Senior Application Developer

footprint Solutions-posted 2 months ago

$115,000 - $130,000/Yr

Full-time • Senior

Lisle, IL

1,001-5,000 employees

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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.

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

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

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

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

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