Mid-Senior Application Developer

▶ Apply Mid-Senior Application Developer Allentown, New Jersey

• Posted on May 8, 2026 Published By Laura Sweeney 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. Key Responsibilities

• Full-Stack Development:

  Design and maintain robust backend applications utilizing the .NET ecosystem (C#, VB.NET).

• Mobile Innovation:

  Build and support high-performance Android applications using Kotlin and/or Java.

• System Architecture:

  Lead decisions on application architecture and integrate RESTful APIs with various third-party services.

• Cloud Operations:

  Partner with DevOps to deploy and monitor applications within modern cloud environments (Azure or AWS).

• Technical Problem Solving:

  Act as the final escalation point for complex production issues, diagnosing root causes and implementing long-term stability fixes.

• Hardware-Software Synergy:

  Troubleshoot connectivity and configuration for applications that interface with specialized physical devices and IoT environments.

• Leadership & Mentorship:

  Guide junior engineers through code reviews and technical knowledge sharing while contributing to Agile sprint planning.

• Compliance & Safety:

  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. Apply now! Qualifications & Technical Profile

• Experience:

  4-7+ years of professional software engineering experience.

• Core Tech:

  Expert-level C# and .NET Framework (experience with .NET 6+ modernization is a major plus).

• Mobile Tech:

  Proven track record of developing and maintaining Android applications; experience publishing to the Google Play Store is preferred.

• Database & API:

  Strong SQL Server skills and a deep understanding of REST APIs, JSON, and application security.

• Cloud Proficiency:

  Hands-on experience with Azure (App Services, Functions) or AWS (EC2, S3).
• The "Systems Thinker": Exposure to hardware-integrated systems, networking, or solutions engineering.

•

Education:

Bachelor's degree in Computer Science, Information Technology, or a related field (or equivalent professional experience). Trillium has been recruiting and placing professionals for over 30 years. From Fortune 100 companies to small businesses, our philosophy remains the same: to achieve excellence by providing quality employees and an uncompromising level of service. We believe in honesty, integrity, and a simple philosophy of providing value to our customers and our employees. We strive to be unsurpassed in the recruitment and placement of quality and skilled professionals. Trillium is an Equal Opportunity Employer. Qualified applications with arrest or conviction records will be considered for employment in accordance with the Los Angeles County Fair Chance Ordinance for the employers and the California Fair Chance Act. By applying to this job, I agree to receive electronic communications including SMS text and email regarding future opportunities, referral bonus incentives, and other promotions from Trillium. You may opt out at any time from future communications by responding STOP to any electronic communication. You may view our full privacy policy at https://trilliumstaffing.com/jobs/privacy/ . Trillium offers a comprehensive benefit package that includes the ability to participate in health insurance and retirement plans, paid holidays, state required leave, and other leave, if applicable. Trillium's offerings are dependent on the state in which the assignment is located, length of time worked, and may change depending on assignment. Benefit packages for direct hire placements vary based on the client company. Want to apply for Mid-Senior Application Developer? To apply for Mid-Senior Application Developer enter your email address below. If you have an account with indeed.com, you can also Apply with Indeed Contact Us if you have any questions Contact Laura Sweeney (248) 237-3127 Have a question about this job? Our intentions are to fill job vacancies as quickly as possible with qualified candidates. We are always accepting applications if a time sensitive job has an application deadline it is noted in the job description. Click on "Apply" to begin the apply process.