Application Guide

How to Apply for Senior Backend Engineer (Elixir)

at In-Charge Energy

🏢 About In-Charge Energy

In-Charge Energy is uniquely positioned at the intersection of clean energy and transportation technology, specifically focused on commercial fleet electrification. Working here means contributing directly to reducing large-scale emissions through practical, scalable solutions rather than just theoretical environmental goals. The company's mission-driven focus on tangible impact makes it appealing for engineers who want their technical work to have clear environmental significance.

About This Role

As a Senior Backend Engineer at In-Charge Energy, you'll be building and maintaining the distributed Elixir/Phoenix systems that power electric vehicle fleet management solutions, with particular emphasis on GraphQL APIs for internal and external consumption. This role directly impacts the reliability and scalability of systems that manage real-world EV charging infrastructure, making your work critical to the company's core mission of accelerating transportation electrification.

💡 A Day in the Life

A typical day involves collaborating with product teams to refine GraphQL API specifications for new fleet management features, implementing Elixir services that process real-time charging data, participating in code reviews focused on maintainability and performance, and working with DevOps on scaling considerations for distributed systems. You'll balance independent deep work on backend services with collaborative sessions translating fleet operator needs into technical solutions.

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Interview Prep

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🎯 Who In-Charge Energy Is Looking For

  • Has 3+ years of production experience with Elixir/Phoenix/Ecto specifically, not just functional programming experience in other languages
  • Can demonstrate designing GraphQL APIs with clear documentation patterns, ideally showing examples of schema design decisions
  • Values simplicity in architecture and can articulate trade-offs between complex vs. maintainable solutions in distributed systems
  • Has experience collaborating with product/UX teams to translate fleet management requirements into technical specifications

📝 Tips for Applying to In-Charge Energy

1

Highlight specific Elixir/Phoenix projects where you designed scalable systems for real-time data processing, as this aligns with EV fleet monitoring needs

2

Prepare examples of GraphQL API designs you've implemented, including how you handled documentation and versioning

3

Mention any experience with energy, IoT, or transportation systems since this shows domain relevance beyond just technical skills

4

Be ready to discuss how you've balanced performance and security in distributed systems, as this is explicitly mentioned in the job description

5

Reference the company's mission in your application materials to show you understand their specific focus on commercial fleet electrification

✉️ What to Emphasize in Your Cover Letter

['Your hands-on experience with Elixir/Phoenix/Ecto in production environments (specifically 3+ years as required)', 'Examples of designing GraphQL APIs with clear documentation practices', 'How your approach to system architecture aligns with their stated values of simplicity and maintainability', "Why you're specifically interested in applying your backend skills to transportation electrification rather than just any tech company"]

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🔍 Research Before Applying

To stand out, make sure you've researched:

  • → In-Charge Energy's specific commercial fleet clients and partnerships to understand their real-world implementations
  • → The EV charging industry standards (like OCPP) that their systems likely need to interface with
  • → Their technology stack beyond what's mentioned (check their engineering blog or GitHub if available)
  • → Recent news about commercial fleet electrification trends to understand the market they're serving

💬 Prepare for These Interview Topics

Based on this role, you may be asked about:

1 Designing a GraphQL API for EV charging station status monitoring and fleet management
2 Elixir concurrency patterns for handling real-time data from distributed charging infrastructure
3 Security considerations for APIs that control physical EV charging equipment
4 Performance optimization strategies for Phoenix applications handling high-volume telemetry data
5 Collaborating with product teams to define requirements for fleet management features
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⚠️ Common Mistakes to Avoid

  • Focusing only on functional programming concepts without demonstrating specific Elixir/Phoenix production experience
  • Treating this as just another backend role without showing interest in their specific transportation electrification mission
  • Presenting overly complex architectural solutions when the job description specifically values simplicity and maintainability

📅 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 In-Charge Energy!

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