> Markdown version of [/jobs/ext/3935530-lead-developer-java-onsite](https://www.wearedevelopers.com/jobs/ext/3935530-lead-developer-java-onsite). 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).

---

# Lead Developer / Java / Onsite

- **Company:** Kelly Services Inc.
- **Location:** Philadelphia, PA, United States
- **Experience:** Expert
- **Salary:** $160,000 - $180,000
- **Contract:** Permanent contract
- **Skills:** Java (Programming Language), Java Virtual Machine (JVM), Web Services, Concurrency, Information Technology
- **Published:** October 26, 2026
- **Apply:** https://www.phillyjobs.com/job.asp?id=3467343159&tx=FK3936FFF&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

They are seeking deep expertise in Core Java to work on mission-critical, real-time infrastructure. This is not a framework, web services, or cloud role - candidates with that background will not be the right fit. To succeed here, you need a strong command of JVM internals, concurrency, and performance-focused engineering in high-throughput, low-latency environments. This is an environment where technical depth is genuinely valued and rewarded, with strong compensation, excellent benefits, and clear pathways for growth., * 10+ years of experience in Core Java development

 * Deep understanding of JVM internals
 * Strong command of multithreading and concurrency
 * At least a BS in Computer Science or related field

Desired Skills & Experience

 * Industry experience
 * MS or PhD