for the AI era, enabling builders to create, transform, and disrupt industries with software. MongoDB's unified data platform, the most widely available, globally distributed data platform on the market, helps organizations modernize legacy workloads, embrace innovation, and unleash AI. Our cloud-native platform, MongoDB Atlas, is the only globally distributed, multi-cloud data platform and is available across AWS, Google Cloud, and Microsoft Azure.

With offices worldwide and over 67,000 customers, including 75% of the Fortune 100 and AI-native startups, relying on MongoDB for their most important applications, we're powering the next era of software.

Our compass at MongoDB is our Leadership Commitment, guiding how and why we make decisions, show up for each other, and win. It's what makes us MongoDB.

To drive the personal growth and business impact of our employees, we're committed to developing a supportive and enriching culture for everyone. From employee affinity groups, to fertility assistance and a generous parental leave policy, we value our employees' wellbeing and want to support them along every step of their professional and personal journeys. Learn more about what it's like to work at MongoDB, and help us make an impact on the world!

MongoDB is committed to providing any necessary accommodations for individuals with disabilities within our application and interview process. To request an accommodation due to a disability, please inform your recruiter.

MongoDB is an equal opportunities employer.

Req ID: 1273396098

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