Mid-Senior Application Developer

Trillium Professional is now seeking a Mid-Senior Full-Stack Developer (.NET & Android) in Allentown, NJ!

Trillium Professional is seeking a Mid-to-Senior level Application Developer to join our engineering team. This is a high-impact role where you will bridge the gap between robust backend systems and mobile accessibility. You won’t just be writing code; you will take end-to-end ownership of scalable cloud solutions and serve as a technical pivot point for complex system architecture.

• Design and maintain robust backend applications utilizing the .NET ecosystem (C#, ).
• Build and support high-performance Android applications using Kotlin and/or Java.
• Lead decisions on application architecture and integrate RESTful APIs with various third‑party services.
• Partner with Dev Ops to deploy and monitor applications within modern cloud environments (Azure or AWS).
• Act as the final escalation point for complex production issues, diagnosing root causes and implementing long-term stability fixes.
• Troubleshoot connectivity and configuration for applications that interface with specialized physical devices and IoT environments.
• Guide junior engineers through code reviews and technical knowledge sharing while contributing to Agile sprint planning.
• Maintain high-quality standards and adhere to all company safety protocols and operational procedures.

Annual salary is $115-135k/year. 7:30a-4p/8a-4:30p shifts available.

• 4–7+ years of professional software engineering experience.
• Expert-level C# and .NET Framework (experience with .NET 6+ modernization is a major plus).
• Proven track record of developing and maintaining Android applications; experience publishing to the Google Play Store is preferred.
• Strong SQL Server skills and a deep understanding of REST APIs, JSON, and application security.
• Hands‑on experience with Azure (App Services, Functions) or AWS (EC2, S3).
• Exposure to hardware-integrated systems, networking, or solutions engineering.
• Bachelor’s degree in Computer Science, Information Technology, or a related field (or equivalent professional experience).

Trillium is an Equal Opportunity Employer.