Sr. Software Developer

What if the software you developed directly enabled some of the nation's most critical missions? As a Senior Software Developer, you'll do more than write exceptional code, you'll help build innovative, secure, and scalable solutions that support Intelligence Community operations. If you're passionate about modern software engineering, enjoy collaborating in Agile teams, and thrive on solving complex technical challenges, Leidos wants to hear from you.On the Maru Program, you’ll join a high-performing team where your ideas are valued, your technical expertise is trusted, and your work has a tangible impact. Working alongside software engineers, architects, DevSecOps engineers, cybersecurity professionals, and mission stakeholders, you'll develop next-generation applications that deliver mission-critical capabilities in a fast-paced Agile environment.This is your opportunity to build cutting-edge software while contributing to work that truly matters.What You'll DoAs a Senior Software Developer, you'll play a key role in designing, developing, testing, and deploying secure, scalable applications that support enterprise and mission operations.Please note Gaithersburg, MD is the program’s primary work location.Clearance Level Required:Active Top Secret/SCI with the ability to successfully pass a Polygraph examination.Primary Responsibilities:Design, develop, test, deploy, and maintain enterprise software applications using modern development practices.Collaborate with Product Owners, Scrum Masters, architects, and fellow developers to deliver high-quality software in Agile sprints.Participate in sprint planning, backlog refinement, daily stand-ups, sprint reviews, and retrospectives.Develop clean, maintainable, and well-documented code following secure coding standards and best practices.Design and implement RESTful APIs, microservices, and distributed application architectures.Perform code reviews and mentor junior developers to promote engineering excellence and knowledge sharing.Troubleshoot complex application issues and perform root cause analysis to improve system reliability and performance.Develop automated unit, integration, and end-to-end tests to ensure software quality.Collaborate with DevSecOps teams to implement CI/CD pipelines and automated deployment processes.Optimize application performance, scalability, and security across enterprise environments.Participate in architecture discussions and contribute to technical roadmaps and modernization initiatives.Support production deployments and resolve issues in mission-critical environmentsRequired Qualifications:US citizenship is required per contract.Bachelor's degree in Computer Science, Software Engineering, or related field and 8-12 years of prior relevant experience or Master’s with 6-10 years of prior relevant experience.8+ years of professional software development experience.Strong proficiency in one or more object-oriented programming languages such as:JavaC#PythonC++Experience developing web-based applications and enterprise software solutions.Experience designing and consuming REST APIs.Experience working with relational and/or NoSQL databases.Strong understanding of object-oriented design principles and software design patterns.Experience using Git or other distributed version control systems.Experience working within Agile Scrum or SAFe development environments.Excellent analytical, debugging, and problem-solving skills.Strong written and verbal communication skills.Preferred Qualifications:Experience developing cloud-native applications in AWS, Azure, or other cloud platforms.Experience with containerization technologies such as Docker and Kubernetes.Experience building microservices architectures.Familiarity with DevSecOps practices and CI/CD tools including Jenkins, GitLab CI, or Azure DevOps.Experience with Infrastructure as Code tools such as Terraform or Ansible.Knowledge of message brokers such as Kafka or RabbitMQ.Experience with front-end frameworks such as React, Angular, or Vue.js.Familiarity with Elasticsearch, Redis, or other enterprise technologies.Experience with secure software development lifecycle (SSDLC) practices.Security+ certification or other DoD 8570/8140 compliant certification.#Maru#NSBAIf 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:August 6, 2026For 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 - $195,050.00The Leidos pay range for this job level is a general guideline only and 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.SummaryLocation: Gaithersburg, MDType: Full time