> Markdown version of [/jobs/ext/4625423-senior-staff-engineer-java-kotlin](https://www.wearedevelopers.com/jobs/ext/4625423-senior-staff-engineer-java-kotlin). 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).

---

# Senior Staff Engineer- Java & Kotlin

- **Company:** ApTask
- **Location:** Jersey City, NJ, United States
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** Java (Programming Language), Artificial Intelligence, Algorithmic Trading, Continuous Integration, Data Integrity, Programming Tools, Distributed Systems, Monitoring of Systems, MongoDB, OpenShift, Transact-SQL, Grafana, Kotlin, Event Driven Architecture, Containerization, Kubernetes, Information Technology, Apache Kafka, Legacy Systems
- **Published:** November 7, 2026
- **Apply:** https://www.thejobnetwork.com/job/4364142c-3ec3-4aaf-afed-04e0b78c0b33/senior-staff-engineer-java-kotlin

## About the Role

* Strong Java expertise, with Kotlin experience or willingness to learn.
\n

 * Hands-on experience with event-driven architecture, messaging, and distributed systems.
\n

 * Strong TDD practices and experience with CI/CD and iterative delivery.
\n

 * Proven ability to modernize complex legacy systems and work independently in production environments.
\n

 * Bachelor's degree in Computer Science or a related field.
\n, * Experience in Prime Brokerage, Equity Swaps, or Cash Equities.
\n

 * Strong SQL Server, T-SQL, Kafka, and MongoDB skills.
\n

 * Familiarity with Kubernetes/OpenShift, cloud-native technologies, and monitoring tools such as OpenTelemetry, ELK, and Grafana.
\n

 * Knowledge of corporate actions, regulatory reporting, and risk/valuation systems.
\n

 * Experience using AI-assisted and agentic development tools.
\n

## Description

We are seeking a Senior Java/Kotlin Engineer. The role involves upgrading legacy trading systems to event-driven, cloud-native architecture while ensuring high performance, data integrity, and stability in a live production environment.