Introduction
Are you a Senior Java Developer who takes pride in writing clean, scalable, and high-performance code? Here’s a high-priority, long-term contract opportunity in O’Fallon, Missouri, designed for experienced developers who thrive in enterprise-scale environments.
This is not just another coding job—you’ll play a key role in architecting distributed systems, optimizing performance, and leading development initiatives using modern cloud-native technologies.
If you’re ready to work onsite in a collaborative, high-energy team and take ownership of critical systems, this could be your next big career move.
About the Company
This opportunity is featured by DevDirectly in collaboration with Appian Infotech, a trusted IT consulting and staffing firm known for delivering top-tier talent to enterprise clients.
Appian Infotech specializes in:
- Enterprise software development
- Cloud-native solutions
- Data engineering and integration
- Long-term contract staffing
The end client is a large-scale enterprise organization focused on building high-performance, distributed applications.
Job Role & Responsibilities
As a Senior Java Developer, you will act as both a technical leader and system architect, contributing across the entire software development lifecycle.
🔥 Key Responsibilities:
1. Architecture & System Design
- Design scalable, distributed systems
- Build efficient and reusable system architectures
- Simplify complex libraries and create common interfaces
2. Backend Development
- Develop applications using Java (J2EE, Java 11/17+)
- Build and maintain RESTful APIs and microservices
- Ensure high performance and reliability
3. Data & Messaging Systems
- Work with Oracle SQL for data management
- Implement event-driven systems using:
- Kafka
- NATS
- NiFi
4. Cloud & Deployment
- Deploy applications using:
- AWS / Azure
- PCF (Pivotal Cloud Foundry)
- Ensure cloud-native scalability
5. Code Quality & Leadership
- Conduct code reviews and enforce best practices
- Apply SOLID, DRY, and Single Responsibility principles
- Mentor junior developers
- Drive performance optimization and testing strategies
Eligibility Criteria
🎓 Education:
- Bachelor’s degree in Computer Science, IT, or related field
🧑💻 Experience Required:
- Minimum 8+ years of experience in Java development
- Strong background in enterprise application development
Required Skills
🔧 Core Technical Skills:
- Strong expertise in Java (J2EE, Java 11/17+)
- Experience with Spring Boot and Microservices
- Proficiency in REST API development
- Strong knowledge of Oracle SQL
⚙️ Advanced Skills:
- Messaging systems: Kafka, NATS, NiFi
- Cloud platforms: AWS / Azure
- Deployment tools: PCF (Pivotal Cloud Foundry)
- NoSQL databases: Cassandra, Redis
- Monitoring tools: Splunk
💡 Soft Skills:
- Strong leadership and mentoring ability
- Problem-solving mindset
- Excellent communication skills
- Ability to work in cross-functional teams
Salary & Benefits
💰 Estimated Pay:
- $65 – $95 per hour (based on experience)
🎁 Benefits:
- Long-term contract stability
- Opportunity to work on enterprise-scale systems
- Exposure to modern cloud-native technologies
- Leadership role with high impact
- Career growth in backend architecture
Work Location & Environment
📍 Location: O’Fallon
🏢 Work Model:
- 100% Onsite (5 days a week)
🌐 Work Environment:
- Collaborative and high-performance team
- Focus on innovation and system scalability
- Strong engineering culture
- Hands-on leadership role
This role is ideal for developers who enjoy working closely with teams onsite and solving complex problems in real time.
Selection Process
The hiring process includes:
- Resume Screening
- Technical Interview (Java + Architecture)
- Coding/Problem-Solving Round
- In-Person Interview (Mandatory)
- Offer Release
⏱️ Timeline: 1–2 weeks
How to Apply
This is an urgent requirement—apply immediately if you meet the criteria.
📩 Apply via Email:
📌 Subject Line:
Application: Senior Java Developer – O’Fallon – [Your Name]
📋 Steps:
- Update your resume with Java and architecture experience
- Highlight microservices and cloud projects
- Mention your availability and location
- Send your application
Important Dates
- 📅 Application Start: Open Now
- ⏳ Last Date: Until filled
- ⚡ Joining: Immediate / Urgent
Important Links
- 📧 Apply Now: ashutosh.m@appianinfotech.com
Tips for Candidates
✅ Resume Tips:
- Highlight microservices architecture experience
- Showcase Kafka / event-driven systems projects
- Mention cloud deployment experience
- Include measurable performance improvements
✅ Interview Preparation:
Focus on:
- Core Java and concurrency
- System design and scalability
- REST API best practices
- Messaging systems (Kafka)
✅ Pro Tip:
Be ready to explain:
“How would you design a distributed system handling millions of events per second?”
Common Mistakes to Avoid
❌ Ignoring system design preparation
❌ Not showcasing cloud experience
❌ Weak understanding of messaging systems
❌ Poor communication in leadership discussions
❌ Sending generic resumes
FAQ Section
1. Is this a remote role?
No, this is a 100% onsite role in O’Fallon, Missouri.
2. What experience is required?
Minimum 8+ years of Java development experience.
3. What are the key tools required?
Java, Spring Boot, Kafka, Oracle SQL, and cloud platforms.
4. Is cloud experience mandatory?
Yes, experience with AWS or Azure is important.
5. Is there an in-person interview?
Yes, a mandatory in-person interview is part of the process.
6. Is this a leadership role?
Yes, it is a Senior/Lead-level position.
Conclusion
If you’re a passionate Senior Java Developer who enjoys building scalable systems and leading technical initiatives, this O’Fallon onsite opportunity is a perfect match.
With cutting-edge technologies, strong team collaboration, and high-impact work, this role offers everything needed to elevate your career.
📩 Apply today and become a key contributor to enterprise-scale innovation!