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Junior Software Developer Jobs in Simi Valley, CA

Lodestar

Software Engineer: On-board Autonomy

Los Angeles, CA · On-site

$140K - $180K/yr

  • Medical

  • Dental

  • Vision

  • Retirement

  • PTO

Pay Range: * (E1) Junior Software Engineer: $120,000 - $145,000 / year * (E2) Software Engineer: $140,000 - $180,000 / year * (E3) Senior Software Engineer: Competitive * Meaningful equity incentives ...

Lodestar

Software Engineer: On-board Autonomy

Los Angeles, CA · On-site

$140K - $180K/yr

  • Medical

  • Dental

  • Vision

  • Retirement

  • PTO

Pay Range: * (E1) Junior Software Engineer: $120,000 - $145,000 / year * (E2) Software Engineer: $140,000 - $180,000 / year * (E3) Senior Software Engineer: Competitive * Meaningful equity incentives ...

Wsgr

Senior Software Developer

Los Angeles, CA · On-site +1

$147K - $198K/yr

The software developers on our team are the primary contributors to Neuron on both the frontend and the backend. You will work closely with a fully remote team of designers, developers, and ...

Observable Space

Junior Embedded Software Engineer

Los Angeles, CA · On-site

$141K - $186K/yr

  • Medical

  • Dental

  • Vision

  • PTO

Junior Embedded Software Engineer Location: Los Angeles, CA About Observable Space At Observable ... and developer-friendly APIs into world class products. From advanced ground stations, on orbit ...

Technology Company

Be Seen First

Senior Full Stack Software Engineer

Los Angeles, CA · Remote

  • Medical

  • Dental

  • Vision

  • Life

  • Retirement

... Software Developer * Experience designing interactive applications * Excellent knowledge of .NET, C#, MS SQL Server, Full-Stack Web Development, ASPX, MVC, JQuery, Angular and Web Services

General Matter

Software Engineer

Los Angeles, CA · On-site

$100K/yr

  • Medical

  • Dental

  • Vision

  • Retirement

Mentor junior and mid-level engineers while driving independent progress on complex, ambiguous ... Comfort across the full software development lifecycle, from design through deployment Additional ...

The Walt Disney Company

Sr Software Engineer

Glendale, CA

$135K - $181K/yr

Job Posting Title: Sr Software Engineer Req ID: 10149383 At Disney "We Power the Magic!" That's our ... Mentor junior or contracted engineers and foster a culture of innovation, inclusion, and technical ...

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All JobsSoftware Developer JobsJunior Software Developer JobsJunior Software Developer Jobs in Simi Valley, CA

Junior Software Developer information

See Simi Valley, CA salary details

$24.8K

$91.8K

$141.9K

How much do junior software developer jobs pay per year?

As of Aug 13, 2026, the average yearly pay for junior software developer in Simi Valley, CA is $91,849.00, according to ZipRecruiter salary data. Most workers in this role earn between $69,200.00 and $89,800.00 per year, depending on experience, location, and employer.

What are some typical challenges a junior software developer might face when starting out, and how can they overcome them?

Junior Software Developers often encounter challenges such as understanding large codebases, managing their time effectively between learning and delivering tasks, and adapting to new development tools or frameworks. To overcome these hurdles, it's helpful to actively seek guidance from more experienced team members, participate in code reviews, and make consistent use of documentation. Regular communication within the team and a willingness to ask questions can significantly speed up the learning process and help build confidence in your role.

What does a junior software developer do?

A junior software developer works on a development team writing and maintaining code for computer applications. As a junior software developer, your primary responsibilities are to learn the codebase, work on small bug fixes, and participate in paired programming with mid-level and senior developers. Junior software developers are entry-level positions, but as you gain experience and build up your programming skills, you will start to take on larger projects. Your job duties include attending and contributing to development team meetings, troubleshooting, patching computer code, and collaborating with other developers to create applications.

What are the key skills and qualifications needed to thrive as a junior software developer, and why are they important?

To thrive as a Junior Software Developer, you need proficiency in programming languages (such as Python, Java, or JavaScript), algorithms, and problem-solving, often supported by a relevant degree or coding bootcamp experience. Familiarity with version control systems like Git, basic knowledge of databases, and experience with development frameworks are valuable technical assets. Strong communication, teamwork, and a willingness to learn help you adapt and contribute effectively in collaborative environments. These skills and qualities are essential for delivering reliable code, supporting team goals, and growing in a fast-evolving tech landscape.

What does a junior software developer do?

A Junior Software Developer is an entry-level professional who assists in designing, coding, testing, and maintaining software applications. They typically work under the supervision of more experienced developers and contribute to various stages of the software development lifecycle. Their responsibilities often include writing basic code, debugging, collaborating with team members, and learning new technologies to improve their skills. This role is a great starting point for individuals looking to build a career in software development.
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What are the most commonly searched types of Software Developer jobs in Simi Valley, CA?

The most popular types of Software Developer jobs in Simi Valley, CA are:

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For Junior Software Developer jobs in Simi Valley, CA, the most frequently searched job titles are:

What cities near Simi Valley, CA are hiring for Junior Software Developer jobs?

