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Freelance Integration Software Engineer Jobs in California

Figure

Software Integration Engineer

San Jose, CA · On-site

$130K - $250K/yr

We're looking for a Software Integration Engineer to join our Systems Integration Team - the bridge between AI, Controls, Firmware, and Hardware. The team ensures that all components work cohesively ...

True Anomaly

Software Integration Engineer

Long Beach, CA · On-site

$113K - $152K/yr

As a Software Integration Engineer, you will work on the mission software stack to enhance mission success by solving technical challenges, leading architectural decisions, and ensuring code quality ...

Joby Aviation

Software Integration Engineer

Concord, CA

$95K - $150K/yr

Overview Joby's Flight Research group is looking for a skilled software integration engineer to play a pivotal role in the development and testing of cutting-edge flight automation systems. We're ...

Joby Aviation

Software Integration Engineer

Santa Cruz, CA · On-site

$95K - $150K/yr

Overview Joby's Flight Research group is looking for a skilled software integration engineer to play a pivotal role in the development and testing of cutting-edge flight automation systems. We're ...

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Freelance Integration Software Engineer information

What is the difference between Freelance Integration Software Engineer vs Freelance Software Developer?

AspectFreelance Integration Software EngineerFreelance Software Developer
Primary FocusDesigning and implementing system integrations and APIsDeveloping standalone applications or features
Required SkillsAPI development, system architecture, integration toolsProgramming languages, application development, UI/UX
Work EnvironmentClient sites, remote, collaborative with IT teamsRemote, independent, project-based
Common CertificationsAPI certifications, cloud platform credentialsProgramming language certifications, software development courses

Freelance Integration Software Engineers focus on connecting different systems and APIs, often working closely with IT teams. Freelance Software Developers create standalone applications or features. While both roles require programming skills, integration engineers emphasize system interoperability, whereas developers focus on application creation.

What are some common challenges a freelance integration software engineer might face when working with multiple clients?

Freelance Integration Software Engineers often encounter challenges such as managing different client expectations, working with diverse technology stacks, and aligning integration standards across various systems. Since each client may use unique tools and workflows, adaptability and strong communication skills are essential to ensure seamless integration. Additionally, coordinating with remote development teams and adhering to project timelines can be demanding, but these experiences also help build a versatile skill set and professional reputation.

What is a freelance integration software engineer?

A Freelance Integration Software Engineer is an independent professional who specializes in connecting and combining different software systems so they can work together seamlessly. They are typically hired on a project basis to develop, implement, and maintain integrations between applications, databases, APIs, and other digital services. These engineers ensure data flows smoothly across platforms, streamline business processes, and resolve compatibility issues. Freelancers in this role often work remotely and serve multiple clients across industries.

What are the key skills and qualifications needed to thrive as a freelance integration software engineer?

To thrive as a Freelance Integration Software Engineer, you need strong programming skills (often in languages like Java, Python, or JavaScript), experience with APIs, and a solid understanding of system integration concepts, typically backed by a degree in computer science or related field. Familiarity with integration platforms (such as MuleSoft, Dell Boomi, or Zapier), cloud services, and relevant certifications (like MuleSoft Certified Developer or AWS Certified Solutions Architect) is highly valuable. Excellent problem-solving, communication, and time-management skills help you collaborate with clients and efficiently deliver solutions in a freelance environment. These capabilities are essential to ensure seamless connectivity between systems, deliver high-quality client solutions, and manage projects independently.
What are the most commonly searched types of Integration Software Engineer jobs in California? The most popular types of Integration Software Engineer jobs in California are:
What are popular job titles related to Freelance Integration Software Engineer jobs in California? For Freelance Integration Software Engineer jobs in California, the most frequently searched job titles are:
What job categories do people searching Freelance Integration Software Engineer jobs in California look for? The top searched job categories for Freelance Integration Software Engineer jobs in California are:
Freelance Integration Software Engineer jobs near you
Infographic showing various Freelance Integration Software Engineer job openings in California as of August 2026, with employment types broken down into 50% Full Time, and 50% Contract. Highlights an 75% In-person, and 25% Remote job distribution.

Test Engineer, Vehicle Integration (Software)

Harbinger Motors Inc.

Garden Grove, CA • On-site

$105K - $141K/yr

Full-time

Posted 4 days ago

Job description

Test Engineer, Vehicle Integration (ECUs)

Job Overview

Harbinger is seeking a Software Integration & Test Engineer to serve as a key technical driver for our vehicle embedded systems and ADAS firmware. You will bridge the gap between software development and vehicle hardware, validating ECU communications, troubleshooting network issues, and ensuring the integrity of our software stacks on the vehicle platform. This role relies heavily on the Vector toolchain, network analysis, and calibration tools to ensure our medium-duty commercial electric vehicles perform flawlessly.

What You'll Do:

  • Software Validation & Integration: Integrate and validate software components across ECUs, sensors, and vehicle platforms, supporting SIL, HIL, and vehicle-level testing activities.

  • Network Simulation & Analysis: Use CANoe and CANalyzer to simulate ECU behavior, monitor bus traffic, and debug communication issues across CAN, CAN FD, and Automotive Ethernet networks.

  • Measurement & Calibration: Utilize CANape for real-time ECU calibration, XCP data measurement, and diagnostic flashing, while using vSignalyzer for comprehensive offline data analysis and visualization of measurement logs.

  • Deep Packet Inspection: Analyze logs, traces, and complex network captures using Wireshark to troubleshoot SOME/IP, DoIP, UDP, and TCP protocols on our vehicle ethernet networks.

  • Module Flashing & Configuration: Use RaptorCAL to program, calibrate, and manage parameter sets for Raptor-based and production vehicle control units.

  • Performance Optimization: Conduct CPU, memory, and task scheduling profiling to monitor and optimize software stack performance on embedded multi-core MCU/SoC platforms.

  • Root Cause Analysis: Act as a "black box" tester to concretely verify system performance, leveraging logs, traces, and replay systems to identify and resolve system-level bugs.

Who You Are (Qualifications):

  • Education: Bachelor's or Master's degree in Electrical Engineering, Computer Engineering, Computer Science, or a related field.

  • Experience: 3+ years of experience in automotive software integration, HIL/SIL testing, or embedded firmware validation.

  • Tool Proficiency: Proven hands-on experience with the Vector toolchain (CANoe, CANape, CANalyzer, vSignalyzer) for measurement, calibration, and simulation.

  • Network Diagnostics: Strong proficiency with Wireshark, tcpdump, and automotive protocols including CAN, CAN FD, Automotive Ethernet, UDS, and XCP.

  • Calibration Experience: Familiarity with model-based control tools and flashing/calibration software like RaptorCAL.

  • Software Skills: Strong proficiency in Python and C/C++ for developing test automation frameworks and scripting. Experience with Embedded Linux development and ROS2/DDS middleware is a strong plus.

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