Application Engineer ESS (all genders)

Overview

Application Engineer ESS (all genders) role at A123 Systems.

Shaping the future of energy storage. At A123 Systems, we are driving the transition to cleaner, more efficient energy solutions with advanced lithium ion storage technologies. Our battery systems offer superior energy density, safety and durability, helping vehicle manufacturers achieve performance while reducing environmental impact. We provide energy storage systems (ESS) to optimize energy use, support renewable integration and provide reliable backup power.

We are looking for Product Engineer - Energy Storage Systems (ESS) (all genders) for our team.

Job Purpose
Product Engineer for Energy Storage Systems is a key contributor to the technical series support of current and upcoming projects. The Product Engineer will work in a global cross‑functional matrix organization including systems, hardware, software, mechanical, validation, etc., for energy storage system deployment. This includes coordinating the efforts of team members and third‑party contractors to sustain battery products according to plan and customer expectations. The Product Engineer will execute the project’s technical objectives and oversee quality control throughout its life cycle. The focus is on battery-based energy storage system solutions ranging from residential PV installations to multi-modular HV container solutions for grid stabilization and industrial applications.

Job Responsibilities

• Serves as the primary technical interface between customers and A123\'s internal multi‑functional engineering and quality teams
• Responsible for technical series development and support across the product life cycle
• Coordinate and report on issues arising during the lifecycle
• Maintain scheduled engineering deliveries, updates and bug fixes with support from the global engineering team
• Organize regular cross‑departmental meetings, including preparation and follow‑up
• Coordinate mitigation and improvement actions with internal development departments
• Support new product development with product specification, coordination of cell/module/package development, evaluation of life cycle behavior, and collaboration to continuously improve products
• Support the acquisition of new projects by maintaining strong customer relationships and confidence in A123 products

Education & Experience

• Completed engineering degree in electrochemical engineering, industrial engineering, electrical engineering, or equivalent (Master's degree)
• 5+ years of engineering experience preferred
• Battery system and/or grid application/PV industry experience preferred
• Familiar with battery system development through battery validation, mechanical design, thermal management, and also BMS, EMS, PCS
• Solid problem‑solving and troubleshooting skills, including experience leading a triage team

Knowledge, Skills, And Abilities

• Basic understanding of program management, quality, and manufacturing operations
• Ability to identify customer needs and translate them into a successful business proposal
• Strong communication and presentation skills
• Creative thinker who takes full accountability
• Team player who thrives in a start‑up culture with developing policies and procedures
• Outwardly enthusiastic and self‑motivated
• Excellent English language skills; fluent German is a plus

We Offer

• Flat hierarchies and creative freedom: Your ideas count and your work has a direct impact.
• Team spirit: A supportive, warm atmosphere with helpful colleagues.

Onboarding & Development

• Comprehensive onboarding: Induction plan, mentoring and support from the start.
• Career development: Continuous training, individual career planning and global project work.

Benefits

• Attractive salary package with notebook and mobile phone
• 30 days holiday per year for good work‑life balance
• Company pension scheme
• Group accident insurance
• Corporate benefits
• Urban Sports membership
• E‑bike leasing discount
• Home office options

Senioritiy level

• Mid‑Senior level

Employment type

• Full‑time

Job function

• Engineering and Information Technology
• Industries: Renewable Energy Equipment Manufacturing

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