> Markdown version of [/jobs/ext/239779-sr-software-developer](https://www.wearedevelopers.com/jobs/ext/239779-sr-software-developer). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Sr. Software Developer - **Company:** Oasys Inc. - **Location:** Fairfax, VA, United States - **Experience:** Expert - **Contract:** Permanent contract - **Skills:** HTML, Java (Programming Language), JavaScript (Programming Language), PHP (Programming Language), Amazon Web Services, HTML5, Cascading Style Sheets (CSS), Cloud Computing, Cloud Engineering, Program Optimization, Code Review, Databases, Continuous Integration, DevOps, Distributed Systems, Fault Tolerance, Web Servers, Java Platform Standard Edition (J2SE), Performance Tuning, Software Architecture, Queueing Systems, Cloud Services, Standard Sql, SQL Databases, Zend Framework, Cloud Platform System, Delivery Pipeline, Caching, Backend, Information Technology, Api Design, Api Gateway, Restful APIs, Microservices - **Published:** May 19, 2026 - **Apply:** https://www.indeed.com/viewjob?jk=5f48a2523da3f8b1 ## About the Role * Bachelor's degree in computer science or a technical field * 10+ years developing complex support applications with proven leadership in legacy software rebuilds * 10 years working in Java Standard Edition 11 * 10 years AWS and Cloud computing experience * Front and back-end development knowledge in JAVA, HTML, SQL, CSS * Experience in cloud computing. * Excellent communication and management skills. Certifications Preferred: * Microsoft Certified Solutions Developer (MCSD) * Zend PHP Certified Engineer * Microsoft Certified Solutions Expert (MCSE) Security Clearance Requirements: * Must be a U.S. Citizen * Must have an active DoD Secret clearance. ## Description The Senior Software Developer role requires a deep expertise in Java SE 11, strong full-stack skills, and hands-on experience in architecting and deploying applications on Amazon Web Services (AWS). This role focuses on building scalable, secure, cloud-native systems using AWS best practices. The role will drive technical strategy, mentor engineers, and shape high-impact cloud solutions for the DoD on AWS GovCloud. This role emphasizes backend architecture, distributed systems, API development, and cloud-native engineering, while also leveraging full-stack fundamentals (HTML, CSS, SQL) to deliver end-to-end solutions. NOTE: This role is contingent on the contract being awarded, * Architect, design, and implement backend services, microservices, and RESTful APIs using Java SE 11. * Leverage Java SE 11 capabilities (e.g., var, enhanced HTTP Client, modern JVM improvements) to build efficient and maintainable components. * Design efficient data models and schemas using SQL * Contribute to front-end integration using HTML5, CSS3, and foundational JavaScript. * Develop secure, high-availability distributed systems aligned with AWS best practices. * Implement robust error handling, caching strategies, and performance optimizations across backend services. * Integrate with databases, message queues, API gateways, and third-party systems * Apply AWS Well-Architected Framework principles to ensure operational excellence, security, reliability, performance, and cost efficiency. * Conduct in-depth code reviews, provide technical mentorship, and drive engineering best practices. * Optimize systems for performance, observability, monitoring, security, and fault tolerance. * Work closely with DevOps teams to build and maintain CI/CD pipelines, deployment workflows, and cloud-based infrastructure. * Support operations and sustainment activities. * All other duties as assigned by management. ## Related Videos - [The Resilience of the World Wide Web](https://www.wearedevelopers.com/videos/1281-the-resilience-of-the-world-wide-web) - [Let developers develop again](https://www.wearedevelopers.com/videos/463-let-developers-develop-again) - [From DevOps to Scaled DevOps: How We’re Rebuilding Continuous Delivery as a Platform](https://www.wearedevelopers.com/videos/100018-from-devops-to-scaled-devops-how-we-re-rebuilding-continuous-delivery-as-a-platform) - [Security Pitfalls for Software Engineers](https://www.wearedevelopers.com/videos/726-security-pitfalls-for-software-engineers) - [DevOps Maturity Check – a way to balance autonomy and alignment](https://www.wearedevelopers.com/videos/58-devops-maturity-check-a-way-to-balance-autonomy-and-alignment) - [Can SVG be fast? Rendering a scatter chart with over 10k points](https://www.wearedevelopers.com/videos/100299-can-svg-be-fast-rendering-a-scatter-chart-with-over-10k-points) ## Related Articles - [Is Software Engineering Over-Saturated?](https://www.wearedevelopers.com/magazine/418-is-software-engineering-over-saturated) - [What’s the Difference between a Junior, Mid, and Senior Developer?](https://www.wearedevelopers.com/magazine/238-what-s-the-difference-between-a-junior-mid-and-senior-developer) - [7 Important Tips That Every Software Developer Should Know](https://www.wearedevelopers.com/magazine/101-7-important-tips-that-every-software-developer-should-know) - [Highest Paying Tech Companies for Developers](https://www.wearedevelopers.com/magazine/220-highest-paying-tech-companies-for-developers) - [The Best Software Developer Blogs to Read](https://www.wearedevelopers.com/magazine/156-the-best-software-developer-blogs-to-read) - [What Are The Top Skills Required For Azure Developers?](https://www.wearedevelopers.com/magazine/77-what-are-the-top-skills-required-for-azure-developers)