Senior Application Developer

Clark Construction Group, LLC; McLean (VA); On-site; USD 65,000 - 170,000; Full time

Benefits offered by this job

Health benefits

Dental benefits

401(k)

Job summary

Clark Construction Group, LLC seeks a software engineer to own and evolve internal web applications built on the Microsoft stack. You will maintain legacy systems and drive stability for critical operations, collaborating with stakeholders to translate business needs into durable technical solutions.

The role involves modernizing architectures, building RESTful APIs, and ensuring secure, scalable deployments in IIS environments, with opportunities to migrate to cloud and adopt CI/CD practices.

Qualifications

• 6+ years of experience in Microsoft stack development and support.
• Experience with .NET Framework (WebForms, MVC, WCF, or similar).
• Strong SQL Server skills including complex queries and stored procedures.

Responsibilities

• Serve as the primary technical owner for internally developed web apps on the Microsoft stack.
• Maintain, troubleshoot, and enhance legacy applications for stability and performance.
• Analyze and reverse-engineer existing systems to understand business logic and data structures.
• Design and implement improvements to architecture, code, and database design.

Skills

Microsoft stack (C#, VB.NET, SQL)

NET Framework apps

HTML/CSS/JavaScript

Troubleshooting

Independent ownership

Education

Bachelor's degree in CS or related

Tools

Git

Azure DevOps

CI/CD pipelines

Job description

Key Responsibilities

• Serve as the primary technical owner for internally developed web applications built on the Microsoft stack (.NET Framework, SQL Server, IIS).
• Maintain, troubleshoot, and enhance legacy applications to ensure stability and performance for business-critical operations.
• Analyze and reverse-engineer existing systems to understand business logic, database structures, and integrations where documentation is limited.
• Design and implement improvements to application architecture, code structure, and database design to support long-term maintainability.
• Write, refactor, and optimize complex T-SQL queries, stored procedures, and database objects in Microsoft SQL Server.
• Support and manage IIS-hosted applications, including deployment, configuration, and security updates.
• Develop new functionality using C#, .NET, JavaScript, and related technologies.
• Build RESTful APIs or service layers to enable integration between legacy systems and newer applications.
• Contribute to technical decisions related to system modernization, including upgrades, refactoring, cloud migration, or evaluation of COTS solutions.
• Help establish modern development practices such as source control, automated builds, testing, and deployment processes.
• Collaborate with business stakeholders to understand existing workflows and translate them into technical solutions.
• Document system behavior, architecture, and dependencies to improve long-term supportability.
• Provide technical leadership for the platform while remaining hands-on in development and support.
  

Basic Qualifications

• Bachelor’s degree in Computer Science, Software Engineering, Information Systems, or related field
• 6+ years of experience developing and supporting applications in the Microsoft ecosystem (C#, VB.NET, SQL Server)
• Strong experience working with .NET Framework applications (WebForms, MVC, WCF, or similar)
• Solid experience with Microsoft SQL Server, including writing and debugging complex queries and stored procedures
• Experience supporting applications hosted in IIS environments
• Experience working with existing / legacy (“brownfield”) systems
• Experience with HTML, CSS, and JavaScript for web applications
• Strong troubleshooting and problem-solving skills in complex codebases
• Ability to work independently and take ownership of technical solutions

Preferred Qualifications

• Experience modernizing legacy .NET applications to newer versions (.NET 6 / 7 / 8)
• Experience migrating applications to Azure or AWS
• Experience designing APIs or service-based integrations
• Experience with Git, Azure DevOps, or CI/CD pipelines
• Experience evaluating or implementing commercial off-the-shelf (COTS) solutions
• Familiarity with low-code platforms such as Mendix or PowerApps
• Experience in improving or refactoring legacy database schemas

The Physical Side of the Role:

Given that a good portion of your day will be spent at a desk, you should be comfortable with prolonged periods of focused work, whether it’s collaborating with colleagues, analyzing data, or developing strategies. The role demands effective communication and sharp visual acuity for reviewing complex documents and performing detailed computer work. While there are times for quiet concentration, you’ll also be expected to move actively throughout the office and travel occasionally to various locations, including dynamic construction sites, utilizing different modes of transportation. The ability to lift and move objects up to 10 pounds regularly, and up to 25 pounds on occasion (think a box of files or small office equipment), is also required.

Your Work Environment:

Your primary workspace will be in our professional office, which has a typical, quiet-to-moderate noise and light levels. As part of your work, you may also be required to visit active construction sites. These environments are naturally more dynamic and can include exposure to outdoor weather conditions, louder noise, and moving equipment. Your safety is our top priority, and you’ll be expected to follow Clark Construction’s safety policies and procedures, and all applicable laws, at all locations.

Our High-Performing Culture:

This is a demanding, high-performance environment. We are looking for candidates who are energized by challenge, thrive under pressure, and are prepared to do what it takes to achieve exceptional results. Success in this role requires significant commitment, including flexibility to work extended hours, especially during critical project phases or client deadlines. Beyond regular working hours, there will be occasions where business needs require your attention, particularly for time-sensitive matters or emergencies. You are expected to monitor and respond to communications (phone calls, emails, text messages) as required to address these situations effectively. Your ability to manage these expectations and be responsive when critical issues arise is key to your success in this role and our collective success as a team.

A Drug Free Workplace:

Clark promotes a drug free workplace. A pre-employment drug “fitness for duty” screening is required, and the company conducts random quarterly drug “fitness for duty” tests.

Clark offers a total compensation package that includes base salary, bonus potential, and a comprehensive benefits package including health/dental/vision benefits, paid time off, retirement/401k, and Company Contribution plan. Additional benefits include life insurance, commuter benefit, short & long term disability, fitness reimbursement, FSA, tuition reimbursement, back-up daycare, tutoring & family support benefits, EAP/Work-Life assistance, and a holiday contribution program. For this role the base salary range is $65,000-$170,000. Compensation may vary outside of this range depending on a number of factors, including a candidate’s education, experience, skills, and geographic location. Base pay is one part of the Total Compensation Package that is provided to compensate and recognize employees for their work.