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# Senior Full Stack Engineer

- **Company:** System One
- **Location:** Reston, VA, United States (Remote available)
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** Java (Programming Language), Application Programming Interfaces (APIs), Amazon Web Services, Component-Based Software Engineering, Information Systems, Databases, Distributed Systems, HP Systems Insight Manager, HP Loadrunner, Apache JMeter, PostgreSQL, Load Testing, Performance Tuning, Cloud Services, Standard Sql, Software Engineering, Java Application Server, Enterprise Software Applications, Performance Testing, Database Optimization, Software Troubleshooting, Gatling, Indexer, Backend, Information Technology, Data Analytics, Cloudwatch, Splunk, Code Restructuring, Dynatrace, Microservices
- **Published:** October 14, 2026
- **Apply:** https://www.techcareers.com/job.asp?id=3445747645&tx=FJ6562FFI&pt=1&aff=0B19D771-A501-4A5E-8338-2A822B784D54&utm_source=Job%20Feed&utm_medium=textkernel&utm_campaign=DE&utm_term=0B19D771-A501-4A5E-8338-2A822B784D54

## About the Role

* 5+ years of full stack software engineering experience with hands-on development, troubleshooting, and application improvement.
 * Strong Java development skills, especially for backend services, APIs, and performance tuning.
 * Hands-on performance engineering experience, including developing, maintaining, and executing performance and load test scripts.
 * Ability to identify performance bottlenecks across systems, microservices, APIs, databases, and cloud services.
 * Strong troubleshooting and root cause analysis skills, with the ability to translate findings into actionable remediation recommendations.
 * Experience profiling and refactoring application code to address performance, scalability, and resource utilization issues.
 * Strong PostgreSQL and SQL skills, including query analysis, execution plans, indexing, and database performance tuning.
 * Hands-on experience with AWS, including investigating and tuning application and cloud configurations affecting performance.
 * Experience with microservices and distributed applications, including tracing transactions and dependencies across services.
 * Experience with performance testing and application monitoring tools such as JMeter, LoadRunner, Gatling, Dynatrace, Splunk, CloudWatch, or comparable technologies.
 * Ability to establish performance baselines, analyze test results and application metrics, implement or recommend remediation, and retest to demonstrate improvement.
 * Working knowledge of front-end technologies to investigate performance issues across the full application stack.
 * Strong communication skills to explain performance findings, root causes, and remediation recommendations to development and technical teams.
 * Financial services or other large-scale, highly regulated enterprise application experience is preferred.
 * Educational Requirements: Bachelor's degree in computer science, Information Systems, Software Engineering, or a related field.

## Description

* Develop and execute end-to-end performance tests, analyze application behavior, and identify bottlenecks across integrated systems, microservices, databases, and AWS services.
 * Investigate performance issues beyond the testing layer, determine root causes, and recommend or implement appropriate remediation.
 * Tune and refactor Java applications, optimize PostgreSQL queries, review AWS configurations, and work across application components to improve overall system performance.
 * Retest after remediation to validate improvements and provide clear, data-driven recommendations for additional changes., System One, and its subsidiaries including Joulé, ALTA IT Services, CM Access, TPGS, and MOUNTAIN, LTD., are leaders in delivering workforce solutions and integrated services across North America. We help clients get work done more efficiently and economically, without compromising quality. System One not only serves as a valued partner for our clients, but we offer eligible full-time employees health and welfare benefits coverage options including medical, dental, vision, spending accounts, life insurance, voluntary plans, as well as participation in a 401(k) plan.