Top Product Development Companies in California

Discover top product development companies in California. Compare reviewed agencies, portfolios, pricing, and services to hire the best Product Developers for your project.
...Read Full Description
Review Star Image Review Star Image Review Star Image Review Star Image Review Star Image
4.9 out of 5, based on 222 real reviews.
info-icon

SelectedFirms reviews agencies and verifies client feedback to support informed decisions. [How SelectedFirms Ensures Trust]

Explore Reviewed Product Development Companies in California — Find Skilled Product Developers for Your Project

Certain agencies may be featured through sponsored placements. Rankings and SF Scores remain unbiased and are based solely on our evaluation methodology.

60 Companies

Filter by

  • USA

    close
  • California

    close

16

SF Score

SF Score is calculated using our SARM methodology to evaluate agency expertise, market presence, and overall credibility. View Ranking Methodology

16

SF Score

SF Score is calculated using our SARM methodology to evaluate agency expertise, market presence, and overall credibility. View Ranking Methodology

View Profile Visit Website
Services Provided
info
Expertise Distribution (%)
  • 5% Product Engineering services

  • 10% Ecommerce Development

  • 10% Mobile App Development

  • 10% Software Development

  • 10% Web Development

  • 10% Web Design

  • 10% Internet of Things

  • 10% Artificial Intelligence

  • 5% Cloud Computing Services

  • 5% CMS

  • 5% Digital Marketing

  • 5% IT Services

  • 5% Digital Transformation

Setting the Standard for Staff Augmentation and IT Solutions

Cyber InfraStructure INC. (CIS), founded in 2003, is a global IT consulting and staff augmentation leader with offices in Central India, the USA, and the UK. We specialize in delivering top-tier technology solutions, helping businesses scale their teams and optimize operations efficiently. With experience serving over 2,100 clients across 100+ countries, we support industries including education, finance, travel, retail, manufacturing, gaming, and healthcare. CIS is recognized for excellence, holding CMMI Level 3, ISO 9001:2018 certifications, and partnerships such as Microsoft Gold Partner, Magento Silver Solution Partner, and memberships with Drupal and Joomla. Our focus is delivering innovative, reliable IT solutions that drive measurable business results.

View CIS Profile
Inside Service Listing

< $25/hr

Hourly Rate
Inside Service Listing

$10,000+

Min. Budget Size
Inside Service Listing

250 - 999

Team size
Inside Service Listing

San Jose, USA

Location

12

SF Score

SF Score is calculated using our SARM methodology to evaluate agency expertise, market presence, and overall credibility. View Ranking Methodology

12

SF Score

SF Score is calculated using our SARM methodology to evaluate agency expertise, market presence, and overall credibility. View Ranking Methodology

View Profile Visit Website
Services Provided
info
Expertise Distribution (%)
  • 100% Product Engineering services

What we make makes a difference.

Sanmina is a designated technical engineering group that specializes in structural mechanical prototyping, customized circuit board configurations, and robust rapid physical validation environments. Working primarily with consumer instrumentation, industrial computing setups, and automated frameworks, they validate critical layouts and eliminate technical integration risks before commercial tooling runs commence. Their engineering division ensures thorough quality compliance checks, detailed component diagnostics, and scalable design iterations.

View Sanmina Profile
Inside Service Listing

$100-$149/hr

Hourly Rate
Inside Service Listing

$25,000+

Min. Budget Size
Inside Service Listing

50 - 249

Team size
Inside Service Listing

San Jose, USA

Location

12

SF Score

SF Score is calculated using our SARM methodology to evaluate agency expertise, market presence, and overall credibility. View Ranking Methodology

12

SF Score

SF Score is calculated using our SARM methodology to evaluate agency expertise, market presence, and overall credibility. View Ranking Methodology

View Profile Visit Website
Services Provided
info
Expertise Distribution (%)
  • 100% Product Engineering services

Accelerating Hardware Innovation from Idea to Scale

Product Realization Group (PRG) provides structured product engineering, rapid prototype development, and strategic supply chain management services for tech businesses and medical device manufacturers. The consultancy operates an ecosystem of specialized engineering professionals, focusing heavily on functional hardware prototyping, comprehensive regulatory compliance audits, and initial proof-of-concept testing loops. PRG excels at guiding product development teams through complex engineering documentation, helping them manage early manufacturing risks and clear strict regulatory hurdles like FDA or CE certifications. Their collaborative prototyping framework pairs high-level system architecture with hands-on mechanical and electrical component validation, ensuring that early MVP builds are scalable. By optimizing component procurement paths and setting up testing frameworks during early development, PRG accelerates the journey from a validated prototype to full market launch.

