ICF is seeking a Senior Appian Developer with strong experience supporting complex Appian environments, custom plugin development, and application modernization initiatives. The ideal candidate will have a proven ability to lead technical solution development, support large-scale plugin remediation efforts, and guide modernization activities associated with evolving Appian platform capabilities. This role requires deep technical expertise, strong collaboration skills, and the ability to mentor development teams while supporting delivery within fast-paced Agile environments.

Responsibilities:

Appian Development & Plugin Conversion

• Design, develop, enhance, and maintain complex Appian applications supporting enterprise business processes and operational workflows
• Lead remediation, conversion, and modernization efforts for custom Appian plugins to ensure compatibility with updated Appian platform standards
• Analyze legacy plugin implementations and recommend scalable modernization approaches and technical improvements
• Troubleshoot and resolve complex technical issues involving Appian applications, integrations, custom plugins, and infrastructure dependencies
• Collaborate with architects and technical leadership to define solution approaches, development standards, and modernization strategies
• Support Appian platform upgrades and associated remediation activities across development, testing, and production environments

Technical Leadership & Architecture Support

• Provide technical leadership, mentorship, and guidance to development teams supporting Appian modernization initiatives
• Participate in architecture discussions, technical design reviews, code reviews, and implementation planning activities
• Develop and maintain reusable components, shared frameworks, and integration standards to improve delivery efficiency and maintainability
• Ensure development activities align with security requirements, coding standards, and Appian best practices
• Support integration efforts involving APIs, web services, databases, and external enterprise systems
• Assist with performance optimization, scalability improvements, and operational stability initiatives

Agile Delivery & Cross-Functional Collaboration

• Participate in Agile ceremonies including sprint planning, backlog refinement, sprint reviews, and retrospectives
• Collaborate closely with Scrum Masters, Business Analysts, QA teams, architects, and stakeholders to support successful delivery outcomes
• Assist with technical estimation, release planning, dependency management, and risk identification activities
• Support troubleshooting, root cause analysis, and resolution of complex production or deployment issues
• Promote continuous improvement across development workflows, delivery processes, and technical standards

Modernization, Innovation & Knowledge Transfer

• Support long-term modernization strategies within complex Appian environments
• Identify opportunities to improve maintainability, operational stability, automation, and delivery efficiency
• Stay current on Appian platform updates, emerging technologies, and modernization best practices
• Support knowledge-sharing and mentoring initiatives across the broader Appian practice
• Provide technical guidance and knowledge transfer related to emerging Appian AI capabilities, including AI-assisted workflows and platform features where applicable
• Assist leadership in evaluating future modernization opportunities involving Appian AI and related platform capabilities

Required Skills:

• 6+ years of professional software development experience
• Bachelor's degree
• 4+ years of hands-on Appian development experience
• 4+ years of experience supporting Appian application development within Agile software delivery environments
• 4+ years of experience troubleshooting and supporting Appian applications in self-managed/on-premises Linux environments, including navigating Appian installations and reviewing application and server logs to diagnose issues.
• 4+ years of experience supporting complex integrations involving APIs, web services, databases, and external systems
• 4+ years of experience utilizing Git/GitLab and modern source control workflows
• US Citizenship or Green Card is required (required by the federal government for this position).
• Must be able to obtain Public Trust clearance.
• MUST RESIDE IN THE United States (U.S.) and the work MUST BE PERFORMED in the United States (U.S.), as this work is for a federal contract and laws do apply.

Preferred Skills:

• Appian Certified Senior Developer or Appian Certified Lead Developer certification
• Strong understanding of Appian platform operations and the ability to investigate and resolve platform issues across Linux-hosted Appian environments.
• Strong experience developing, maintaining, or modernizing custom Appian plugins using Java
• Strong understanding of software architecture, secure coding principles, and software development lifecycle practices
• Strong proficiency with SQL and relational database concepts
• Strong analytical, troubleshooting, and problem-solving skills with the ability to diagnose and resolve complex technical issues
• Excellent written and verbal communication skills
• Ability to work independently while mentoring and collaborating effectively across cross-functional Agile teams
• Experience leading Appian modernization, platform upgrade, or plugin remediation initiatives
• Experience developing enterprise-scale Appian solutions within federal government or public sector environments
• Familiarity with CI/CD pipelines, Jenkins, Docker, Kubernetes, or containerized deployment approaches
• Experience supporting AWS-hosted or cloud-native application environments
• Strong experience with REST/SOAP integrations, API development, and enterprise integration patterns
• Exposure to Appian AI capabilities, AI Skills, AI Copilot, AI Document Processing, AI Agents, or other emerging Appian platform features
• Hands-on experience implementing or evaluating Appian AI capabilities strongly preferred
• Experience supporting technical knowledge transfer and mentoring initiatives across development organizations
• Experience contributing to architecture governance, technical standards, or modernization strategy efforts

Bot and Third-Party Applications

Please note that this application must be submitted directly by the applicant for consideration. Failure to do so may result in the application being excluded for consideration. Applicants needing an accommodation for disability or religious purposes in connection with the application process should contact [redacted] for assistance.

Pay Range - There are multiple factors that are considered in determining final pay for a position, including, but not limited to, relevant work experience, skills, certifications and competencies that align to the specified role, geographic location, education and certifications as well as contract provisions regarding labor categories that are specific to the position.

The pay range for this position based on full-time employment is:
$98,614.00 - $167,644.00

Nationwide Remote Office (US99)