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Freelance Integration Software Engineer Jobs (NOW HIRING)

INTRUST Bank

Senior Integration Software Engineer

Wichita, KS · On-site

$93K - $125.20K/yr

Substantial proficiency as a software developer with a proven track record of delivering complex integration and data solutions. Expertise in working with SQL databases and data modeling concepts.

INTRUST Bank

Senior Integration Software Engineer

Wichita, KS · On-site

$93K - $125.20K/yr

Substantial proficiency as a software developer with a proven track record of delivering complex integration and data solutions. Expertise in working with SQL databases and data modeling concepts.

asrcfh

Software Integration & Test Engineer

Moorestown, NJ

$102.50K - $138K/yr

The Software Integration & Test Engineer supports system-level software integration within a laboratory environment. This role executes requirement-driven manual and automated integration testing ...

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How much do freelance integration software engineer jobs pay per year?

As of May 29, 2026, the average yearly pay for freelance integration software engineer in the United States is $124,275.00, according to ZipRecruiter salary data. Most workers in this role earn between $104,000.00 and $140,000.00 per year, depending on experience, location, and employer.

What are the key skills and qualifications needed to thrive as a Freelance Integration Software Engineer, and why are they important?

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 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 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.

More about Freelance Integration Software Engineer jobs
What cities are hiring for Freelance Integration Software Engineer jobs? Cities with the most Freelance Integration Software Engineer job openings:
What are the most commonly searched types of Integration Software Engineer jobs? The most popular types of Integration Software Engineer jobs are:
What states have the most Freelance Integration Software Engineer jobs? States with the most job openings for Freelance Integration Software Engineer jobs include:
What job categories do people searching Freelance Integration Software Engineer jobs look for? The top searched job categories for Freelance Integration Software Engineer jobs are:
Freelance Integration Software Engineer jobs near you
Infographic showing various Freelance Integration Software Engineer job openings in the United States as of May 2026, with employment types broken down into 90% Full Time, 4% Part Time, 1% Temporary, and 5% Contract. Highlights an 10% Physical, 27% Hybrid, and 63% Remote job distribution, with an average salary of $124,275 per year, or $59.7 per hour.

Integration Software Engineer

The Hiring Group, LLC

Greenville, SC

$97.80K - $131.60K/yr

Contractor

Medical, Dental, Vision, Retirement, PTO

Posted 17 days ago

Job description

The Need:

Our client is looking for a qualified full-time Integration Software Engineer to help facilitate both the ongoing support of existing systems as well as system upgrades and integration for new systems.

This support is needed starting immediately and does not have a planned end date. The position will be reassessed on a regular basis. 

Location: Greenville, SC (Onsite)
Contract: LTC - Initial 1-Year term with right to extend. CTH is not currenly in scope or this position.
Work Status: Must be authorized to work in the U.S. (US Citizen preferred or permanent resident Green Card) 

Work Schedule:

  • Normal work hours 40 hrs/ week Monday – Friday, however occasional shifts in schedules can be made to provide coverage for project installations and start-ups requiring weekend or holiday coverage.
  • Overtime work may be approved as needed but will not be typical.
  • Work schedules will vary based on project need and assignment.  
  • Up to 30% domestic and some international travel over a 12-month period
    • Projected breakdown
      • 60% are 1-week trips 
      • 20% to 30% are 2-week trips
      • 10% are 3-week trips (try not to do many trips this long)
      • Occasional emergency travel (corporate jet) once per year, if at all.
      • Vast majority of travel is given a 3 to 8-month notice.
      • Work around PTO/vacations

Who is the internal/external customer:

Internal users at 26 production manufacturing sites in the US, Canada and Mexico.

Size of group:

The Integration team consists of 11 people and includes: 1 Manager, 1 Team Lead, 1 Architect, 6 Developers, 1 Site Reliability Engineer.

Technical Environment: 

Currently these systems are predominantly Windows Servers running .NET Framework applications in C# application on with UI (user interfaces)  in either legacy ASP.Net or WPF with back-end Oracle Database.  These systems are deployed on VMware ESXi clusters on premise in datacenters at our facilities.  This model is moving towards a micro service architecture using containers on Kubernetes (K8) using .NET Core with UI in Blazer and database in PostgreSQL on VMware Tanzu.

Day-to-day job responsibilities:

  • Development or modification of manufacturing middleware 
  • Support related to software and interfacing with key users using Service Now
  • Daily team standups using Agile and use of Gitlab for software manage.
  • Collaboration with key individuals and team lead
  •  Documentation of processes, installation, and release notes
  • Work with SRE (Site Reliability Engineer) on observability of middleware/software

Must Have Requirements:

  1. Education: Computer science background (Computer Science degree or equivalent experience required) with 2-4+ years of experience in a production manufacturing setting.

  2. Computer skills

    • Languages: C#(.net)/Blazor and Java

    • Data: PostgreSQL and Oracle (Must understand Relational Databases

    • Infrastructure: Command of Windows/Linux, Kubernetes, and CI/CD Pipelines (Gitlab CI/CD)

  3. Methodology: Operates natively within Agile/Scrum Principles.

At The Hiring Group, our mission is to create a win-win situation for both our contractors and our clients, by focusing on the well-being of our contractor team. Our mantra is "Great Contractors Deserve Great Benefits." We provide our contractors with gold-level medical (employer paid at 50%), vision, and dental insurance, at least two weeks of PTO, 401k with employer match, training and development opportunities, and 24/7 dedicated consultant support. By investing in our contractors, we aim to increase employee retention, satisfaction, and productivity, which translates to increased value for our clients. We have been ranked several times on the Inc 5000 fastest-growing companies list, Best Places to Work in the U.S. by Inc Magazine, and Best Companies to Work for in South Carolina.

Please follow us on LinkedIn, Instagram, X, and Facebook.

Employment Type: CONTRACTOR

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