View Product Realization Group Profile
Inside Service Listing

N/A

Hourly Rate
Inside Service Listing

$1,000+

Min. Budget Size
Inside Service Listing

10 - 49

Team size
Inside Service Listing

Menlo Park, USA

Location

12

SF Score

SF Score is calculated using our SARM methodology to evaluate agency expertise, market presence, and overall credibility. View Ranking Methodology

12

SF Score

SF Score is calculated using our SARM methodology to evaluate agency expertise, market presence, and overall credibility. View Ranking Methodology

View Profile Visit Website
Services Provided
info
Expertise Distribution (%)
  • 100% Product Engineering services

Build the right product

PCH International is a global product development and manufacturing company specializing in hardware prototyping, product engineering, and new product introduction services. The company helps startups and enterprises accelerate innovation through rapid prototyping, supply chain engineering, industrial design support, and manufacturing readiness. PCH works extensively with consumer electronics, IoT devices, and connected hardware products, enabling businesses to validate concepts and scale production efficiently. Their engineering ecosystem supports MVP creation, proof-of-concept development, and hardware commercialization for emerging technology companies. The company combines product engineering expertise with global manufacturing capabilities to reduce product development risks and optimize go-to-market execution.

View PCH International Profile
Inside Service Listing

N/A

Hourly Rate
Inside Service Listing

$50,000+

Min. Budget Size
Inside Service Listing

250 - 999

Team size
Inside Service Listing

San Francisco, USA

Location
DigitalMonk
Review Star Image Review Star Image Review Star Image Review Star Image Review Star Image
agency_climbed
Claimed by Official Representatives

12

SF Score

SF Score is calculated using our SARM methodology to evaluate agency expertise, market presence, and overall credibility. View Ranking Methodology

12

SF Score

SF Score is calculated using our SARM methodology to evaluate agency expertise, market presence, and overall credibility. View Ranking Methodology

View Profile Visit Website
Services Provided
info
Expertise Distribution (%)
  • 20% Product Engineering services

  • 40% Internet of Things

  • 20% Software Development

  • 10% Mobile App Development

  • 10% IT Services

Monks makes everything better

DigitalMonk is a dynamic technology company specializing in innovative digital solutions, empowering businesses through cutting-edge services in web development, IoT, AI, and embedded systems. At DigitalMonk, we offer tailored tech solutions like embedded software development, IoT-based systems, and AI (chatbots and automation), along with web development and digital marketing services. Our services: 1. Embedded Software Development Services 2. Custom Vending Solutions 3. Custom Arcade Game Software Development 4. Chatbot Development Services 5. Hire Next.js Developer 6. Custom Photo booth software

View DigitalMonk Profile
Inside Service Listing

$50-$99/hr

Hourly Rate
Inside Service Listing

$2,000 - $5,000

Min. Budget Size
Inside Service Listing

30 - 50

Team size
Inside Service Listing

Alpine, USA

Location
Radixiy Inc.
Review Star Image Review Star Image Review Star Image Review Star Image Review Star Image
agency_climbed
Claimed by Official Representatives

12

SF Score

SF Score is calculated using our SARM methodology to evaluate agency expertise, market presence, and overall credibility. View Ranking Methodology

12

SF Score

SF Score is calculated using our SARM methodology to evaluate agency expertise, market presence, and overall credibility. View Ranking Methodology

View Profile Visit Website
Services Provided
info
Expertise Distribution (%)
  • 20% Product Engineering services

  • 20% Software Development

  • 20% IT Services

  • 20% Artificial Intelligence

  • 10% Mobile App Development

  • 10% Cloud Computing Services

Technology Service Provider/ SaaS / Custom Web Development/Cloud Solutions/MDM/Databricks

