Application Guide

How to Apply for Android Developer

at 75F

🏢 About 75F

75F is a predictive IoT company uniquely focused on reducing building energy consumption through smart HVAC and lighting control, directly addressing climate impact. Their mission-driven approach combines IoT technology with environmental sustainability, making it appealing for developers who want their work to have tangible environmental benefits. The company operates at the intersection of hardware, software, and cloud systems in the growing smart buildings sector.

About This Role

This Android Developer role involves building the next-generation IoT gateway application that runs algorithms for smart buildings and connects to cloud systems, directly contributing to significant energy savings in HVAC infrastructure. You'll be designing, implementing, and testing features for an Android application that serves as a critical bridge between building systems and cloud analytics, working in a scaled agile environment across time zones with interdisciplinary teams.

💡 A Day in the Life

A typical day involves collaborating with cloud engineers on API integrations, implementing new algorithms for HVAC optimization in Kotlin, writing tests using JUnit and Espresso for gateway functionality, and participating in agile ceremonies with team members across different time zones. You might also troubleshoot field issues with the Android application and contribute to documentation for new features that help buildings reduce energy consumption.

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Interview Prep

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🎯 Who 75F Is Looking For

  • 8+ years of professional Android development experience with at least 4 years specifically in Kotlin, demonstrating deep expertise in both Java and Kotlin for Android/Linux platforms
  • Strong background in developing algorithms and applications for IoT or embedded systems, with experience in Android SDK, RESTful APIs, and the open-source Android ecosystem
  • Proven experience with testing frameworks (JUnit, Espresso, Roboelectric) and build tools (Gradle, Maven), plus experience collaborating with cloud and firmware engineering teams
  • Background in writing technical documentation, participating in field problem resolution, and working in agile environments across different time zones

📝 Tips for Applying to 75F

1

Highlight specific IoT or smart building projects in your portfolio, especially those involving Android as a gateway device or algorithms for environmental control systems

2

Quantify your energy savings or efficiency improvements in previous roles if you've worked on similar sustainability-focused applications

3

Demonstrate your 4+ years of Kotlin experience with concrete examples of Kotlin-specific features you've implemented (coroutines, extension functions, etc.)

4

Showcase experience working with interdisciplinary hardware/software teams and mention any experience with HVAC, building automation, or environmental control systems

5

Include examples of how you've contributed to software methodologies and documentation in previous roles, as this is explicitly mentioned in the job description

✉️ What to Emphasize in Your Cover Letter

["Your specific experience with Android as a gateway device in IoT systems and how it relates to 75F's smart building focus", "Examples of algorithms you've developed for resource optimization or environmental control that demonstrate your fit for their energy-saving mission", 'Your experience collaborating with cloud and firmware engineering teams in distributed environments', 'How your background in both Java and Kotlin (with 4+ years in Kotlin) prepares you for their technical stack requirements']

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🔍 Research Before Applying

To stand out, make sure you've researched:

  • → 75F's specific IoT architecture and how their Android gateway fits into their overall smart building ecosystem
  • → The company's recent projects or case studies showing energy savings achieved through their technology
  • → The competitive landscape of smart building technology and 75F's position within it
  • → Their technology stack beyond Android - what cloud platforms and firmware systems they integrate with

💬 Prepare for These Interview Topics

Based on this role, you may be asked about:

1 Designing Android applications that serve as gateways between local hardware (HVAC systems) and cloud services
2 Implementing algorithms for energy optimization in building systems while maintaining occupant comfort
3 Testing strategies for IoT applications running on Android/Linux platforms in field environments
4 Collaboration challenges when working with firmware and cloud engineering teams across different time zones
5 Secure coding practices for IoT applications that control critical building infrastructure
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⚠️ Common Mistakes to Avoid

  • Presenting only generic Android app development experience without highlighting IoT, gateway, or algorithm development aspects
  • Failing to demonstrate the required 4+ years of Kotlin experience with specific examples and best practices
  • Not showing understanding of how Android applications interact with hardware systems in IoT environments

📅 Application Timeline

This position is open until filled. However, we recommend applying as soon as possible as roles at mission-driven organizations tend to fill quickly.

Typical hiring timeline:

1

Application Review

1-2 weeks

2

Initial Screening

Phone call or written assessment

3

Interviews

1-2 rounds, usually virtual

✓

Offer

Congratulations!

Ready to Apply?

Good luck with your application to 75F!

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