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Senior Software Engineer Jobs in Waterloo, IL (NOW HIRING)

SV Tech Systems Inc

Senior Java Software Engineer.

Clayton, MO · On-site

$116K - $153K/yr

Senior Java Software Engineer. Location: Weldon or Clayton, MO Duration: Long term Contract Face to Face interview. Responsibilities As a Senior Software Engineer on the Vehicle Management Team, you ...

Equifax, Inc.

Senior Software Engineer

Saint Louis, MO · On-site

$119K - $157K/yr

Our software engineering positions provide you the opportunity to join a team of talented engineers working with leading-edge technology. You are ideal for this position if you are a forward-thinking ...

Healthcare

ENGR SR SOFTWARE DEVT

Saint Louis, MO · Remote

$119K - $157K/yr

Senior Software Engineer 3M Health Care is now Solventum At Solventum, we enable better, smarter, safer healthcare to improve lives. As a new company with a long legacy of creating breakthrough ...

Healthcare

ENGR SR SOFTWARE DEVT

Saint Louis, MO · Remote

$119K - $157K/yr

Senior Software Engineer 3M Health Care is now Solventum At Solventum, we enable better, smarter, safer healthcare to improve lives. As a new company with a long legacy of creating breakthrough ...

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Showing results 21-40

All JobsSoftware Engineer JobsSenior Software Engineer JobsSenior Software Engineer Jobs in Waterloo, IL

Senior Software Engineer information

See Waterloo, IL salary details

$69.9K

$132.7K

$177.8K

How much do senior software engineer jobs pay per year?

As of Sep 15, 2026, the average yearly pay for senior software engineer in Waterloo, IL is $132,717.00, according to ZipRecruiter salary data. Most workers in this role earn between $113,500.00 and $149,600.00 per year, depending on experience, location, and employer.

What is a senior software engineer?

A senior software engineer designs, codes, tests, and maintains computer software. While these are your primary responsibilities as a senior software engineer, you may also have supervisory duties. These include overseeing a team of junior software engineers or developers. The senior software engineer title is sometimes used interchangeably with senior developer, and positions for both may share similar job duties and responsibilities. In general, software engineers are distinguished from developers in that software engineers apply engineering principles to software development.

What are the key skills and qualifications needed to thrive as a senior software engineer, and why are they important?

To thrive as a Senior Software Engineer, you need advanced programming skills, deep understanding of software architecture, and several years of experience in software development, often supported by a relevant degree. Familiarity with tools like Git, CI/CD pipelines, cloud platforms, and expertise in technologies such as Java, Python, or JavaScript are typically required. Leadership, problem-solving, and effective communication are crucial soft skills for mentoring teams and collaborating across departments. These skills ensure the delivery of robust, scalable solutions and drive successful project outcomes in complex technical environments.

What are some common challenges senior software engineers face when mentoring junior team members?

Senior Software Engineers often mentor junior colleagues, which can be incredibly rewarding but also presents challenges. Balancing mentorship with project deadlines can be demanding, as it requires strong time management and communication skills. Additionally, adapting explanations to different learning styles and levels of experience can be tricky. However, effective mentorship helps build a stronger team and can lead to enhanced leadership opportunities for the senior engineer.

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

AspectSenior Software EngineerSoftware Developer
CredentialsBachelor's or higher in CS or related field; experience often 5+ yearsBachelor's in CS or related field; entry to mid-level experience
Work EnvironmentDesigning complex systems, leading projects, mentoringWriting code, developing features, debugging
Industry UsageUsed across tech companies, startups, enterpriseCommon in software firms, startups, freelance work
Search & ComparisonOften compared for experience level, responsibilitiesCompared for entry-level to mid-level roles

The main difference between a Senior Software Engineer and a Software Developer lies in experience, responsibilities, and scope. Senior Software Engineers typically have more experience, lead projects, and mentor others, while Software Developers focus on coding and feature development. Both roles are essential in tech companies, but the Senior Software Engineer position involves higher-level planning and leadership.

What does a senior software engineer do?

