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# Senior Back End Engineer in Mundelein

- **Company:** Energy Jobline
- **Location:** Mundelein, IL, United States
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** Java (Programming Language), Artificial Intelligence, Continuous Integration, MongoDB, OpenShift, Performance Tuning, Transact-SQL, Trunk-based Development, Multithreading, Test-Driven Development (TDD), Grafana, Kotlin, Event Driven Architecture, Kubernetes, Apache Kafka, Event Sourcing, Code Restructuring, Legacy Systems
- **Published:** October 19, 2026
- **Apply:** https://www.energyjobline.com/job/senior-back-end-engineer-mundelein-31997869

## About the Role

* Expert-level Java, with Kotlin experience or a clear appetite for it (enterprise-grade systems, multi-threading, performance).
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 * Practical experience designing and building event-driven systems on message-passing and event-sourcing patterns, including failure handling, ordering guarantees and replay semantics.
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 * Test-Driven Development as a practice, not an aspiration: you own quality end-to-end, you design for testability, and you can demonstrate it through how you approach a problem (this is assessed at interview).
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 * Hands-on experience in or alongside a capital markets trading or post-trade environment: the trade lifecycle, trade booking and position management, and post-trade operations such as cashflow calculation, settlement and wires, client reporting, and accounting principles. You should be able to back this up with concrete examples, not high-level familiarity.
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 * A track record in genuine iterative delivery incl. short feedback loops, trunk-based development, CI/CD, and regular zero-downtime production releases. No waterfall projects labelled as agile.
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 * Proven ability to analyse, refactor and modernise large-scale legacy systems while maintaining stability.
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 * Senior-level autonomy: you contribute to design discussions, push back constructively on technical decisions, and operate with minimal supervision in a complex production environment.
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## Description

This is a senior, delivery-focused engagement on a strategic multi-year programme. It suits an engineer who is proactive about building deep domain knowledge, holds themselves to high engineering standards without needing an external quality gate, and is comfortable being challenged by (and challenging) a strong internal engineering team. This is a chance to join a prestigious finance-focused software consulting firm and help modernise systems at the heart of a global Prime Finance business. You'll build valuable domain knowledge and collaborate with talented engineers., * Understanding of Prime Brokerage, Synthetic (Swap) or Cash Equity operational flows. This is a significant advantage.
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 * Familiarity with corporate actions, regulatory reporting obligations (e.g. 871(m), EMIR, MiFID), and integrating with risk/valuation systems in an equities context.
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 * Strong SQL Server depth: T-SQL, schema design, performance tuning and complex data models in high-transaction environments.
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 * Kafka (or comparable event-streaming platforms) at scale, and MongoDB.
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 * Kubernetes/OpenShift deployment and cloud- operational practices, with observability via OpenTelemetry, ELK and Grafana.
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 * Demonstrated AI-first development experience: agentic coding workflows for legacy analysis, refactoring and test , with a clear-eyed view of where the tools help and where they don't.
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