Senior Backend API Developer - Cross-Platform Mobile Apps (6-Month Contract, Part-Time, Remote)

This position will be a 6-month contract role, part-time and fully remote. Preference is to hire someone closer to Chicago, IL.

We prefer candidates local to Chicago if possible or close enough to commute if needed to come onsite maybe 2 to 3 times during the 6 month period so they can be as far as 3-4 hrs if they are open to coming one or 2 times

.
Please ensure there are no restriction with you working part-time for example sometimes people on H1B visa must work 40 hrs. et

c.
We are not looking for a traditional Mobile Developer. Instead, we need a programmer with strong experience in backend API development, RESTful services, and system integration within cross-platform mobile environments. Experience with GPS-related functionality in applications is a pl

us.

Job Descri

ptionWe are looking for a Programmer/Analyst III to support the Chicago Accessible Intersection Navigation (CAIN) initiative by designing, developing, testing, and implementing software solutions for a cross-platform mobile application and supporting backend sys

tems.

What Yo

• u’ll DoAnalyze user and stakeholder requirements to determine feasibility, scope, and compatibility with existing system archi
• tectureDesign and plan software components using structured analysis, flowcharts, and system design method
• ologiesDevelop, test, and document software solutions for cross-platform mobile applications (iOS and Android) using the Ionic fr
• ameworkBuild and integrate backend APIs and support system integrations with external platforms such as Miovision SPaT API and CD
• OT ATMSDevelop and maintain application logic including routing algorithms, intersection logic, and performance optim
• izationCreate mock API layers to support parallel development across integrated
• systemsImplement UI enhancements, system hardening, and final production-ready f
• eaturesDeploy mobile applications and APIs to cloud environments and support pilot program launch act
• ivitiesParticipate in system integration testing (SIT), QA, and User Acceptance Testing (UAT) with stake
• holdersSupport field testing and validate performance in real-world envir
• onmentsPerform security testing and remediation aligned with OWASP ASVS st
• andardsMaintain high unit test coverage and ensure code quality standards
• are metMonitor application performance post-deployment and support operational stabilization
• effortsCollect and report system performance metrics aligned with project requi
• rementsEnsure all documentation aligns with coding standards, accessibility guidelines, and quality expec

tations
What You

’ll NeedR

• equired:Bachelor’s degree in Computer Science, Information Technology, or a related field, or equivalent practical ex
• perienceExperience developing cross-platform mobile applications (iOS and Android), preferably using the Ionic f
• rameworkStrong experience with backend API development, RESTful services, and system int
• egrationExperience with system integration testing, QA processes, and defect rem
• ediationFamiliarity with accessibility standards such as WCA
• G 2.1 AAUnderstanding of security best practices and OWASP ASVS s
• tandardsStrong analytical, problem-solving, and written communicatio
• n skillsExperience working in Agile/Scrum development envi

ronmentsPr

• eferred:Experience with traffic management systems, SPaT data, or intelligent transportation
• systemsFamiliarity with cloud deployment environments and CI/CD p
• ipelinesExperience supporting federally funded or government technology
• projectsKnowledge of assistive technology and accessibility-focused dev