Senior Full Stack Developer (Kotlin + Spring Boot + Node.js + AWS)

WalTech International Inc.

A fast-growing US-based company building smart RV control systems, IoT devices, and AI-powered applications. Our products are used across North America by RV manufacturers and end customers.

About the Senior Role:

We are NOT looking for a task finisher or a developer who only works on assigned tickets. We are hiring a Lead — someone who can see the big picture, make the right technical decisions, and lead our product forward with ownership and vision.

Senior Full Stack Developer

key role for our growing team

• Own the complete development lifecycle of mobile and backend features
• Collaborate directly with the founders and engineering team
• Make architectural decisions for Android, backend, and middleware systems
• Build scalable systems that connect hardware, cloud, and mobile

take initiative, solve problems independently

Key Responsibilities:

Android Development:

• Lead Android app development using

  Kotlin + Jetpack Compose

• Implement

  MVVM architecture

  , data handling, and clean UI practices
• Integrate REST APIs, manage local storage with Room, and optimize app performance
• Work on MQTT communication with hardware-connected devices

Backend API & Middleware Development:

• Build scalable backend APIs using

  Spring Boot (Java)

  with proper security/authentication
• Design and maintain

  Node.js middleware

  for real-time data processing
• Optimize API performance, manage data flow between app, cloud, and IoT devices
• Follow clean coding, documentation, and structured backend design

Cloud Deployment & Integration:

• Deploy backend and middleware services on

  AWS EC2, Lambda, API Gateway

• Handle cloud deployment best practices, security, and scalability
• Manage system monitoring and basic DevOps tasks when required

Leadership & Collaboration:

• Work directly with hardware, firmware, and app teams for seamless integration
• Lead by example — mentor junior developers if needed
• Participate in system design discussions and propose improvements
• Take ownership of assigned projects and deliver on time

What We Expect You to Bring:

• 5+ years of Android development experience (Kotlin, MVVM, REST APIs)

• 3+ years of backend API development experience with Spring Boot (Java)

• Hands-on experience with Node.js for middleware systems

• AWS deployment experience — EC2, Lambda, API Gateway

• Exposure to

  MQTT or IoT device communication

• Strong problem-solving skills, leadership mindset, and initiative-taking attitude
• Good communication skills and remote work discipline
• Willingness to explore AI integration and smart system design

What You’ll Get:

• Fully Remote Role with Flexible Working Hours

• Salary Range: As per Industry Standard

• Direct impact on international product lines and IoT solutions
• Freedom to innovate and grow your skills in AI, IoT, and cloud technologies
• Opportunity to grow with a fast-paced international team