Sr. Web Application Developer

Leidos Holding$107K — $195K *
Enterprise Technology
8 - 10 years of experience
Job Overview by Ladders

Qualifications

  • 8+ years of experience in full-stack web application development, including .NET/C# and modern JavaScript frameworks.
  • Strong experience with AWS and/or Azure cloud platforms, including serverless architectures.
  • Hands-on experience integrating AI/ML capabilities, such as working with AI APIs like Azure OpenAI or AWS Bedrock.
  • Deep understanding of web architecture, microservices, and RESTful API design.
  • Proven ability to lead teams and engage directly with clients.

Responsibilities

  • Lead the architecture and design of modern web applications across diverse technology stacks.
  • Design and implement AI-enabled application features like intelligent search and automation workflows.
  • Serve as the primary technical interface to clients, translating needs into scalable solutions.
  • Ensure applications meet modern security standards and are highly performant.
  • Architect and deploy applications in AWS and Azure, focusing on scalability and cost efficiency.

Benefits

  • Opportunity to lead innovative projects in AI integration and web technologies.
  • Collaborative environment promoting continuous learning and mentorship.
  • Involvement in client engagements, shaping technical directions, and solution designs.
  • Potential for professional growth within fast-evolving AI and cloud-native technology sectors.
Full Job Description

We are seeking a highly experienced Senior Web Application Developer to serve as a technical leader, client liaison, and AI-enabled solutions engineer. This role requires a well-rounded full-stack background across modern web technologies, including but not limited to .NET/C#, JavaScript frameworks, cloud-native architectures, and emerging AI/ML integrations.

The ideal candidate brings 8+ years of experience building scalable web applications, combined with hands-on experience incorporating AI/ML capabilities (e.g., generative AI, APIs, or data-driven models) into production systems. This individual will act as a trusted advisor to clients, shaping technical direction while leading engineering teams to deliver innovative, secure, and high-performing solutions.

Primary Responsibilities

Full-Stack Architecture & Technical Leadership

  • Lead the architecture, design, and development of modern web applications across a diverse technology stack, including .NET/C#, Node.js, and front-end frameworks (React, Angular, Vue).
  • Design and implement scalable, cloud-native solutions using microservices and serverless architectures.
  • Establish and enforce engineering best practices, coding standards, and architectural patterns across teams.

AI/ML Integration & Intelligent Solutions

  • Design and implement AI-enabled application features, such as:
    • Integration with LLMs and AI APIs (e.g., Azure OpenAI, AWS Bedrock, or similar platforms)
    • Intelligent search, summarization, recommendation systems, or automation workflows
  • Collaborate with stakeholders to identify opportunities where AI can enhance user experience, decision-making, or operational efficiency.
  • Ensure responsible and secure use of AI technologies, including data privacy, governance, and model evaluation.

Client Engagement & Technical Strategy

  • Serve as a primary technical interface to clients, translating business needs into scalable technical solutions.
  • Lead solutioning sessions, architecture discussions, and technical briefings with stakeholders.
  • Provide strategic guidance on modern web technologies, cloud adoption, and AI integration.
  • Build strong client relationships as a trusted technical advisor.

Advanced Web Application & API Development

  • Oversee development of secure, high-performance web applications and RESTful APIs.
  • Ensure interoperability and cross-platform integration across systems.
  • Drive best practices in API design, versioning, and performance optimization.

Cloud & DevOps Enablement

  • Architect and deploy applications in AWS and Azure, leveraging serverless and containerized services.
  • Lead CI/CD pipeline implementation and DevSecOps practices.
  • Optimize systems for scalability, reliability, and cost efficiency in cloud environments.

Team Leadership & Mentorship

  • Mentor developers across multiple technology stacks, not limited to .NET.
  • Lead code reviews, architecture reviews, and technical decision-making.
  • Foster a culture of innovation, continuous learning, and engineering excellence.

Security, Performance & Quality

  • Ensure applications meet modern security standards, including secure API design and cloud security best practices.
  • Implement comprehensive testing strategies and performance monitoring.
  • Continuously improve system resilience, scalability, and maintainability.

UI/UX & Modern Web Practices

  • Collaborate with UI/UX teams to deliver responsive, accessible, and user-centric applications.
  • Drive adoption of modern front-end architecture and performance optimization techniques.

