Senior Software Developer

IT Labs

Yigo Municipality, Guam, United States (hybrid)ContractPosted Oct 22, 2026

About the role

At IT Labs, we are looking for a Senior Software Developer to join a client project focused on modernizing large-scale enterprise applications and business-critical workflows.

The role will support the transition of legacy systems into a modern application environment, with a strong focus on data migration, system integrations, workflow automation, permitting processes, and customer-facing digital services.

This is a hands-on engineering role for someone comfortable working across application development, databases, integrations, reporting, and complex existing systems.

What You'll Do

Develop and enhance enterprise applications using C# and .NET.

Support the modernization and migration of legacy applications, including systems built on MS Access, Mainframe technologies, and other legacy platforms.

Ensure data integrity, validation, and consistency throughout large-scale migration activities.

Build and maintain web functionality using JavaScript, jQuery, AJAX, and DOM manipulation.

Develop and optimize Oracle SQL and PL/SQL, including complex queries, stored procedures, and database structures.

Design and maintain applications using MVC architecture, including routing, application security, and maintainable development practices.

Develop and support secure integrations using RESTful and SOAP web services.

Build and maintain SSIS ETL processes, including data transformation and performance optimization.

Design, deploy, and integrate SSRS reports supporting operational and business reporting needs.

Develop and improve automated business workflows, workload assignment processes, and customer-facing digital services.

Support online submission, tracking, invoicing, payment, and related business processes.

Integrate applications with Enterprise Content Management (ECM) and other external systems.

Collaborate with business users, technical teams, vendors, and other stakeholders to understand requirements and translate them into reliable software solutions.

Support modernization of complex applications used across high-volume enterprise environments.

What We're Looking For

Strong hands-on experience with C# and the .NET Framework.

Solid understanding of object-oriented programming, debugging, clean code, and maintainable software design.

Strong experience with JavaScript and jQuery, including AJAX and asynchronous web interactions.

Advanced experience with Oracle SQL and PL/SQL.

Experience developing applications using the MVC framework.

Experience developing Windows and web-based applications.

Hands-on experience with REST and/or SOAP APIs and secure system integrations.

Strong experience with SSIS, including ETL development, data transformations, and performance tuning.

Experience developing and integrating reports using SSRS.

Experience modernizing or integrating large-scale enterprise applications.

Practical experience with legacy-system migration and data migration projects.

Experience developing or supporting complex automated workflows and business processes.

Strong troubleshooting, analytical, and problem-solving skills.

Excellent written and verbal communication skills and the ability to work effectively with cross-functional teams.

Nice to Have

Previous experience supporting government, public-sector, permitting, licensing, or regulatory systems.

Experience with large-scale application and data migration initiatives.

Experience with permitting, inspection, review, invoicing, payment, or similar transactional workflows.

Experience integrating enterprise applications with ECM platforms.

Experience working with systems where historical records, regulatory requirements, and data integrity are particularly important.

Working Conditions

Hybrid engagement, with onsite presence based on the client's project requirements.

Full-time engagement.

U.S. citizenship is required for this engagement.

Engagement is offered on an Individual Contractor or B2B contract basis.

Paid Time Off (PTO) is included as part of the engagement.

Full-time commitment, working in alignment with the client's business hours and project needs.

Long-term collaboration with IT Labs, working directly with an enterprise client environment.

Our values

We are a company that seeks the best for both our employees and clients, reaching beyond expectations in turning dreams into reality. Our way of working is rooted in our core values (Integrity, Excellence, Proactivity, Innovation, and People), with an expectation that our future colleagues will make these their second nature in their everyday work and life. We don’t ask for perfection, but we do appreciate people motivated to better themselves in every conceivable aspect.

About IT Labs

Founded in 2005, IT Labs is an international software tech company, specializing in purpose and process-driven teams for high-performance, innovation, transformation, and efficiency. Our HQ is in Palm Beach Gardens, Florida, and we have teams around the world - the UK, the Netherlands, Brazil, Argentina, Serbia, Croatia, BIH, Montenegro, North Macedonia, and the Middle East. We are constantly growing, and we would love for you to become part of our team!

Responsibilities

  • Develop and enhance enterprise applications using C# and .NET.
  • Modernize legacy applications and support large-scale data migration.
  • Develop web functionality, database solutions, integrations, ETL processes, and reports.
  • Automate business workflows and support customer-facing digital services.
  • Collaborate with business users, technical teams, vendors, and stakeholders.

Qualifications

  • Strong hands-on experience with C# and the .NET Framework.
  • Experience with JavaScript, jQuery, AJAX, MVC, and web and Windows applications.
  • Advanced Oracle SQL and PL/SQL experience.
  • Experience with REST or SOAP integrations, SSIS, and SSRS.
  • Experience modernizing enterprise applications, migrating data, and supporting complex workflows.
  • Strong analytical, troubleshooting, communication, and collaboration skills.
  • U.S. citizenship is required.

Benefits

  • Paid time off (PTO)
  • Long-term collaboration with IT Labs and an enterprise client

Skills mentioned

C#.NETJavaScriptSQLOracle DatabaseREST APIsAPI IntegrationETLWorkflow AutomationDebugging

About IT Labs

Creating a Better Future, Together Founded in 2005 in Los Angeles, IT Labs brings skilled tech professionals together to develop high-performing software development teams. With a global presence across North America, Europe, and South America, we've built a thriving ecosystem of 700+ members across multiple continents. Our Services We deliver comprehensive technology solutions tailored to your business needs. Our services include: - Data Science & AI Strategy: Combining advanced analytics and artificial intelligence to unlock insights and enable confident, strategic decision-making. - Team-as-a-Service (TaaS): Purpose-built, high-performing development teams that offer flexibility, speed, and deep technical expertise to accelerate delivery. - Security Services: Protecting your business with penetration testing, vulnerability management, and managed security services. - Training: Building stronger tech teams through targeted programs and continuous upskilling to enhance capabilities. Build Your Career with Us IT Labs offers a platform for professionals to grow and develop. Our culture emphasizes idea meritocracy, radical transparency, and proactivity, creating an environment where innovation thrives and careers flourish. Join us to work on international projects that challenge you to reach your full potential while being part of a community that values your growth and contribution.

Software Development201-500 employeesPalm Beach Gardens, FL

H-1B sponsorship history

Historical employer filing data was found for IT Labs. The employer record includes 21 historical certified applications. This is employer-level history, not a guarantee that this role currently offers sponsorship.