East Penn Manufacturing - Deka Batteries Software Engineer interview questions & guide 2026

The questions below represent the patterns observed in our technical hiring process. While specific inquiries will vary based on your team and seniority, you should be prepared to discuss your technical problem-solving process, your experience with industrial or embedded systems, and your ability to work within a manufacturing culture.

Technical & Domain Knowledge

• These questions test your grasp of embedded systems, communication protocols, and your ability to apply software principles to hardware environments.
  • How do you handle real-time constraints in embedded firmware development?
  • Can you explain your experience with communication protocols like CAN, SPI, or I2C in a production environment?

Preparation at East Penn Manufacturing - Deka Batteries is about demonstrating both technical depth and a practical, "hands-on" mindset. We look for engineers who are comfortable stepping out of the office and onto the plant floor to understand how their software interacts with the real world.

Technical Competency – We expect a strong foundation in embedded systems, firmware architecture, and communication protocols. You should be ready to discuss trade-offs in your design choices, such as why you chose a particular language or architecture over another.

System-Level Thinking – It is not enough to write clean code; you must understand the system it lives in. Be prepared to explain how your software impacts hardware reliability, safety, and manufacturing throughput.

Cross-Functional Collaboration – You will work closely with mechanical, electrical, and process engineers. Demonstrate your ability to translate technical requirements into actionable software tasks and your skill in communicating progress to stakeholders at all levels.

Process & Quality Focus – We operate in a highly regulated environment. Show us that you understand the importance of version control, testing methodologies, and adherence to safety standards like functional safety guidelines.

Our interview process is designed to be thorough and collaborative. We prioritize getting to know you as both an engineer and a potential teammate. You can expect a series of discussions that move from initial screenings to deeper technical dives, often involving team members from different engineering disciplines. We value a process that is transparent, allowing you to learn as much about us as we learn about you.

The rigor of our process reflects our commitment to the safety and quality of our products. You should expect to be challenged on your technical knowledge, but also to engage in meaningful conversations about our culture, our history as a family-owned business, and your own long-term career aspirations.

This timeline provides a high-level view of our standard progression. Candidates should use this as a guide to manage their preparation energy, ensuring they are ready for both technical assessments and behavioral discussions. Note that the process can be adapted based on the specific requirements of the role and the urgency of the project.

Embedded Firmware & Architecture

• We evaluate your ability to architect firmware that is stable, scalable, and secure. Strong performance includes a mastery of real-time systems and a proactive approach to error handling.
• Be ready to go over:
  • Real-time operating systems (RTOS) and task scheduling.
  • Memory management in resource-constrained environments.

System Integration & Communication

• Software rarely acts in isolation here. We look for your ability to integrate code with hardware sensors, actuators, and communication buses.
• Be ready to go over:
  • Mastery of protocols like CAN, CANOpen, J1939, SPI, and I2C.
  • Hardware-software interface design (HAL).
  • Diagnostic and logging strategies for field troubleshooting.
• Advanced concepts: Implementing diagnostic UDS services or handling high-frequency data acquisition from battery cells.
• Example scenarios: "How do you handle bus arbitration in a high-traffic CAN network?" or "Describe how you would debug a communication mismatch between an MCU and a sensor."

As a Software Engineer, your day-to-day work is centered on the lifecycle of our energy storage products. You will be responsible for the full-stack development of firmware, from initial concept and requirements gathering to validation and manufacturing integration. You will act as a technical steward for our codebases, ensuring that our software is not only functional but also maintainable and compliant with industry standards.

Collaboration is the heartbeat of this role. You will work alongside mechanical, electrical, and process engineering teams to define system architectures and ensure seamless hardware-software integration. You will also play a key role in the continuous improvement of our manufacturing processes, often developing tools that monitor production metrics, analyze performance data, and implement corrective actions. Expect to participate in regular technical reviews and occasional field or plant-floor visits to see your designs in action.

To be competitive, you should possess a strong blend of technical expertise and a "get-it-done" attitude. We value candidates who have a solid academic foundation and a proven track record of applying that knowledge to complex, real-world problems.

• Must-have skills: Proficiency in embedded C/C++, deep understanding of microcontroller architectures, and hands-on experience with communication protocols.
• Nice-to-have skills: Experience with battery management systems (BMS), familiarity with functional safety standards, and knowledge of scripting languages like Python for testing or data analysis.
• Soft skills: Strong communication abilities to bridge the gap between technical and non-technical teams, a proactive problem-solving mindset, and the ability to work independently while remaining a collaborative team player.

Q: What is the typical timeline from an initial screen to an offer? A: While timelines can vary, we aim for a structured process that moves efficiently once we find the right match. You can generally expect the cycle to last a few weeks, depending on interview availability.

Q: How much does East Penn value prior experience in the battery or automotive industry? A: While domain experience is highly beneficial, we also value strong engineers from adjacent fields like industrial automation or robotics who demonstrate a quick ability to learn and apply their skills to our specific challenges.

Q: What is the culture like for engineers at East Penn? A: We are a family-owned enterprise that prioritizes long-term relationships. Our culture is characterized by an open-door management policy, a commitment to employee development, and a collaborative environment where cross-functional teamwork is the norm.

Q: Is there an opportunity for growth and advancement? A: Absolutely. With a massive, growing footprint and a commitment to investing in our people, we offer numerous pathways for career progression, whether in individual technical leadership or into management roles.

• Understand the "Why": Beyond knowing how to code, understand why we use specific protocols or safety measures. We value engineers who think about the broader impact of their design choices.
• Be Ready for the Floor: Our best engineers are those who are comfortable in a manufacturing environment. Highlight any experience you have working directly with hardware or in production settings.
• Own Your Mistakes: In your technical discussions, be honest about bugs or project challenges you've faced. We are more interested in your troubleshooting process and what you learned than in a perfect resume.
• Prepare for Behavioral Questions: Use the STAR method (Situation, Task, Action, Result) to structure your answers, focusing on your specific contribution to team success.

Joining East Penn Manufacturing - Deka Batteries as a Software Engineer offers you the chance to work at the intersection of traditional manufacturing excellence and modern digital innovation. This is a role where your technical skills will directly contribute to the safety, efficiency, and performance of products that have a global impact. By focusing your preparation on system-level thinking, robust firmware architecture, and cross-functional collaboration, you will be well-positioned to demonstrate the value you can bring to our team.

We encourage you to approach your interview with confidence and curiosity. You can explore additional interview insights, practice questions, and preparation resources on Dataford to sharpen your readiness. We look forward to seeing how your expertise and passion can help us continue our legacy of innovation.

The provided compensation data reflects competitive industry standards for this role. Candidates should interpret these ranges as a baseline, keeping in mind that total compensation at East Penn Manufacturing - Deka Batteries includes a comprehensive benefits package, retirement contributions, and the stability of a long-standing, family-owned organization.