Junior Software Programmer Jobs in Simi Valley, CA

At Re:Build, our mission is to ensure the next generation of important products are made, at scale, in America. We are laying the foundation for a better future for our customers, employees, and communities by revitalizing America's manufacturing base and creating meaningful jobs across the country, including in historically deindustrialized regions.

We operate an advanced, end-to-end manufacturing platform that partners with industrial companies and innovators to take products from first concept to full-scale production in critical verticals including aerospace and defense, electrification, medical, energy and environment, and robotics and automation.

The way we operate is as important as the work we do. It's guided by The Re:Build Way, 16 principles that shape how we collaborate with each other, partner with our customers and vendors, and contribute to the communities where we operate. (link to The Re:Build Way principles)

The Senior Software Engineer is a key technical contributor who designs, develops, and scales cloud-native software solutions that power Re:Build's digital platforms. In line with The Re:Build Way, this role combines deep hands-on engineering with thoughtful architectural influence, emphasizing ownership, accountability, and long-term system health.

You will collaborate closely with product, design, and cross-functional engineering partners, working in a candid and respectful manner to solve real business problems. You bring a practical, outcome-driven mindset to innovation, thoughtfully integrating emerging technologies such as AI/ML where they add measurable value, and delivering high-quality software that balances speed, reliability, and maintainability.

The ideal candidate thrives in complex environments, approaches challenges with curiosity and discipline, and holds themselves and others to high engineering standards. You champion clean, efficient, and testable code, actively participate in code reviews, and contribute to team growth through mentorship and knowledge sharing. Guided by a mindset of continuous improvement, you stay current with industry trends and help shape Re:Build's technology roadmap-ensuring our systems remain scalable, secure, and built to endure.

• Lead the design and architecture of software systems, ensuring scalability, reliability, and high performance.
• Solve complex technical challenges and optimize system performance through innovative solutions.
• Mentor and guide junior engineers, providing technical leadership and direction to help them grow.
• Ability to write and maintain technical documentation.
• Collaborate with cross-functional teams, including product, QA, and operations, to drive product development and ensure successful delivery
• Adhere to Best Practices with company software

Experience

• 7+ years' experience developing professional software, with a solid understanding of cloud-based application development.

Programming & Frameworks 

• Strong full-stack development expertise with modern backend technologies and frontend frameworks (especially React/TypeScript), with demonstrated ability to build scalable, accessible, high-performance web applications across diverse technology stacks.

Cloud & Infrastructure

• Strong experience architecting and deploying cloud-native, serverless, and containerized applications on AWS (Lambda, ECS, DynamoDB, S3, Step Functions, API Gateway, Fargate).

AI/ML Integration

• Proven experience architecting RAG systems leveraging LLMs, vector databases, embeddings, and semantic search, with expertise in prompt engineering, document processing, retrieval optimization, and production deployment.

APIs & Integration

• Proficiency in designing and working with RESTful and GraphQL APIs.

Security & Compliance

• Awareness of authentication, authorization, encryption, and compliance best practices for cloud-hosted applications.

Foundational Knowledge

Agile Practices

• Hands-on experience participating in Agile ceremonies such as sprint planning, retrospectives, and cross-team collaboration.

• Brings enthusiasm, optimism, and a can-do attitude to every project.
• Leads by example-mentors junior developers, supports peers, and takes ownership of key technical decisions with confidence and humility.
• Analytical and inventive, able to break down complex technical challenges and design innovative, efficient solutions.
• Adaptable and resilient, skilled at navigating shifting priorities, new technologies, and evolving business needs.
• Communicates clearly and thoughtfully, fostering trust and alignment across teams.
• Highly organized, focused, and effective in fast-paced, dynamic environments.
• Exhibits strong problem-solving skills with consistent attention to detail and quality.
• A collaborative teammate who works seamlessly across engineering, management, and cross-functional partners.

•  We are seeking candidates who currently reside in the Seattle, WA or Los Angeles, CA metropolitan areas.
•  Quarterly travel to our downtown Los Angeles office is required.

Export Control Requirement: Due to applicable export control laws and regulations, candidates must be a U.S. citizen or national, U.S. permanent resident (i.e., current Green Card holder), or lawfully admitted into the U.S. as a refugee or granted asylum.

The base salary range for this position is $143,000-$214,000 per year. This range represents the Company's good faith estimate of the base compensation for this role at the time of posting.  Actual compensation will be determined based on several factors, including but not limited to relevant experience, skills, qualifications, internal equity, and geographic location. In addition to base salary, this role may be eligible for annual incentive compensation and/or long-term incentives, subject to Company plans. The Company offers a comprehensive benefits package including medical, dental, vision, retirement, paid time off, and other benefits.

The BIG payoff

We are a company who is going to make a difference in the industries and the communities in which we choose to operate.

Every employee of Re:Build will share ownership in the company and will share in the financial rewards of the success we achieve together, at all levels of the company!

We want to work with people that reflect the communities in which we operate

Re:Build Manufacturing is proud to be an Equal Employment Opportunity and Affirmative Action employer. We do not discriminate based upon race, color, religion, gender, gender identity or expression, sexual orientation, national origin, genetics, disability, age, veteran status, marital status, parental status, cultural background, organizational level, work styles, tenure and life experiences. Or for any other reason.

Re:Build is committed to providing reasonable accommodations for qualified individuals with disabilities in our job application procedures. If you need assistance or an accommodation due to a disability, you may contact us at accommodations.ta@ReBuildmanufacturing.com or you may call us at 617.909.6275.