Sr Solutions Engineer/ Application Developer

job summary:Role OverviewWe are seeking an experienced, forward-thinking Lead / Principal Full-Stack Software Engineer to join our engineering team. In this role, you will champion technical execution, spearhead system-wide modernization initiatives, and drive the evolution of high-performance architecture. You will handle everything from modern microservices and API strategy down to the intricate mechanics of refactoring and migrating mission-critical legacy applications.Beyond technical mastery, you will serve as a foundational mentor to junior and mid-level developers, instilling engineering best practices, robust unit-testing cultures, and collaborative code craftsmanship across the entire department.location: Holland, Michiganjob type: Contractsalary: $40 - 57 per hourwork hours: 8am to 5pmeducation: Bachelorsresponsibilities:Primary ResponsibilitiesArchitecture & Evolution: Architect, implement, and maintain scalable N-tier applications and modern microservices frameworks using the Microsoft stack and advanced JavaScript ecosystems.Application Modernization: Strategize and execute the systematic breakdown, refactoring, and migration of legacy systems (including Classic ASP and monolithic environments) into modern cloud-native architectures.Performance Engineering: Diagnose performance bottlenecks and systematically implement caching strategies and database optimizations to ensure elite software reliability, throughput, and sub-second response times.Technical Leadership & Mentorship: Provide active engineering mentorship to junior and mid-tier developers. Champion architectural reviews, pair programming sessions, and foster an environment of continuous technical growth.DevOps & Quality Assurance: Drive code quality through strict test-driven frameworks (Unit, Integration) and collaborate with DevOps to implement reliable automated CI/CD deployment pipelines.Experience & Qualifications Work Experience:8+ years software development experience, including 5+ years web full-stack development experience utilizing relevant skillsExperience in providing technical leadershipExperience in mentoring junior developersSkills and Knowledge:Strong verbal and written communication skillsExcellent problem-solving skills, including troubleshooting and debuggingAbility to learn quicklyPassion for technologyNaturally curious, willing to learn and experimentSelf-directed, accountable, and disciplined to prioritize and manage multiple tasksRequired SkillsExtensive IDE experience (Visual Studio, VS Code) MVC Framework, C#, HTML5, CSS, JavaScript, TypeScript, jQuery, Bootstrap, GitAngular (or React/Vue.js)N-tier Application Development, MicroservicesAPIs, OData/RESTful services, message queuesUnit testing (NUnit, Jasmine, Jest)Caching strategies, optimization techniquesApplication modernization, code refactoringData modeling (3rd normal form), SQL Server/PostgreSQLAzure or AWS fundamentalsDevOps: CI/CD pipelines, automated deploymentNice to Have:Legacy Technologies: Classic ASP, legacy system migrationUI Components: Telerik, DevExpressCloud Services: Cloudflare, CDN managementMicrosoft Stack: UWP, MAUI, BlazorAdditional: API Management, containerization (Docker), monitoring toolsDatabase: NoSQL experience (MongoDB, Redis)Security: OAuth, JWT, security best practicesqualifications:Experience & Qualifications8+ Years of Professional Experience in full-stack software development building enterprise-grade software applications.Proven track record of success migrating, modernizing, and optimizing legacy systems without impacting active production availability.Demonstrated leadership capacity with a genuine enthusiasm for mentoring peers and elevating overall team performance.Deep understanding of data modeling practices, specifically including 3rd Normal Form (3NF) optimization.Equal Opportunity Employer: Race, Color, Religion, Sex, Sexual Orientation, Gender Identity, National Origin, Age, Genetic Information, Disability, Protected Veteran Status, or any other legally protected group status.At Randstad Digital, we welcome people of all abilities and want to ensure that our hiring and interview process meets the needs of all applicants. If you require a reasonable accommodation to make your application or interview experience a great one, please contactPay offered to a successful candidate will be based on several factors including the candidate's education, work experience, work location, specific job duties, certifications, etc. In addition, Randstad Digital offers a comprehensive benefits package, including: medical, prescription, dental, vision, AD&D, and life insurance offerings, short-term disability, and a 401K plan (all benefits are based on eligibility).This posting is open for thirty (30) days.