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Senior Software Developer Jobs in Freeport, IL (NOW HIRING)

Colony Brands, Inc.

Software Developer 2

Monroe, WI · On-site

As a Software Developer on our Retail Commerce team, you'll work closely with product owners, stakeholders, and other talented developers to design and implement solutions that push the boundaries of ...

SC Data Center, Inc.

Software Developer

Monroe, WI · On-site

SC Data Center, Inc. is a rapidly evolving technology company that supports a diverse set of technology stacks for Colony Brands, Inc. Colony Brands is one of North America's largest multi-channel ...

Belcan

Software Engineer

Rockford, IL

$83K - $104K/yr

A Software Engineer job in Rockford, IL is currently available through Belcan at one of our key aerospace clients. We are seeking a highly motivated Software Engineer with a focus on Linux Simulation ...

Lean Synergy Solutions

Software Engineer

Rockford, IL

$80K - $120K/yr

Software Engineer Position Summary We are seeking a talented Software Engineer to join a ... The ideal candidate is a strong C++ developer with excellent analytical skills and an interest in ...

Harris

Senior Mobile Developer

Oregon, IL

$125K - $135K/yr

... software architecture aligns with business goals and industry best practices. - Solve complex ... Requirements: - Bachelor's degree or Diploma in Computer Science, Engineering, related field, or ...

Comply365

Senior Mobile Software Engineer - iOS

Beloit, WI · On-site

$132K/yr

... a Senior Mobile Software Engineer (iOS) with strong Swift and Objective-C expertise to help drive ... Stay up to date on the latest iOS SDK changes, frameworks, and Apple developer tools. * Mentor ...

Vistair

Senior Mobile Software Engineer - iOS

Beloit, WI · Hybrid

$132K/yr

About the role We're seeking a Senior Mobile Software Engineer (iOS) with strong Swift and ... Stay up to date on the latest iOS SDK changes, frameworks, and Apple developer tools. * Mentor ...

Comply365

Senior Mobile Software Engineer iOS

Beloit, WI · On-site

$132K/yr

About the role Were seeking a Senior Mobile Software Engineer (iOS) with strong Swift and ... Stay up to date on the latest iOS SDK changes, frameworks, and Apple developer tools. * Mentor ...

Harris

Software Engineer

Oregon, IL

$80K - $90K/yr

Requirements: - Bachelor's degree or Diploma in Computer Science, Engineering, related field, or equivalent work experience. - 3+ years of experience in software development, with proficiency in one ...

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All JobsSoftware Developer JobsSenior Software Developer JobsSenior Software Developer Jobs in Freeport, IL

Senior Software Developer information

See Freeport, IL salary details

$14

$58

$82

How much do senior software developer jobs pay per hour?

As of Jul 26, 2026, the average hourly pay for senior software developer in Freeport, IL is $58.03, according to ZipRecruiter salary data. Most workers in this role earn between $49.28 and $65.10 per hour, depending on experience, location, and employer.

What are the key skills and qualifications needed to thrive as a Senior Software Developer, and why are they important?

To thrive as a Senior Software Developer, you need deep expertise in programming languages, software architecture, and problem-solving, typically backed by a bachelor’s degree in computer science or a related field. Proficiency with development frameworks, version control systems like Git, and cloud platforms such as AWS or Azure is standard, and certifications in these areas can be beneficial. Leadership, strong communication, and mentoring abilities set standout candidates apart in this role. These skills ensure that complex projects are delivered efficiently, code quality is maintained, and junior team members are effectively guided for overall team success.

What Is a Senior Software Developer?

Senior software developers have several years of experience in the software industry. They have proven successful in exceeding client expectations when developing programs and have provided excellent support in the managing of those applications. They have worked their way up from junior software developer positions and have mastered a variety of coding languages and programs. Senior software developers train and oversee a team of junior software developers.

What kinds of projects and responsibilities can a Senior Software Developer expect to handle on a daily basis?

As a Senior Software Developer, you’ll typically be responsible for leading complex development projects, designing technical solutions, and mentoring junior team members. Daily tasks often include writing and reviewing code, participating in architecture discussions, collaborating with cross-functional teams (such as QA, product management, and DevOps), and troubleshooting high-level technical issues. You may also be involved in setting coding standards, conducting code reviews, and helping to plan sprints or project roadmaps.