Cities near Simi Valley, CA with the most Junior Software Developer job openings:

Junior Software Developer jobs near you
Infographic showing various Junior Software Developer job openings in Simi Valley, CA as of August 2026, with employment types broken down into 84% Full Time, 13% Part Time, and 3% Contract. Highlights an 87% Physical, 3% Hybrid, and 10% Remote job distribution, with an average salary of $91,849 per year, or $44.2 per hour.

Software Engineer: State Estimation & Prediction

Lodestar

Los Angeles, CA • On-site

$135K - $170K/yr

Full-time

Medical, Dental, Vision, Retirement, PTO

Re-posted 22 days ago

Job description

About Lodestar
Lodestar's mission is to develop the first "Protect and Defend" capability for high-value space assets in orbit. Our flagship product MITHRIL is our hardware-agnostic, AI-enabled autonomy software suite that enables us to augment any off-the-shelf spacecraft with the ability to autonomously detect, characterise, and reversibly neutralise orbital threats. By building on the proven space heritage of our best-in-class satellite-bus partners and fully integrating MITHRIL into single unified platform, we deliver an end-to-end, autonomous in-space bodyguarding service.
About the Job
At Lodestar, as a Software Engineer: State Estimation & Prediction, you'll be leading the development of our state estimation and prediction models at the core of Lodestar's flagship product, MITHRIL. You'll be focusing on researching and developing algorithms that fuse probabilistic estimation with machine learning to track targets, predict trajectories and assess intent.
We proudly have an "extreme ownership" oriented engineering culture.
What You'll Do
  • Design and implement Lodestar's core state estimation and prediction architecture for autonomous spacecraft operations
  • Research and implement novel estimation and prediction algorithms - everything from lit. review, through training and tuning, to optimisation and deployment
  • Develop classical and neural estimators to track the current state and trajectory of multiple dynamic targets in real time
  • Create neural models to forecast future trajectories and behavioral patterns of targets
  • Implement intent inference models to identify actions and dynamically rank threat levels
  • Integrate state estimation and prediction models into mission simulation environments and autonomy decision systems
  • Collaborate with cross-functional teams including, perception, and on-board autonomy to ensure prediction fidelity, robustness, and scalability across missions
Basic Qualifications
  • Bachelor's or Master's degree in Computer Science, Aerospace, Robotics, Applied Mathematics, a related field, or equivalent experience
  • 2+ years of distinguished industry experience in state estimation, aerospace, robotics, or a related field
  • Strong proficiency in C++ and Python
  • Demonstrated experience with probabilistic state estimation (Kalman filters, particle filters, Bayesian inference)
  • Experience with deep learning frameworks (PyTorch, TensorFlow) for sequence modeling (seq2seq, RNNs, LSTMs, Transformers)
  • Familiarity with trajectory modeling, multi-body dynamics, or orbital mechanics
Preferred Skills & Experience
  • Track record implementing state estimation pipelines in real-time or safety-critical systems
  • Experience deploying sequence-to-sequence models for forecasting in dynamic environments
  • Familiarity with sensor fusion techniques (e.g., combining radar, optical, and inertial data)
  • Proficiency with GPU acceleration (CUDA, TensorRT) for neural network training and inference
  • Experience with Linux, Git, and CI/CD pipelines
  • Comfortable with containerization tools such as Docker and Kubernetes
  • Familiarity with real-time systems, multi-threading, and performance optimization
  • Strong understanding of networking and communication protocols for distributed autonomy systems
ITAR Requirements
To conform to U.S. Government space technology export regulations, including the International Traffic in Arms Regulations (ITAR) you must be a U.S. citizen, lawful permanent resident of the U.S., protected individual as defined by 8 U.S.C. 1324b(a)(3), or eligible to obtain the required authorizations from the U.S. Department of State. Learn more about the ITAR here.
Compensation & Benefits
  • Pay Range:
    • (E1) Junior Software Engineer: $120,000 - $140,000 / year
    • (E2) Software Engineer: $135,000 - $170,000 / year
    • (E3) Senior Software Engineer: Competitive
  • Meaningful equity incentives as part of our employee option pool
  • Flexible PTO with generous paid vacation, holidays, and sick leave
  • Comprehensive medical, dental & vision coverage
  • 401(k) retirement plan with company match
  • LA
Additional Information
Compensation bands are determined by role, level, location, and alignment with market data. Individual level and base pay is determined on a case-by-case basis and may vary based on job-related skills, education, experience, technical capabilities and internal equity. In addition to base salary, for full-time hires, you may also be eligible for long-term incentives, in the form of stock options , and access to medical, vision and dental coverage, as well as access to a 401(k) retirement plan.
Lodestar is an Equal Opportunity Employer; employment with Lodestar is governed on the basis of merit, competence and qualifications and will not be influenced in any manner by race, color, religion, gender, national origin/ethnicity, veteran status, disability status, age, sexual orientation, gender identity, marital status, mental or physical disability or any other legally protected status.

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