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# Senior Software Engineer - Backend

- **Company:** Eliassen Group
- **Location:** Springfield, IL, United States (Remote available)
- **Experience:** Expert
- **Salary:** $140,000.0 - $160,000.0
- **Contract:** Permanent contract
- **Skills:** Java (Programming Language), Big Data, Data Systems, Relational Databases, Software Design Documents, Distributed Systems, Performance Tuning, Software Engineering, SQL Databases, Multithreading, Real Time Systems, Concurrency, Backend, Event Driven Architecture, Build Management, Build Tools
- **Published:** August 6, 2026
- **Apply:** https://dejobs.org/x/x/7E3B568098994B0CB6CA213386E5EE4D/job/

## About the Role

* 5-10+ years of backend software engineering experience, with Java preferred.
 * Strong expertise in Java backend development, multi-threading and concurrency, and system design with distributed systems concepts.
 * Experience with large-scale or high-volume data systems and data-intensive applications or pipelines.
 * Proficiency with SQL and relational databases, including querying, schema design, and performance tuning.
 * Demonstrated ability to build systems that operate at scale and high throughput and to contribute effectively in a fast-paced, collaborative environment.
 * Strong problem-solving, communication, and teamwork skills.
 * Strongly preferred: experience with data-heavy or real-time systems, performance optimization, high-throughput applications, and familiarity with distributed systems or event-driven architectures. Exposure to time-series or industrial data is a plus.

## Description

* Own the full lifecycle of features from design through deployment and support.
 * Design and build scalable, high-performance backend systems.
 * Improve code architecture with a focus on performance, scalability, and maintainability.
 * Write and review technical design documentation.
 * Work with large, complex datasets and ensure data accuracy at scale.
 * Collaborate closely with engineering teams to solve complex system challenges.
 * Conduct thoughtful, high-quality code reviews.
 * Mentor and support other engineers on the team.
 * Contribute to improving engineering standards and team velocity.


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