Innovation & Continuous Improvement

  • Stay current with emerging web and AI technologies, evaluating their applicability to client missions.
  • Introduce new tools, frameworks, and AI capabilities to improve delivery and innovation.

Basic Qualifications

  • Must be able to obtain a Public Trust prior to starting (US Citizenship Required).
  • Bachelor’s or Master’s degree in Computer Science, Information Technology, or related field (or equivalent experience).
  • 8+ years of experience in full-stack web application development, including .NET/C# and modern JavaScript frameworks.
  • Demonstrated experience working across multiple web technologies beyond .NET (e.g., Node.js, Python, or similar).
  • Strong hands-on experience with T-SQL, including writing and optimizing SQL queries, stored procedures, triggers, functions, and other database objects.
  • Demonstrated commitment to built-in quality, including developing reliable, maintainable, and well-tested solutions that meet performance, security, and coding standards.
  • Ability to follow development best practices, conduct code reviews, troubleshoot issues, and ensure deliverables meet quality expectations throughout the development lifecycle.
  • Hands-on experience integrating or developing AI/ML capabilities, such as:
    • Working with AI APIs (Azure OpenAI, AWS Bedrock, etc.)
    • Implementing data-driven or intelligent application features
  • Strong experience with AWS and/or Azure cloud platforms, including serverless architectures.
  • Deep understanding of web architecture, microservices, and RESTful API design.
  • Experience with SQL and NoSQL databases.
  • Proven ability to lead teams and engage directly with clients.
  • Strong communication skills with the ability to bridge business needs and technical solutions.
  • Knowledge of secure application development and cloud security practices.

Preferred Qualifications

  • Certifications in AWS, Azure, or AI/ML-related technologies.
  • Experience building or integrating generative AI solutions in production environments.
  • Familiarity with Python for AI/ML workflows.
  • Experience with DevSecOps, CI/CD pipelines, and automation tools.
  • Prior experience in client-facing technical leadership roles within complex or mission-driven environments.

AppMod

About Leidos Holding

Leidos Holding Careers

Joining Leidos Holding presents an unparalleled opportunity to advance one's career with a leader in innovation and technology. The company offers a plethora of job opportunities aimed at fostering professional growth and development in a diverse and inclusive environment.

Explore Career Opportunities

Leidos Holding is actively seeking skilled professionals who are passionate about leveraging their expertise to drive innovation and leadership in their fields. With a variety of open positions, Leidos Holding provides a platform for individuals to challenge themselves in a dynamic work environment.

Innovation and Professional Growth

At Leidos Holding, innovation is at the core of everything they do. Employees are encouraged to think creatively and push boundaries. The company supports this drive for innovation through comprehensive professional development and diversity training programs that are designed to enhance skills and foster leadership.

Commitment to Diversity and Inclusion

Leidos Holding is committed to creating a workplace where diversity is not only recognized but celebrated. With a culture that values and promotes diversity, Leidos Holding ensures that all team members have the opportunity to contribute, learn, and grow.

Internship Programs

For those starting their career, Leidos Holding offers internship programs that provide a robust foundation in the industry. Internships are a great way to develop essential skills, gain valuable work experience, and build professional networks.

Benefits and Culture

Employees at Leidos Holding enjoy a range of benefits designed to support their professional and personal lives. The company culture is built on a foundation of respect and integrity, providing a supportive and collaborative environment where every team member is valued.

Join the Team

Leidos Holding is hiring! Explore job opportunities that match your skills and interests. Leidos Holding looks for driven, curious, and innovative individuals to join their team. Positions are available across various disciplines and experience levels.

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To prepare for an interview at Leidos Holding, candidates should familiarize themselves with the company's missions and values, update their resumes, and be ready to discuss how their background and skills align with the position they are applying for.

Networking and Career Advancement

Leidos Holding encourages its employees to engage in networking within the company to discover new opportunities for career advancement. The leadership team at Leidos Holding is dedicated to supporting employees in their career paths with ample opportunities for networking and growth.

Explore Leidos Holding Jobs and Careers

Discover the exciting career opportunities at Leidos Holding today. With a commitment to employee growth, innovation, and diversity, Leidos Holding is the perfect place to advance your career. Check out the latest job listings and find your perfect fit at Leidos Holding.

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