Senior Application Developer

footprint Solutions • Lisle, IL

120d • $115,000 - $130,000

About The Position

As a Senior Application Developer / Technical Lead, you will be a key driver in architecting, designing, and implementing robust enterprise applications (both internal and client-facing). You’ll work across the full lifecycle—requirements, design, coding, testing, deployment, monitoring—and guide modernization of legacy systems. You will lead, by example, mentor junior team members, and partner with stakeholders to deliver scalable, secure, high-performance solutions.

Requirements

• Bachelor’s degree in computer science, Information Systems, or equivalent technical field (or equivalent experience)
• 5+ years of professional software development experience with Microsoft / .NET stack
• Proven record in architecting and implementing end-to-end enterprise systems
• Strong experience with C#, Blazor, .NET 6+, ASP.NET, .NET Framework, HTML, XML, JSON
• Strong experience with MS SQL Server (schema design, T-SQL, performance tuning)
• Experience with MS SQL Server database administration tasks
• Excellent problem-solving, diagnostic, and debugging skills
• Experience with RESTful APIs / Web API / Web Services
• Experience with ORM / data-access patterns (EF Core, LINQ)
• Experience with source control systems TFS / Git
• Legacy system modernization (e.g., VB6, COM, classic ASP, VB.NET, .NET Framework)
• Strong verbal and written communication skills; ability to present to technical & non-technical audiences
• Ability to work independently, take ownership, and drive projects to completion
• Adaptability to new tools and platforms as needed
• Ability to lead, mentor, and conduct code reviews

Nice To Haves

• Experience with .NET MAUI (Xamarin) or cross-platform mobile development
• Familiarity with front-end technologies (e.g., JavaScript or SPA frameworks)
• Experience with Great Plains
• Experience in building AI-driven features or leveraging AI tools to accelerate development
• Experience with Unitrends for database backups
• Expertise in Azure services (e.g., Functions, Service Bus, Logic Apps, Cosmos DB) or AWS
• Experience with Agile / Scrum methodologies
• Experience with CI/CD pipelines and tooling (Azure DevOps, GitHub Actions)
• Domain experience in retail, merchandising, supply chain, POS systems

Responsibilities

• Collaborate with business stakeholders, analysts, and leadership to define technical strategy, roadmap, and architecture
• Execute full software development lifecycle: requirements gathering, solution design, coding, testing, deployment, and support
• Architect and build scalable, maintainable, and high-availability systems
• Develop front-end / UI capabilities using C# / Blazor / .NET Framework
• Develop back-end services using C#, .NET 6+, Web API and data access using EF Core
• Complete database design, object creation, performance tuning/optimization, and heavy T-SQL query / stored procedure construction using MS SQL Server
• Administer MS SQL Server databases, performing routine tasks such as backups and restores
• Construct reports using SSRS and Report Builder
• Maintain, monitor, troubleshoot, and enhance a wide range of legacy systems and reports
• Integrate with third-party systems, external APIs, messaging systems, and middleware
• Refactor, modernize, and migrate legacy tools and systems (e.g., migrating older VB/COM and .NET Framework assets to newer platforms)
• Monitor, troubleshoot, and optimize system performance, latency, memory usage, and scalability
• Implement logging, telemetry, diagnostics, alerting
• Enforce security best practices
• Mentor and coach mid- and junior-level engineers
• Provide cross-team support, participate in on-call rotation, and backup for peer systems as needed
• Maintain up-to-date technical documentation and ensure knowledge transfer to the team
• Other reasonable duties as assigned

Benefits

• Medical, Dental, Vision, Life/AD&D, short and long term disability insurance, FSA (qualified health and dependent care) effective first of the month after 30 days of employment
• Employee Assistance Program – free and confidential
• 401k – for new employees, eligible after 12 months of employment, must be at least 21 years of age, employer match 100% on first three percent of employee contributions and additional 50% up to next two percent of employee contributions
• Vacation: for new employees to accrue ten (10) hours of time per month
• Floating Holidays (i.e. personal days) – sixteen (16) hours of time per calendar year (prorated for this year)
• Illinois Paid Leave for All Workers paid time off (48 hours per calendar year) – only available to those working in the state of Illinois. Working outside of IL: eligible for up to 48 hours of paid sick time per calendar year (prorated for this year)
• Eight (8) company paid holidays per calendar year

What This Job Offers

• Job Type: Full-time
• Career Level: Senior
• Education Level: Bachelor's degree
• Number of Employees: 1,001-5,000 employees