What are the responsibilities and job description for the Lead Systems Integration Engineer position at Apex Systems?
Job#: 3018026
Job Description:
Lead Systems Integration Engineer – Hybrid in Milwaukee, WI
Location: Milwaukee, WI (Hybrid – 3 days onsite in downtown Milwaukee)
Contact: Please send your resume to Annie at [email protected]
About The Opportunity
Our client is a leading provider of water, waste, and energy management solutions, supporting commercial, industrial, healthcare, higher education, and municipal customers across North America.
They are seeking a Lead Systems Integration Engineer to join their growing team. This role will serve as the technical leader for integration initiatives, driving design, development, and operational excellence across a modern MuleSoft-based integration landscape.
Position Overview
The Lead Systems Integration Engineer is responsible for project intake, solution design, development, and ongoing operations for enterprise integration solutions—primarily leveraging MuleSoft CloudHub and on‑premise MuleSoft platforms. This role requires deep hands-on integration engineering experience, strong API design skills, and the ability to guide junior developers while collaborating across technical and business teams.
This is a highly visible role within a dynamic, cross-functional environment, offering significant opportunities for technical leadership and career growth.
Key Responsibilities
Integration Project Intake
Education & Experience
Required:
If you’re interested, please email your resume to Annie at [email protected] .
EEO Employer
Apex Systems is an equal opportunity employer. We do not discriminate or allow discrimination on the basis of race, color, religion, creed, sex (including pregnancy, childbirth, breastfeeding, or related medical conditions), age, sexual orientation, gender identity, national origin, ancestry, citizenship, genetic information, registered domestic partner status, marital status, disability, status as a crime victim, protected veteran status, political affiliation, union membership, or any other characteristic protected by law. Apex will consider qualified applicants with criminal histories in a manner consistent with the requirements of applicable law. If you have visited our website in search of information on employment opportunities or to apply for a position, and you require an accommodation in using our website for a search or application, please contact our Employee Services Department at [email protected] or 844-463-6178.
Apex Systems is a world-class IT services company that serves thousands of clients across the globe. When you join Apex, you become part of a team that values innovation, collaboration, and continuous learning. We offer quality career resources, training, certifications, development opportunities, and a comprehensive benefits package. Our commitment to excellence is reflected in many awards, including ClearlyRated's Best of Staffing® in Talent Satisfaction in the United States and Great Place to Work® in the United Kingdom and Mexico. Apex uses a virtual recruiter as part of the application process. Click here for more details.
Apex Benefits Overview: Apex offers a range of supplemental benefits, including medical, dental, vision, life, disability, and other insurance plans that offer an optional layer of financial protection. We offer an ESPP (employee stock purchase program) and a 401K program which allows you to contribute typically within 30 days of starting, with a company match after 12 months of tenure. Apex also offers a HSA (Health Savings Account on the HDHP plan), a SupportLinc Employee Assistance Program (EAP) with up to 8 free counseling sessions, a corporate discount savings program and other discounts. In terms of professional development, Apex hosts an on-demand training program, provides access to certification prep and a library of technical and leadership courses/books/seminars once you have 6 months of tenure, and certification discounts and other perks to associations that include CompTIA and IIBA. Apex has a dedicated customer service team for our Consultants that can address questions around benefits and other resources, as well as a certified Career Coach. You can access a full list of our benefits, programs, support teams and resources within our ‘Welcome Packet’ as well, which an Apex team member can provide.
Apex Systems is a world-class IT services company that serves thousands of clients across the globe. When you join Apex, you become part of a team that values innovation, collaboration, and continuous learning. We offer quality career resources, training, certifications, development opportunities, and a comprehensive benefits package. Our commitment to excellence is reflected in many awards, including ClearlyRated's Best of Staffing® in Talent Satisfaction in the United States and Great Place to Work® in the United Kingdom and Mexico. Apex uses a virtual recruiter as part of the application process. Click here for more details.
Apex Benefits Overview: Apex offers a range of supplemental benefits, including medical, dental, vision, life, disability, and other insurance plans that offer an optional layer of financial protection. We offer an ESPP (employee stock purchase program) and a 401K program which allows you to contribute typically within 30 days of starting, with a company match after 12 months of tenure. Apex also offers a HSA (Health Savings Account on the HDHP plan), a SupportLinc Employee Assistance Program (EAP) with up to 8 free counseling sessions, a corporate discount savings program and other discounts. In terms of professional development, Apex hosts an on-demand training program, provides access to certification prep and a library of technical and leadership courses/books/seminars once you have 6 months of tenure, and certification discounts and other perks to associations that include CompTIA and IIBA. Apex has a dedicated customer service team for our Consultants that can address questions around benefits and other resources, as well as a certified Career Coach. You can access a full list of our benefits, programs, support teams and resources within our ‘Welcome Packet’ as well, which an Apex team member can provide.
