
Software Engineer II (.Net Developer)
Chicago, ILJobSeen 1 day agoSeen in employer's feed 1 day ago
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At a glance
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Job overview
The Software Engineer II develops and maintains applications, analyzes and designs business logic, and contributes to APIs, user interfaces, and database architecture. The role includes testing, debugging, documenting, and supporting software through an Agile delivery process. The engineer works with end-users, IT peers, managers, and quality assurance, and helps investigate production incidents and improve application performance.
Skills & qualifications
Skills
Qualifications
Benefits
Full job description
Paychex is reimagining how businesses manage their workforce by bringing payroll, HR, benefits, and advisory services together into a single connected HCM platform. As Paychex and Paycor come together, we're combining innovative technology, data-driven insights, AI, and human expertise to help organizations work smarter, support their people, and achieve better business outcomes. This is an exciting time to join our team as we continue to invest in innovation, simplify client experiences, and shape the future of work. At Paychex, you'll have the opportunity to grow your career, make a meaningful impact, and be part of something bigger as One Paychex.
Overview
As a Software Engineer II you are critical to the team's success and delivery of MVI's. Your primary role includes system analysis, coding, testing, debugging, documenting, and installing portions of new systems and modifying existing systems. To be successful in this role you need expertise in application and database design, as well as software implementation and graphical user interface design. Like the industry, we move fast. We need you to stay fresh with new technology, software and architecture so that you can innovate daily. As a Software Engineer II everyday will bring new technology challenges. Keep in mind that as an Agile team member you may be asked to step beyond coding and do whatever is necessary to help your team deliver in a sprint.
Responsibilities
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Develop new applications, modify and maintain existing software, working closely with end-users, IT peers and management.
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Make changes to prevent recurrence, modifying existing code and faulty files, writing and running special programs.
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Participate in estimations, planning of feature releases, be involved in system feasibility check activities and developing design documentation.
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Implement complex APIs using appropriate algorithms and data structures.
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Extend features to existing software applications.
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Analyze, design and develop complex business logic.
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Develop UI components using JavaScript frameworks and optimize DOM rendering.
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Participate in design and implementation of Database architecture.
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Work together with peers, managers and quality assurance team to build a complete shippable product within the Agile methodology framework and track and report progress of deliverables.
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Document the new applications, or the changes made to existing applications.
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Participate in unit, integration, and business acceptance testing of the applications.
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Develop automation for unit test cases for features.
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Stimulate system load testing to identify performance issues, assess risk and highlight in a timely manner.
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Fix defects identified during integration and user acceptance testing and complete defect root cause analysis.
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Analyze production incidents and provide quick work around until it is fixed in future releases as well as troubleshoot application and system issues when required.
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Monitoring event and exception logs for application to identify system issues and report and track any identified bugs.
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Data validation & patching using SQL data query language.
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Do whatever is necessary to get to your team's definition of done.
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Stay current on emerging technologies.
Qualifications
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in Bachelor's in computer science, computer engineering or related field. - Preferred
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2 years of experience in a related area.
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2 years of experience in at least one of these frameworks: C#, SQL, ASP.Net, PowerBuilder, HTML 5.0, CSS, or JavaScript Frameworks.
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2 years of experience in front-end frameworks such as: MVC, Ember, Web Forms, Angular, KnockoutJS or Node.
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Js.
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2 years of experience in middleware pattern such as: REST, Class Libraries as a Layer, WCF or SOAP Web Services.
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2 years of experience in data storage technology such as: Microsoft Entity Framework accessing the data, Relational Databases (SQL, Oracle, MySQL, etc.), or NoSQL Technologies (Hadoop, Mongo, etc.).
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Ability to combine and integrate the above-mentioned elements as an effective full stack software developer.
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Understanding of unit testing concepts and frameworks preferred.
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Ability to be self-directed.
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Familiar with an Agile environment.
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Participation and familiarity with open source projects is a plus.
Live the Paychex Values
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Act with uncompromising integrity.
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Provide outstanding service and build trusted relationships.
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Drive innovation in our products and services and continually improve our processes.
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Work in partnership and support each other.
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Be personally accountable and deliver on commitments.
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Treat each other with respect and dignity.
What's in it for you?
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We value your well-being: We provide over 21 comprehensive rewards, including medical coverage, virtual wellness classes, tuition reimbursement, 401(k) + employer match, adoption assistance, financial assistance, and much more.
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We value your time: From paid time off to company holidays, culture days, and comprehensive work-life balance programs, we will ensure you have the flexibility you need to be your best.
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We value your development: Our award-winning training and development programs empower our employees with ongoing learning opportunities to give you the building blocks to grow your career.
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We value your perspective: Our company culture reflects the diversity of our employees. We want you to be you and your voice to be heard.
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We value our communities: We offer paid time off for volunteerism and promote many company-wide and local initiatives that benefit organizations you care about.
Note: The benefits described apply to full-time employees. Benefits for part-time, contract, and intern roles may vary.
Not sure if you meet every requirement?
At Paychex, we know that great talent comes in many forms. If you're passionate about the role but don't check every box, we still encourage you to apply. You might be the right fit - either for this position or another opportunity with us.
Paychex is an equal opportunity employer. We are committed to fostering a respectful and inclusive workplace where all individuals are treated fairly and evaluated based on their qualifications, experience, and merit. We comply with all applicable federal, state, and local laws prohibiting discrimination in employment.
How this job compares
Set against the 41,744 open Software Engineer jobs on Olive Jobs, counted November 8, 2026.
- Pay
- This postingNot listed
- Illinois median$120–200K/yr660 salary ranges
- Illinois median$40–64/hr28 hourly ranges
- Openings
- Olive Jobs lists 778 open Software Engineer jobs in Illinois and 41,744 across the US. 8% of them nationwide are listed as remote or flexible.
- Hiring the most in Illinois
- Oracle80 open
- Deloitte49 open
- Kelly Services31 open
- Experience
- This posting asks for at least 2 years of experience — less than three in four Software Engineer postings that state a minimum ask for (median 5 years, across 34,145 postings).
- Education
- 13,036 of the 41,744 open Software Engineer jobs (31%) ask for a bachelor's degree or higher.
Counted across the open, public US postings on Olive Jobs on November 8, 2026. Pay medians are the middle values of the low ends and of the high ends of postings that list both ends of a range in the same cadence (a yearly salary or an hourly rate); a range's midpoint is halfway between its ends. Pay and experience figures resting on fewer than 20 postings are left out.
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