Senior Full Stack .NET Engineer

Lock Net is seeking a seasoned Full Stack .NET Engineer to help modernize and transform our legacy system. This is a senior-level role designed for engineers who can deliver results with speed, precision, and autonomy. We’re assembling a fast-moving, high-performing engineering team where every team member owns the work and drives measurable impact. This role requires technical fluency, ownership, and the ability to execute effectively in high-pressure, fast-paced environments.

• Rapidly gain fluency in a 2M+ line  codebase and help evolve it for today’s needs.
• Build and enhance the C# middle layer using Entity Framework Core.
• Design and implement full-feature solutions alongside our product owner.
• Triage and resolve critical, high-stakes bugs.
• Own integrations with third-party APIs (UPS, Vertex, Fed Ex, Twilio).
• Collaborate with other high-performing developers to raise the bar for the platform.

• (legacy reverse engineering)
• C# / ASP.NET Core / Razor MVC
• Entity Framework Core
• SQL Server
• Azure Dev Ops, Git Hub Copilot
• 3rd-party APIs (UPS, Vertex, Twilio, Fed Ex, Azure)

We’re looking for someone operating at the top of their game—able to lead with both technical excellence and business awareness. This role requires more than skill; it requires a behavioral profile marked by:

• High autonomy (Predictive Index Factor
  
  A):
  You are assertive, self-driven, and energized by ownership. You don’t wait to be told—you take initiative, act decisively, and push projects forward.
• Fast-paced drive (Predictive Index Factor
  
  C):
  You thrive in fast-paced, ambiguous environments. Momentum matters and you adapt quickly, prefer action over perfection, and clear blockers quickly.
• You demonstrate maturity in both craft and judgment, bringing sharp technical skills and wise decision-making to high-impact work.
• You work with urgency and precision—comfortable shifting between deep technical problem-solving and real-time execution.
• You are comfortable operating in lean environments and solving business-critical issues under pressure.

• 8+ years of professional experience with full stack .NET development
• Proficiency in both legacy systems and modern C#/EF Core patterns
• Must be located within ~4 hours of Nicholasville, KY
• Able to work Eastern Time Zone hours for real-time collaboration
• Open to onsite team strategy sessions 1-2 times per year
• Experience with legacy code migrations
• Past success in high-urgency environments
• Systems thinking and architecture-level insight

We treat AI as a force multiplier. You should too. We’re looking for someone who sees AI as a tactical and strategic coding partner—a tool to accelerate system understanding, eliminate grunt work, and dramatically boost output and clarity. If you’re not already leaning into tools like ChatGPT, Git Hub Copilot, and others to help you architect, debug, refactor, and document—this is where you’ll do it.

We expect our developers to produce high-leverage output using AI, not to compete with it. We’re a fast-moving, impact-driven team. We prioritize outcomes over process, and we value people who take initiative and deliver working solutions that move the business forward.

• Navigating legacy systems and ambiguity without losing momentum
• Taking ownership and delivering without needing rigid specs or long feedback cycles
• Being adaptable—context shifts fast, and priorities evolve based on the business need
• Making pragmatic tradeoffs between ideal engineering and what the business needs now
• Staying energized by complexity, growth, and problem-solving at speed

If you thrive with clarity of mission but flexibility in execution, you’ll be in good company here.

If you’re looking to raise the bar—not just meet it—Lock Net is the place. We’re a fast-growing company in the middle of a major modernization initiative. Your ideas will be heard. Your code will ship. And your impact will be visible. Join us and help build the future—fast.

• Mid-Senior level

• Full-time

• Engineering and Information Technology

• Facilities Services