What are Senior Software Developers?

Senior Software Developers are experienced professionals who design, develop, and maintain complex software applications. They often lead development teams, mentor junior developers, and make critical architectural decisions. Their responsibilities include writing high-quality code, troubleshooting technical issues, and ensuring that software projects meet performance and security standards. With deep expertise in programming languages and software engineering principles, they play a key role in delivering successful technology solutions for organizations.

What is the difference between Senior Software Developer vs Software Engineer?

AspectSenior Software DeveloperSoftware Engineer
CredentialsBachelor's degree in CS or related field; experience often 5+ yearsBachelor's or higher in CS or related field; similar experience levels
Work EnvironmentCollaborates on complex projects, mentors juniors, leads technical effortsDesigns, develops, tests software; may work on specific modules or systems
Industry UsageCommonly used in tech companies, startups, and enterprise firmsWidely used across industries, often interchangeable with developer roles

The main difference is that Senior Software Developers typically have more experience, leadership responsibilities, and focus on complex project oversight, while Software Engineers may focus more on designing and implementing software solutions. Both roles require similar credentials and are integral in software development teams, but Senior Software Developers often take on mentorship and strategic tasks.

More about Senior Software Developer jobs
What are popular job titles related to Senior Software Developer jobs in Freeport, IL? For Senior Software Developer jobs in Freeport, IL, the most frequently searched job titles are:
What cities near Freeport, IL are hiring for Senior Software Developer jobs? Cities near Freeport, IL with the most Senior Software Developer job openings:
Senior Software Developer jobs near you
Infographic showing various Senior Software Developer job openings in Freeport, IL as of July 2026, with employment types broken down into 100% Part Time. Highlights an 100% In-person job distribution, with an average salary of $120,702 per year, or $58 per hour.
Avionics Software Developer

Avionics Software Developer

Accord Technologies Inc.

Rockford, IL • On-site

Contractor

Posted yesterday

Job description

Title: Avionics Software Developer (ADA83/ADA95 & DO-178 Verification)
Location: Rockford, IL (Onsite)
Position type: Contract

Job Summary

We are seeking a hands-on Avionics Software Developer with strong expertise in ADA83/ADA95 programming and DO-178C verification activities.
The role requires active contribution to coding, debugging, and verification of safety-critical avionics software, ensuring compliance with certification standards.

Key Responsibilities

Software Development (Primary Focus)

  • Design, develop, and maintain embedded avionics software using ADA83/ADA95
  • Perform coding, debugging, and optimization of real-time embedded systems
  • Work on low-level drivers, system interfaces, and application software
  • Support software integration with avionics hardware platforms

Verification & DO-178 Activities

  • Perform requirements-based verification as per DO-178C
  • Develop and execute: 
    • Test cases & procedures
    • Test scripts (manual/automated)
  • Conduct: 
    • Unit testing & integration testing
    • Structural coverage analysis (Statement, Decision, MC/DC)
  • Generate verification artifacts: 
    • Test reports
    • Traceability matrices
  • Support verification reviews and certification audits

Compliance & Quality

  • Ensure compliance with DO-178C (Level A/B preferred) processes
  • Maintain end-to-end traceability (requirements → code → test)
  • Participate in code reviews, design reviews, and audits

Required Qualifications

  • Bachelor’s/Master’s in Computer Engineering / Electronics / Aerospace
  • 6+ years of experience in avionics or safety-critical embedded software
  • Strong experience in both development and verification environments

Mandatory Technical Skills

  • ADA83 / ADA95 programming (core requirement)
  • Strong embedded C / real-time systems understanding
  • Hands-on experience in: 
    • DO-178B/C verification processes
    • Requirements-based testing
    • Structural coverage (MC/DC mandatory for Level A)

Verification Tools Experience

  • LDRA / VectorCAST / RTRT / Cantata
  • DOORS or equivalent (requirements traceability)
  • Coverage tools (LDRA / similar)

Additional Technical Skills

  • Debugging tools: Lauterbach, JTAG, GDB
  • Configuration management: Git / ClearCase / SVN
  • Working knowledge of avionics buses: 
    • ARINC 429, ARINC 664, MIL-STD-1553

Preferred Experience

  • Experience working on legacy ADA codebases and enhancements
  • Exposure to Collins Aerospace avionics systems/programs
  • Familiarity with CI/CD in embedded environments