New 
Java Developer - Senior
 Spectraforce Technologies | |
 United States, Texas, Southlake | |
 Oct 07, 2026 | |
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Title: Java Developer - Senior
Location: ** Candidates will work on-site 4 days per week. ** Southlake preferred location ** Backup location is Ann Arbor ** This is a Contract -to- Hire position. Duration: 12 Months Our Client is seeking a Senior Java Developer to join the thinkorswim Performance Engineering team. This role independently plans and delivers performance and resiliency initiatives for a Java-based trading platform, with a focus on latency, scalability, reliability, and resiliency. The developer builds workloads and tools, identifies code and system bottlenecks, and recommends improvements across client, server, gateway, infrastructure, and cloud environments. This role requires deep Core Java knowledge and strong diagnostic skills. The developer reads source code, analyzes JVM and system behavior, and understands production traffic. They turn findings into code, configuration, capacity, and design recommendations. Key Responsibilities - Responsible for coding performance test scripts in Core Java, develop and maintain Unix shell and Python based framework - Develop custom tooling, creating mock services and maintenance of the tool repository - Gather and analyze performance requirements in collaboration with project owners and stakeholders - Support in writing performance test plans, executing performance tests, monitor application behavior, analyze and identify code-level performance bottlenecks. - Identify and collect key system performance metrics - Address client-side and server-side performance issues and recommend performance and resiliency enhancements and tuning - Support in providing solutions for production monitoring - Understand the complex code base quickly and be able to work within ambiguous design constraints. - Develop deeper understanding of architecture to identify unique solutions to provide the best client experience in a scalable way - Work with the Performance QA team on test runs to stress the capabilities of the system and identify bottlenecks at the code level Required Qualifications - Bachelor's degree in computer science or engineering. - 5+ Years of Java, J2EE(client and server side) , Spring framework, Spring Boot and Spring cloud development experience. - 5+ Years of Experience with distributed systems/software, real time processing, relational database systems, messaging systems - Linux background with experience in shell scripting - Strong experience with concurrency & multi-threading - Understanding of data structures, algorithms, and design patterns - Experience with troubleshooting/diagnosing JVM issues (e.g. thread dumps, garbage collection and memory management) - Experience with resiliency implementations - CircuitBreakers, Shapers, LoadBalancers & Failover - Experience with Java-based, high-throughput, low-latency, real-time systems - Good experience in using Splunk, Grafana (or other monitoring tools) - Strong analytical, organizational and problem solving/decision making skills - Have knowledge of professional software engineering practices, best practices for the full software development life cycle, including coding standards, code reviews, source control management, build processes, testing, and operations - Highly motivated, self-starting individual who can take effective independent decisions. - Excellent analytical and problem-solving skills. Provides analysis of problems, evaluate alternatives, and provides solutions that are consistent with business objectives and strategy. Preferred Qualifications - Experience in the Financial Services industry is strongly preferred - Experience with trading platforms is a big plus - DevOps and build automation experience - Experience working with cloud computing platforms, including AWS and Google Cloud - Usage of AI tools with Visual Studio/ Idea IntelliJ is a plus | |