Application Guide

How to Apply for Senior Embedded Software Engineer

at IONATE

ðŸĒ About IONATE

IONATE is pioneering intelligent transformers that enable smart grids for a sustainable energy transition, blending power electronics with digital intelligence. Unlike traditional grid companies, they're at the intersection of hardware innovation and software control systems for renewable energy integration. Working here means contributing directly to decarbonizing energy infrastructure with cutting-edge technology.

About This Role

This Senior Embedded Software Engineer role involves developing real-time firmware from scratch for ARM Cortex-M microcontrollers in grid-connected inverters, ensuring hard timing constraints and safety compliance for smart grid applications. You'll be responsible for bringing up new hardware platforms, troubleshooting firmware-hardware faults in field deployments, and implementing control algorithms within strict latency budgets. This position directly impacts the reliability and intelligence of transformers that enable renewable energy integration into power grids.

ðŸ’Ą A Day in the Life

A typical day might involve developing embedded software for grid-connected inverters on ARM Cortex-M platforms, collaborating with hardware engineers to debug a peripheral integration issue, and reviewing timing budgets for a new control algorithm implementation. You could spend the afternoon troubleshooting a field-reported firmware issue in a test rig, then participate in a design discussion about safety compliance requirements for an upcoming deployment.

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Interview Prep

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ðŸŽŊ Who IONATE Is Looking For

  • Has shipped production firmware for complex real-time systems (not just prototypes) with experience through the full lifecycle from development to field support
  • Demonstrates deep expertise in bare-metal and RTOS-based programming on ARM Cortex-M, with proven ability to manage memory, peripherals, interrupts, and debug low-level hardware-software issues
  • Possesses experience with grid-connected applications or power electronics where safety requirements and regulatory compliance (like grid codes) are critical
  • Can show concrete examples of collaborating with hardware engineers and control specialists to define interfaces and timing budgets for embedded systems

📝 Tips for Applying to IONATE

1

Highlight specific ARM Cortex-M projects where you developed real-time firmware from scratch, quantifying timing constraints (e.g., 'met 50Ξs interrupt latency requirements')

2

Demonstrate experience with grid-connected systems or power electronics in your resume, even if tangential - mention any work with inverters, transformers, or energy applications

3

Prepare examples of troubleshooting firmware-hardware faults in field deployments, not just lab environments, showing how you reproduced and fixed issues without disrupting systems

4

Show your understanding of safety processes and regulatory standards for grid applications - mention specific standards if you have experience with them

5

Emphasize collaboration with hardware engineers and control specialists in past roles, providing concrete examples of interface definition or validation strategies you contributed to

✉ïļ What to Emphasize in Your Cover Letter

['Your experience developing real-time embedded systems for deployed products (not just prototypes), specifically mentioning ARM Cortex-M and timing constraints', 'Examples of bringing up new hardware platforms and integrating sensors/actuators for complex systems', "Understanding of grid-connected applications and safety requirements, showing awareness of IONATE's smart grid mission", 'Collaboration experience with hardware engineers and control specialists on embedded system interfaces and validation']

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🔍 Research Before Applying

To stand out, make sure you've researched:

  • → IONATE's specific intelligent transformer technology and how it differs from traditional transformers
  • → Smart grid challenges in the UK energy transition and how digital control systems address them
  • → Regulatory standards for grid-connected inverters and transformers in the UK/Europe
  • → IONATE's recent projects or partnerships in the sustainable energy space

💎 Prepare for These Interview Topics

Based on this role, you may be asked about:

1 Walk through your process for designing and implementing real-time firmware from scratch on ARM Cortex-M, including how you determine interrupt priorities and manage memory
2 Describe a time you troubleshooted a firmware-hardware fault in a field deployment - how you reproduced it, analyzed logs, and delivered a robust fix
3 How do you ensure firmware meets hard timing constraints and safety requirements for grid-connected applications?
4 Explain your experience with bare-metal vs RTOS-based applications and when you choose each approach
5 Discuss how you've collaborated with hardware engineers and control specialists to define interfaces and timing budgets for embedded systems
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⚠ïļ Common Mistakes to Avoid

  • Focusing only on high-level software development without demonstrating low-level embedded systems experience with microcontrollers
  • Presenting only academic or prototype projects without evidence of shipping and supporting firmware in deployed products
  • Failing to show understanding of real-time constraints and safety requirements specific to grid-connected or power electronics applications

📅 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 IONATE!

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