Sr. Appian Software Developer

Leidos; Washington (Washington County); On-site; USD 108,000 - 195,000; Full time

Job summary

Leidos is seeking a Senior Appian Software Engineer with 10+ years of software development lifecycle experience to design and deliver complex Appian solutions. You will build process models, SA IL interfaces, and AI-enabled features while integrating with REST/SOAP APIs and microservices.

The role requires hands-on Appian development, Java plugins, and strong collaboration within Agile teams. Experience with cloud platforms (AWS) and container orchestration (Kubernetes) is preferred; federal

Qualifications

• Bachelors or Masters with relevant experience required; strong written and verbal communication.
• Ability to work independently and collaborate within cross-functional Agile teams.
• Experience supporting Appian upgrades, plugin remediation, or modernization initiatives.
• Experience with Appian Data Fabric and data migrations from SQL Server or MariaDB.
• Experience developing Appian plugins using Java; familiarity with CI/CD pipelines (Jenkins, Docker).
• Experience with AWS-hosted or cloud environments and container orchestration (Kubernetes).
• Exposure to Appian AI capabilities and related features; DoD or federal government experience is a plus.

Responsibilities

• Design and deliver Appian process models, SA IL interfaces, records and reports.
• Develop robust system integrations (REST/SOAP APIs, microservices) connecting Appian with disparate data sources.
• Work in Agile/Scrum delivery environments; utilize CI/CD pipelines and Git/GitLab for source control.
• Support Appian platform upgrades, plugin remediation, or modernization initiatives.
• Leverage Appian Data Fabric and contribute to knowledge transfer across teams.

Skills

Appian design and development

APIs (REST/SOAP)

Agile/Scrum

Git/GitLab

CI/CD pipelines

Jenkins

Docker

Kubernetes

AWS

Appian AI capabilities

Federal government experience

Strong communication

Independent work

Data Fabric

Education

Bachelor's Degree in Computer Science or related field

Master's Degree with 6–10 years experience

Tools

Jenkins

Docker

Kubernetes

AWS

Java plugins for Appian

Git/GitLab

Job description

Looking for an opportunity to make an impact?

At Leidos, we deliver innovative solutions through the efforts of our diverse and talented people who are dedicated to our customers’ success. We empower our teams, contribute to our communities, and operate sustainable. Everything we do is built on a commitment to do the right thing for our customers, our people, and our community. Our Mission, Vision, and Values guide the way we do business.

If this sounds like the kind of environment where you can thrive, keep reading!

The Digital Modernization Sector brings together our digital transformation and IT programs, allowing us to better serve our customers through scale and repeatability.

Your greatest work is ahead!

We are looking for Senior Appian Software Engineer with 10 plus experience of software development lifecycle practices and secure coding principles.

Experience with design and delivery of complex Appian process models, SAIL (Self-Assembling Interface Layer) interfaces, records, reports, and Appian AI capabilities

Experience with API development and design and development of robust system integrations (REST/SOAP APIs, microservices) connecting Appian with disparate federal agency databases and legacy systems

5+ years of dedicated, hands‑on Appian design and development experience with active Senior Developer or Lead Developer certifications

Experience operating within Agile/Scrum delivery environments, utilizing CI/CD pipelines and Git/GitLab for source control. The candidate must have:

• Bachelors Degree in Computer Science, Software Engineering or related field or Masters Degree and 6 to 10 years of related experience. Additional years of experience may be accepted in lieu of degree requirement.
• Strong written and verbal communication skills
• Ability to work independently and collaborate effectively within cross‑functional Agile teams
• Experience supporting Appian platform upgrades, plugin remediation, or modernization initiatives
• Experience with implementing Appian’s Data Fabric
• Experience with data and system migrations from SQL Server or Maria Database
• Experience developing or maintaining custom Appian plugins using Java
• Familiarity with CI/CD pipelines, Jenkins, Docker, or containerized deployment approaches
• Experience supporting AWS-hosted or cloud‑based application environments
• Exposure to Kubernetes or container orchestration platforms
• Exposure to Appian AI capabilities, AI Skills, AI Copilot, AI Document Processing, or other emerging Appian platform features
• Experience supporting federal government
• Experience contributing to knowledge transfer and cross‑team collaboration initiatives within technical organizations

Preferred Skills

• Prior background in C# and full‑stack .NET development, highly desired for custom API building and legacy system migrations.
• Hands‑on experience implementing Appian AI Copilot, AI Skills, or Intelligent Document Processing (IDP).
• Prior delivery experience within federal civilian or DoD environments
• Appian Senior Developer or Lead Developer Certification

If you’re looking for comfort, keep scrolling. At Leidos, we outthink, outbuild, and outpace the status quo — because the mission demands it. We’re not hiring followers. We’re recruiting the ones who disrupt, provoke, and refuse to fail. Step 10 is ancient history. We’re already at step 30 — and moving faster than anyone else dares.

Original Posting:

June 29, 2026

For U.S. Positions: While subject to change based on business needs, Leidos reasonably anticipates that this job requisition will remain open for at least 3 days with an anticipated close date of no earlier than 3 days after the original posting date as listed above.

Pay Range:

Pay Range $107,900.00 - $195,050.00

The Leidos pay range for this job level is a general guideline onlyand not a guarantee of compensation or salary. Additional factors considered in extending an offer include (but are not limited to) responsibilities of the job, education, experience, knowledge, skills, and abilities, as well as internal equity, alignment with market data, applicable bargaining agreement (if any), or other law.