A senior software engineer designs, develops, and maintains software applications, often leading projects and mentoring junior team members. They analyze requirements, write code, perform testing, and collaborate with cross-functional teams to ensure quality and efficiency. Proficiency in programming languages, problem-solving skills, and experience with development tools are essential for this role.
More about Senior Software Engineer jobs

What are the most commonly searched types of Software Engineer jobs in Waterloo, IL?

The most popular types of Software Engineer jobs in Waterloo, IL are:

What cities near Waterloo, IL are hiring for Senior Software Engineer jobs?

Cities near Waterloo, IL with the most Senior Software Engineer job openings:

Infographic showing various Senior Software Engineer job openings in Waterloo, IL as of August 2026, with employment types broken down into 100% Full Time. Highlights an 100% In-person job distribution, with an average salary of $132,717 per year, or $63.8 per hour.

Senior Software Engineer 622

Saint Louis, MO • Remote

Freedom Technology Solutions Group
See more jobs at Freedom Technology Solutions Groupexternal

$119K - $157K/yr

Full-time

Re-posted 23 days ago

Key responsibilities

  • Lead the design, development, and deployment of enterprise-scale backend services.

  • Architect and optimize secure DevSecOps pipelines and automated testing frameworks.

  • Supervise development teams and provide technical mentorship.

Job description

Freedom Technology Solutions Group is seeking a Software Developer to support our client's intelligence analysis products and capabilities. This position involves providing software development capabilities to enhance existing and emerging client capabilities, including design and development, modernization of existing applications and services, and operations and sustainment. The role focuses on driving the client's adaptation of higher levels of automation and operational efficiency through agile development methodologies, rapid prototyping, and modern technology stacks. 

The Senior Software Developer provides comprehensive knowledge across multiple backend and cloud technologies, leading major assignments and guiding project outcomes. Functions as a technical expert and may lead teams of developers. 

Responsibilities: 

  • Lead the design, development, and deployment of enterprise-scale backend services.
  • Architect and optimize secure DevSecOps pipelines and automated testing frameworks.
  • Direct the migration, scaling, and modernization of applications in AWS environments.
  • Drive geospatial solution integration across enterprise applications.
  • Define technical standards, coding guidelines, and best practices.
  • Supervise development teams and provide technical mentorship.
  • Evaluate performance results and recommend project-wide improvements.
  • Support proposal writing, technical white papers, and client briefings. 

Key Technologies:

  • Linux
  • Java, JavaScript, Python
  • Containerization (Docker, OpenShift, Kubernetes, ...)
  • AWS Services
  • GitLab
  • Apache Spark, Glue, and other ETL processes/procedures
  • Data Types: Structured and Unstructured, Parquet, JSON, XML, etc. 

Required Qualifications:

  • Active security clearance TS/SCI (eligible for CI Poly).
  • 9-13 years of backend development experience.
  • Expert proficiency in Java, JavaScript, and/or Python.
  • Proven leadership in DevSecOps adoption and Agile/SAFe development frameworks.
  • Advanced AWS expertise, including architecture and deployment of containerized applications.
  • Deep experience with geospatial systems and enterprise integration.
  • Strong ability to plan, manage, and deliver complex technology assignments.
  • Using GitLab for code source repository and using GitLab CI/CD
  • Developing customized code, scripts, modules, macro procedures, or libraries for specialized spatial analysis functions using languages such as Python, Java, JavaScript, PHP, C, C++, C#, Perl, or similar
  • Experience working independently with clients or stakeholders to develop user stories for full-service consumer and business applications 

Desired Qualifications:

  • Experience with government and/or commercial imagery products, including SAR or related RADAR imaging technologies
  • Developing geospatial information systems (GIS) and working with open-source and proprietary geospatial formats
  • Using and developing common geospatial tools, data, and operating platforms such as:
    • Tools: Boundless Spatial suite, Remote View, PostGRES/PostGIS, Oracle Spatial, ArcGIS Desktop, ArcGIS Server, Image Server, File Geodatabases
    • Data Formats: KML, KMZ, NITF, TIFF, JPEG, GeoPDF, and similar geo-related formats and data structures
  • Abstracting new or legacy systems via standards-based APIs, including Open Geospatial Consortium standards
  • Developing terrain analysis visualization and algorithms
  • Developing automated detection algorithms
  • Experience with Argo Workflows 

Apply