Apex Systems is part of the Commercial Segment of ASGN Incorporated.
NYSE: ASGN
4400 Cox Road
Suite 200
Glen Allen, Virginia 23060
Apex Systems is an equal opportunity employer. We do not discriminate or allow discrimination on the basis of race, color, religion, creed, sex (including pregnancy, childbirth, breastfeeding, or related medical conditions), age, sexual orientation, gender identity, national origin, ancestry, citizenship, genetic information, registered domestic partner status, marital status, disability, status as a crime victim, protected veteran status, political affiliation, union membership, or any other characteristic protected by law. Apex will consider qualified applicants with criminal histories in a manner consistent with the requirements of applicable law. If you have visited our website in search of information on employment opportunities or to apply for a position, and you require an accommodation in using our website for a search or application, please contact our Benefits Department at [email protected] or 804-523-8228. (Do not submit resumes or solicit consultants to this email address). UnitedHealthcare creates and publishes the Transparency in Coverage Machine-Readable Files on behalf of Apex Systems.
Job Description:
Lead Systems Integration Engineer – Hybrid in Milwaukee, WI
Location: Milwaukee, WI (Hybrid – 3 days onsite in downtown Milwaukee)
Contact: Please send your resume to Annie at [email protected]
About The Opportunity
Our client is a leading provider of water, waste, and energy management solutions, supporting commercial, industrial, healthcare, higher education, and municipal customers across North America.
They are seeking a Lead Systems Integration Engineer to join their growing team. This role will serve as the technical leader for integration initiatives, driving design, development, and operational excellence across a modern MuleSoft-based integration landscape.
Position Overview
The Lead Systems Integration Engineer is responsible for project intake, solution design, development, and ongoing operations for enterprise integration solutions—primarily leveraging MuleSoft CloudHub and on‑premise MuleSoft platforms. This role requires deep hands-on integration engineering experience, strong API design skills, and the ability to guide junior developers while collaborating across technical and business teams.
This is a highly visible role within a dynamic, cross-functional environment, offering significant opportunities for technical leadership and career growth.
Key Responsibilities
Integration Project Intake
- Translate high-level business requirements into technical estimates and solution approaches
- Identify opportunities for API reuse and strategic API investments
- Design, develop, and maintain integrations using MuleSoft, MFT, and related platforms
- Build and reuse APIs using RAML or OpenAPI specifications
- Lead data mapping and transformation efforts across multiple formats (JSON, XML, CSV, YAML)
- Configure and deploy CI/CD pipelines
- Develop reusable design patterns and automated test suites (unit, performance, load)
- Implement secure integration practices (OAuth, SSH, encryption)
- Document designs, mappings, and SDLC artifacts
- Support SIT and perform hands-on coding and unit testing
- Mentor and support junior developers
- Manage incidents and problems for production integrations
- Enhance logging, alerting, dashboards, and reconciliation reporting
- Support upgrades and improvements to the on‑prem MuleSoft platform
- Maintain visualization dashboards for KPIs and incident response
- Contribute to integration frameworks, schedulers, alerting, and visualization tools
- Improve CI/CD processes using GitLab
- Govern design patterns, documentation, runbooks, and data mappings
- Advance API and data security best practices
- Refine SDLC processes and integration governance
Education & Experience
- Bachelor’s degree in Computer Science, Information Technology, or related field
- 5 years in integration development, software engineering, or data engineering
- 3 years of hands-on MuleSoft integration experience (CloudHub on‑prem)
- Strong experience with HTTP/S, JDBC, JMS, REST, SOAP
- Proficiency with JSON, XML, CSV, YAML, and data mapping
- Experience designing SOAP and REST services
- Knowledge of APIs, ESB, SOA, and workflow frameworks
- Expertise in MuleSoft CloudHub and on‑prem deployment models
- CI/CD and source control experience (GitLab preferred)
- Experience with real-time, near real-time, pub/sub, async, event-driven, batch, and API integrations
- Strong understanding of OAuth, SSH, encryption, and secure integration practices
- SQL and relational database experience
- Agile/Scrum experience
- Test-driven development experience
Required:
- MuleSoft Certified Developer
- MuleSoft Certified Architect
- AWS Solutions Architect
- Agile/Scrum or Kanban training
If you’re interested, please email your resume to Annie at [email protected] .
