Sr. Android Developer

Android Full-Stack Engineer

📍 Location: Remote

💼 Type: Full-Time

💰 Salary: $800 - $1,000 USD / month

📩 Apply Now at: https://forms.gle/1XrseYnbCUsJDDuTA

About Us

At Momenta, we're committed to creating a safer digital world by protecting individuals and businesses from voice-based fraud and scams. Through innovative AI technology and community collaboration, we're building a future where communication is secure and trustworthy.

Position Overview

We’re looking for an experienced Android Full-Stack Developer to help us bring our user-facing Android app to life. You’ll work closely with our design and engineering teams to build out our map-based UI and integrate key features that power voice scam detection and reporting.

Key Expectations

📌 End-to-End Android Client

• Take our existing codebase from prototype to production-grade
• Implement core features: secure login flows, background call listeners (VoIP/SIP), real-time UI feedback on fraud scores, and call history dashboards
• Optimize across devices for CPU, memory, battery, and low-latency audio processing
• Handle permissions, call audio capture, and background service behavior
• Launch and manage app distribution via Google Play

📌 Serverless Backend & API Development

• Design, build, and maintain AWS-based microservices using Lambda, API Gateway, DynamoDB, and S3
• Implement endpoints for audio streaming, ML model inference (via AWS SageMaker or custom endpoints), and event logging
• Define REST/WebSocket contracts and integrate with Twilio or SIP gateways for VoIP call control

📌 Performance, Security, and DevOps

• Ensure real-time responsiveness and scalable audio data processing
• Implement robust CI/CD pipelines using Git and Gradle
• Build secure auth flows using OAuth/token-based authentication
• Apply best practices in encryption, permissions, and Android security architecture

📌 Cross-Team Collaboration

• Work closely with our CTO and product team to align implementation with roadmap
• Provide clear technical insights, raise blockers, and proactively recommend solutions
• Document backend services and client workflows for maintainability

Required Skills & Qualifications

🎯 Android Expertise

• Kotlin & Java, Android Studio, Jetpack libraries (WorkManager, Room, LiveData)
• Material Design, custom views, background services, and VoIP call handling
• Experience launching Android apps on Google Play

🎯 Backend & DevOps Proficiency

• AWS Lambda, API Gateway, DynamoDB, S3
• Node.js, Python, or similar backend experience
• REST and WebSocket API development
• CI/CD pipelines, Git, Gradle, Serverless Framework

🎯 VoIP & Audio Experience

• Familiarity with SIP/WebRTC, call audio capture, Twilio integrations
• Experience with background audio services and event-driven processing

🎯 Security & API Design

• OAuth/token-based auth
• Secure mobile data handling and encryption in transit
• Android permission model and security best practices

🎯 Bonus

• Experience with AWS SageMaker or deploying custom ML endpoints
• Prior experience with real-time event processing or analytics in telecom or fraud detection

Why Join Momenta?

Work on a real product with a clear mission—protecting users from voice scamsShip a full-stack mobile experience that will be used globallyCollaborate directly with founders and see your work go liveRemote-first, builder-led team with deep focus on product delivery

🚀 Apply now and help shape the future of voice security

Job Description-

We are looking for a React Native Lead interested in building performant mobile apps on both the iOS and Android platforms. You will be responsible for architecting and building these applications, as well as coordinating with the teams responsible for other layers of the product infrastructure. Building a product is a highly collaborative effort, and as such, a strong team player with a commitment to perfection is required.

Responsibilities

Build pixel-perfect, buttery smooth UIs across both mobile platforms. Leverage native APIs for deep integrations with both platforms. Diagnose and fix bugs and performance bottlenecks for performance that feels native. Reach out to the open source community to encourage and help implement mission-critical software fixes—React Native moves fast and often breaks things. Maintain code and write automated tests to ensure the product is of the highest quality. Transition existing React web apps to React Native.

Skills

Firm grasp of the JavaScript {​{​and TypeScript or ClojureScript}​}​ language and its nuances, including ES6+ syntax Knowledge of {​{​functional or object-oriented}​}​ programming Ability to write well-documented, clean Javascript code Rock solid at working with third-party dependencies and debugging dependency conflicts Familiarity with native build tools, like XCode, Gradle {​{​Android Studio, IntelliJ}​}​ Understanding of REST APIs, the document request model, and offline storage Experience with automated testing suites, like {​{​Jest or Mocha}​}​

TeamExtn is looking for a passionate Android Developer. It will be expected from you to build pragmatic solutions on mission-critical initiatives for a Fortune 500 company in the silicon valley. If you know your stuff, see the beauty in code, have knowledge in depth and breadth, advocate best practices, and love to work with distributed systems, then this is an ideal position for you.

Responsibilities:

You will build advanced cross-platform consumer and enterprise mobile applications.

Additionally:

• Participate end to end in the product life cycle: requirements gathering, solution design, development, testing, and implementation
• Be actively involved in interpreting analytics and customer data to improve the user experience.
• Collaborate with Carvana's Engineering, Creative Marketing and Customer Advocate teams.

Required Skills And Experience:

• 4+ years experience in Android development
• Proficiency in Java and/or Kotlin
• Experience with REST web services.
• Built or contributed to at least one Android app
• Experience with third party libraries and APIs
• Understanding of multithreading principles and best practices
• Strong debugging and troubleshooting skills
• Good communication and collaboration skills

Bonus Skills:

• Continuous integration experience with mobile apps
• Automotive industry experience

Interview Process:

We schedule a technical round that can go up to 2 hours, where we have technical discussions plus remote pairing sessions.

We double-check the potential team member is a culture fit. Culture fit is as important to us as writing code. Once we know that you are a great fit, we discuss and finalize numbers on the same call. You will have three days to take up the offer.

TeamExtn is a niche software consulting agency to implement pragmatic solutions that believes in getting the work done more than talking big. Come and join us in our growth journey.

Location: 

Mumbai Preferred
remote is an option

Android Developer: 

Position: Android/Java/Kotlin Developer 

 - Selected candidate is required to be a part of the product development team and have to manage both maintenance and enhancement projects & building Mobile Applications using web services. 

Skills & Expertise we look for: 

1. Should be passionate about user interface design and have skills in Native Android with proficiency in Kotlin and Java. 
2. Out of the box thinking to troubleshoot and solve problems 
3. Should be willing to implement latest technology trends like XML/Compose UI, MVVM pattern, Livedata, Data binding, Pagination, Coroutines and other Jetpack components. 
4. Should be able to analyze customer requirements, estimate the effort, provide the deliverable date to the customer and make sure to ship the feature on time 
5. Experience in Release management like creating, merging, maintaining branches, versioning and releasing apps. Should have experience in publishing apps to play store. 
6. Ready to help team members in their technical challenges 
7. Collaborate with cross-functional teams to define, document, design, and ship new features

Personality we expect: 

1. You love an Agile work culture and deliver as per plan  
2. You're a lively person who's passionate on what you do  
3. You're a nonstop learner and enjoy sharing the learning to your juniors 
4. You're socially connected with the team and helping others team voluntarily. 
5. You're tech- expertise and effective in tools operation automate the regular process. 
6. You're someone who loves problem-working by seeing the occasion in every challenge and you enjoy learning from failures  
7. Honestly share your experience, feedback, challenges, learning and emotions for the day in your daily diary. 
8. Think of user needs instead of system needs