Radixiy is not just an Information Technology (IT) provider; we are strategic and versatile partners in digital transformation. With over a decade of experience and a team of certified experts, we deliver software solutions that are reliable, resilient, and scalable. At Radixiy, we don’t just write code; we build reliable, resilient, scalable, and intelligent software solutions that power business transformation. Our tech-first mindset, agile approach, and deep industry experience make us the trusted partner for startups, governments, and enterprises alike. With a team of experienced IT professionals, we deliver tailored solutions that ensure scalability, compliance, and long-term value. Core Technical Domains Custom Software Development: End-to-end engineering of digital products, including SaaS platforms and enterprise applications/web platforms, API design & systems integration, Microservices architecture, Backend engineering & optimization and Secure, compliant application development. Cloud-Native Architecture: Designing scalable, high-availability systems with a strong focus on auto-scaling, load balancing, and fault tolerance. DevSecOps & Security: Implementation of secure SDLC, identity and access management (IAM), and compliance with global standards like GDPR and ISO 27001. Infrastructure as Code (IaC): Automating environment provisioning and management using tools such as Terraform, CloudFormation, or Deployment Manager. Specialized Platforms Cloud Infrastructure: Expert-level mastery of AWS (Amazon Web Services), Google Cloud Platform (GCP), and Microsoft Azure. Web Platforms: Full-stack development focusing on modern frameworks and responsive design. Containerization & Orchestration: Heavy use of Kubernetes and Docker for deploying microservices. Database Systems: Management of distributed and managed databases such as Oracle, PostgreSQL, MySQL, MariaDB, NoSQL (MongoDB), etc. Support & Maintenance Radixiy’s support and maintenance services are not just an "afterthought" or a helpdesk; they are an extension of their 3R philosophy. IT Strategy & Planning IT Roadmap & Strategic Planning Enterprise Architecture Consulting Technology roadmap development aligned with business objectives. Digital transformation and modernization strategies. IT governance, risk management, and compliance planning & PMO advisory IT Project Management & Implementation CTO / CIO Advisory Services Business Process Optimization Cloud / Infrastructure / DevOps Cloud readiness assessments and migration support (AWS, Azure, Google Cloud). Network architecture and optimization. Server and storage consolidation strategies. Security First Architecture Cost Optimization DevOps, CI/CD, GitOps & Agile Software Delivery Monitoring & Observability Managed Cloud Operations Application & Systems Consulting Enterprise Resource Planning (ERP) system evaluation and support. Software selection and vendor management. Legacy system modernization. Custom Application/Software, Development, SaaS Product Software Architecture & System Integration API Development & Integration, Middleware development, Workflow Automation System Integration Services QA & Test Automation Data Management & Analytics Data Warehouse, Data Engineering Data governance, quality and architecture. Business Intelligence (BI) dashboards and custom reporting. Data privacy and compliance (GDPR, CCPA) Predictive Analytics Dashboard Development Real-Time Analytics Big Data Processing AI / ML Solutions NLP & Conversational AI Training, Support & Maintenance Managed IT Services Application, Software and Infrastructure Support Cybersecurity & Risk Management 24/7 Monitoring and SLA based support Integration & Cloud Support Security Compliance Upgrade, Patch and Security Management IT helpdesk design and process optimization. Employee training on cybersecurity awareness, tools, and workflows. Knowledge transfer to internal teams. Cybersecurity & Risk Management Cybersecurity Consulting Security posture assessments and Vulnerability Assessment & Penetration testing. Policy development and compliance with industry standards (NIST, ISO 27001, HIPAA, CCPA). Implementation of security tools (SIEM,XDR, MFA, endpoint protection). Incident response and disaster recovery planning. Data Protection & Encryption Security Monitoring & Incident Response

View Radixiy Inc. Profile
Inside Service Listing

$100-$149/hr

Hourly Rate
Inside Service Listing

$50,000+

Min. Budget Size
Inside Service Listing

10 - 49

Team size
Inside Service Listing

San Jose, USA

Location

6

SF Score

SF Score is calculated using our SARM methodology to evaluate agency expertise, market presence, and overall credibility. View Ranking Methodology

6

SF Score

SF Score is calculated using our SARM methodology to evaluate agency expertise, market presence, and overall credibility. View Ranking Methodology

View Profile Visit Website
Services Provided
info
Expertise Distribution (%)
  • 50% Product Engineering services

  • 50% IT Services

Turning complex technology into commercial reality.

Gener8 is a designated technical engineering group that specializes in structural mechanical prototyping, customized circuit board configurations, and robust rapid physical validation environments. Working primarily with consumer instrumentation, industrial computing setups, and automated frameworks, they validate critical layouts and eliminate technical integration risks before commercial tooling runs commence. Their engineering division ensures thorough quality compliance checks, detailed component diagnostics, and scalable design iterations.

View Gener8 Profile
Inside Service Listing

$100-$149/hr

Hourly Rate
Inside Service Listing

$25,000+

Min. Budget Size
Inside Service Listing

50 - 249

Team size
Inside Service Listing

San Jose, USA

Location

5

SF Score

SF Score is calculated using our SARM methodology to evaluate agency expertise, market presence, and overall credibility. View Ranking Methodology

5

SF Score

SF Score is calculated using our SARM methodology to evaluate agency expertise, market presence, and overall credibility. View Ranking Methodology

View Profile Visit Website
Services Provided
info
Expertise Distribution (%)
  • 40% Product Engineering services

  • 40% Web Design

  • 20% Digital Marketing

Creating iconic products that transform industries.