EEO Employer
Apex Systems is an equal opportunity employer. We do not discriminate or allow discrimination on the basis of race, color, religion, creed, sex (including pregnancy, childbirth, breastfeeding, or related medical conditions), age, sexual orientation, gender identity, national origin, ancestry, citizenship, genetic information, registered domestic partner status, marital status, disability, status as a crime victim, protected veteran status, political affiliation, union membership, or any other characteristic protected by law. Apex will consider qualified applicants with criminal histories in a manner consistent with the requirements of applicable law. If you have visited our website in search of information on employment opportunities or to apply for a position, and you require an accommodation in using our website for a search or application, please contact our Employee Services Department at [email protected] or 844-463-6178.
Apex Systems is a world-class IT services company that serves thousands of clients across the globe. When you join Apex, you become part of a team that values innovation, collaboration, and continuous learning. We offer quality career resources, training, certifications, development opportunities, and a comprehensive benefits package. Our commitment to excellence is reflected in many awards, including ClearlyRated's Best of Staffing® in Talent Satisfaction in the United States and Great Place to Work® in the United Kingdom and Mexico. Apex uses a virtual recruiter as part of the application process. Click here for more details.
Apex Benefits Overview: Apex offers a range of supplemental benefits, including medical, dental, vision, life, disability, and other insurance plans that offer an optional layer of financial protection. We offer an ESPP (employee stock purchase program) and a 401K program which allows you to contribute typically within 30 days of starting, with a company match after 12 months of tenure. Apex also offers a HSA (Health Savings Account on the HDHP plan), a SupportLinc Employee Assistance Program (EAP) with up to 8 free counseling sessions, a corporate discount savings program and other discounts. In terms of professional development, Apex hosts an on-demand training program, provides access to certification prep and a library of technical and leadership courses/books/seminars once you have 6 months of tenure, and certification discounts and other perks to associations that include CompTIA and IIBA. Apex has a dedicated customer service team for our Consultants that can address questions around benefits and other resources, as well as a certified Career Coach. You can access a full list of our benefits, programs, support teams and resources within our ‘Welcome Packet’ as well, which an Apex team member can provide.
Apex Systems is a world-class IT services company that serves thousands of clients across the globe. When you join Apex, you become part of a team that values innovation, collaboration, and continuous learning. We offer quality career resources, training, certifications, development opportunities, and a comprehensive benefits package. Our commitment to excellence is reflected in many awards, including ClearlyRated's Best of Staffing® in Talent Satisfaction in the United States and Great Place to Work® in the United Kingdom and Mexico. Apex uses a virtual recruiter as part of the application process. Click here for more details.
Apex Benefits Overview: Apex offers a range of supplemental benefits, including medical, dental, vision, life, disability, and other insurance plans that offer an optional layer of financial protection. We offer an ESPP (employee stock purchase program) and a 401K program which allows you to contribute typically within 30 days of starting, with a company match after 12 months of tenure. Apex also offers a HSA (Health Savings Account on the HDHP plan), a SupportLinc Employee Assistance Program (EAP) with up to 8 free counseling sessions, a corporate discount savings program and other discounts. In terms of professional development, Apex hosts an on-demand training program, provides access to certification prep and a library of technical and leadership courses/books/seminars once you have 6 months of tenure, and certification discounts and other perks to associations that include CompTIA and IIBA. Apex has a dedicated customer service team for our Consultants that can address questions around benefits and other resources, as well as a certified Career Coach. You can access a full list of our benefits, programs, support teams and resources within our ‘Welcome Packet’ as well, which an Apex team member can provide.
Apex Systems is part of the Commercial Segment of ASGN Incorporated.
NYSE: ASGN
4400 Cox Road
Suite 200
Glen Allen, Virginia 23060
Apex Systems is an equal opportunity employer. We do not discriminate or allow discrimination on the basis of race, color, religion, creed, sex (including pregnancy, childbirth, breastfeeding, or related medical conditions), age, sexual orientation, gender identity, national origin, ancestry, citizenship, genetic information, registered domestic partner status, marital status, disability, status as a crime victim, protected veteran status, political affiliation, union membership, or any other characteristic protected by law. Apex will consider qualified applicants with criminal histories in a manner consistent with the requirements of applicable law. If you have visited our website in search of information on employment opportunities or to apply for a position, and you require an accommodation in using our website for a search or application, please contact our Benefits Department at [email protected] or 804-523-8228. (Do not submit resumes or solicit consultants to this email address). UnitedHealthcare creates and publishes the Transparency in Coverage Machine-Readable Files on behalf of Apex Systems.