Whipsaw is a critically acclaimed industrial design and engineering consultancy specializing in premium rapid physical prototyping and functional electronic mockups. The studio systematically constructs architectural physical components, medical device interfaces, and consumer tech systems to validate conceptual viability. Their integrated team handles full product engineering pathways, aligning detailed user feedback loops with rigorous mechanical stress tests prior to commercial casting stages.

View Whipsaw Profile
Inside Service Listing

/hr

Hourly Rate
Inside Service Listing

$75,000+

Min. Budget Size
Inside Service Listing

10 - 49

Team size
Inside Service Listing

San Francisco, USA

Location

2

SF Score

SF Score is calculated using our SARM methodology to evaluate agency expertise, market presence, and overall credibility. View Ranking Methodology

2

SF Score

SF Score is calculated using our SARM methodology to evaluate agency expertise, market presence, and overall credibility. View Ranking Methodology

View Profile Visit Website
Services Provided
info
Expertise Distribution (%)
  • 20% Product Engineering services

  • 20% Mobile App Development

  • 20% Web Development

  • 20% Web Design

  • 10% Digital Marketing

  • 10% Digital Transformation

We build brands and products that rethink sports

This LA-based software and branding agency is uniquely positioned at the intersection of technology and the sports industry, partnering with elite brands including the LA Dodgers, Diamond Kinetics, EL1, PWHL, and Epicore Biosystems. Specializing in product and brand strategy, high-performance marketing websites, and native mobile development, the agency delivers digital experiences built specifically for the demands of sports organizations, sports tech companies, and performance brands. With a deep understanding of athlete-focused technology and fan engagement platforms, their team brings category-specific expertise that generic agencies simply cannot replicate. For sports brands seeking a technology partner who understands the industry from the inside, this studio offers an unmatched combination of technical capability and domain credibility.

View Robin Profile
Inside Service Listing

$150-$199/hr

Hourly Rate
Inside Service Listing

$50,000+

Min. Budget Size
Inside Service Listing

10 - 49

Team size
Inside Service Listing

Los Angeles, USA

Location

2

SF Score

SF Score is calculated using our SARM methodology to evaluate agency expertise, market presence, and overall credibility. View Ranking Methodology

2

SF Score

SF Score is calculated using our SARM methodology to evaluate agency expertise, market presence, and overall credibility. View Ranking Methodology

View Profile Visit Website
Services Provided
info
Expertise Distribution (%)
  • 20% Product Engineering services

  • 20% Artificial Intelligence

  • 20% Internet of Things

  • 20% Mobile App Development

  • 10% Cloud Computing Services

  • 10% Web Design

Humanizing technology

RKS Design is a California-based product development and industrial design consultancy delivering innovative prototyping and engineering services for global brands. The company provides industrial design, user experience design, product strategy, engineering validation, and rapid prototyping services across healthcare, consumer electronics, and mobility industries. RKS Design uses human-centered design methodologies to help organizations create functional, scalable, and emotionally engaging products. Their teams support businesses through concept development, MVP engineering, manufacturing planning, and commercialization. The company focuses on innovation strategies that improve usability, market differentiation, and long-term product success.

View RKS Design Profile
Inside Service Listing

$150-$199/hr

Hourly Rate
Inside Service Listing

$50,000+

Min. Budget Size
Inside Service Listing

50 - 249

Team size
Inside Service Listing

Thousand Oaks, USA

Location
Pagination
1
2
Pagination

Why Companies Trust SelectedFirms?

SelectedFirms bridges the gap between businesses and digital service providers as a trusted B2B research and listing platform. With the trust of 14,000+ companies and a growing community of 1M+ users, we empower businesses with reliable insights to make confident decisions.

why_companies_trust_sf_1

Human-verified companies

We manually review companies to ensure they meet our quality standards before they appear on the platform.

why_companies_trust_sf_2

Research-driven rankings

We rank companies using a clear ranking methodology based on real client feedback, expertise, market credibility, and how well teams execute — not hype.

why_companies_trust_sf_3

Always up-to-date insights

We regularly refresh listings with new reviews, case study updates, and market changes to keep decisions relevant.

why_companies_trust_sf_4

Verified credibility signals

From verified badges to editorial reviews, we highlight companies that show real commitment to quality and transparency.