Senior Software Engineer (C++/C)

1001 LEGO System A/S; Billund; Hybrid; DKK 900,000 - 1,100,000; Full time

Benefits offered by this job

Family Care Leave

Life and disability insurance

Wellbeing programs

Colleague discount

Bonus scheme

Job summary

LEGO System A/S in Billund seeks a Senior Software Engineer to design and build high‑performance core engines and software platforms for play experiences. You’ll own engine components, work across technical teams, and focus on reliability and efficiency on constrained hardware.

You will collaborate with engineers and system architects to balance user experience with technical constraints, contributing to design discussions and maintaining robust software quality in a hybrid work environment.

Qualifications

• Experience in designing and building high‑performance core engines and software platforms.
• Ability to analyse complex technical problems and communicate engineering trade-offs clearly.
• Strong software development skills in C++/C and DSL usage.

Responsibilities

• Design, implement, and optimize core engine components for play experiences.
• Collaborate with Lead Engineer and architects to ensure scalable, robust platform foundations.
• Participate in code reviews, testing, and documentation to maintain engineering standards.
• Identify opportunities to improve development workflows and software quality.

Skills

Engine development

Performance optimization

C/C++

Tools

Jira

GitHub

Job description

Job Description Expert in building game play features and developing engine tech? Then get your application ready, we're looking for you! Play Software drives technology enabled play; where LEGO play sets are combined with electronic hardware and software to build a Play experience. As part of the Play Experience team, you will be a central part of the Play Software organization as we drive to bring advanced technology in-house, working across all technical teams, while always focusing on the experience of LEGO fans of all ages.

Responsibilities

We are looking for a Senior Software Engineer with strong expertise in designing and building high-performance core engines and software platforms. You will design and develop software components that enables the teams to create engaging play experiences using physical capabilities such as motion, sound and colour detection. Through robust and reusable software, you will help bring our tech-enabled toys to life. You will take ownership of key engine components, solve complex challenges in the system. Work closely with Lead Engineer and other stakeholders, you will help establish a robust and maintainable foundation for future capabilities. Design, implement, maintain and optimize core engine through software components. Take ownership of complex technical challenges, hands‑on in implementation, testing and resolving issues across the platform stack. Optimise performance, resource utilisation and reliability in constrained systems, identifying bottlenecks and challenges, and implementing effective solutions. Contribute to technical design discussions, evaluate implementation trade‑offs and recommend improvements to the architecture and software components. Maintain high engineering standards through code reviews, automated testing, documentation and continues integration practices. Collaborate closely with Engineering Leads and System Architects from the Software and Firmware domains to ensure your work is optimized and efficient on physical platforms. Identify opportunities to improve engineering processes, development workflows to enhance team efficiency and software quality.

Requirements

Strong software engineering experience in developing complex system, core platforms, frameworks or engines. Demonstrated ability to analyse complex technical problems, make engineering trade-offs and communicate decisions clearly. Strong software development skills, fluent in C++/C. Experience with Domain Specific Languages (DSL). Demonstrated track record of successfully delivering engineering projects within team, achieving objectives and milestones. Demonstrate ability to balance user experience and technical constraints to deliver effective solutions. Experience in using task management software like Jira. Experience using GitHub for code management.

Nice to have

Nice to have: Experience with connected toys, wearables, IoT or other hardware-software products (BLE, NFC/RFID, sensors, low‑power devices). Experience with game engines (Unity, Unreal, Godot) and building designer‑facing tools and data‑driven content pipelines. Audio programming or interactive sound design experience. Experience designing play for children, including playtesting with kids and working within child safety and privacy regulations. A passion for LEGO play and a curiosity for inventing new forms of play.

What’s in it for you?

• Family Care Leave - We offer enhanced paid leave options for those important times.
• Insurances – All colleagues are covered by our life and disability insurance which provides protection and peace of mind.
• Wellbeing - We want our people to feel well and thrive. We offer resources and benefits to nurture physical and mental wellbeing along with opportunities to build community and inspire creativity.
• Colleague Discount – We know you'll love to build, so from day 1 you will qualify for our generous colleague discount.
• Bonus - We do our best work to succeed together. When goals are reached and if eligible, you'll be rewarded through our bonus scheme.

Your workplace: Your workplace will be the office, store or factory specified in this advert. Hybrid Working: Our hybrid work model, Best of Both offers you the option of flexibility to work from home up to two days per week. Your People Leader will discuss the principles of the model, including how this option applies to your role and team. Learn more about our benefits, culture and workplace experience here

Children are our role models. Their curiosity, creativity and imagination inspire everything we do. We strive to create a diverse, dynamic and inclusive culture of play at the LEGO Group, where everyone feels safe, valued and they belong.

The LEGO Group is highly committed to equal employment opportunity and equal pay and seeks to encourage applicants from all backgrounds (eg. sex, gender identity or expression, race/ethnicity, national origin, sexual orientation, disability, age and religion) to apply for roles in our team.

The LEGO Group is fully committed to Children’s Rights and Child Wellbeing across the globe.

Candidates offered positions with high engagement with children are required to take part in Child Safeguarding Background Screening, as a condition of the offer.

Thank you for sharing our global commitment to Children’s Rights.

Just imagine building your dream career. Then make it real. Join the LEGO® team today.

Our founder Ole Kirk Kristiansen made his first wooden toy in 1932. He persevered against the odds until his business was a success. Constantly innovating, never compromising. Building, rebuilding, and striving for the best. It is this resilience and permanent sense of renewal that drives us forward. We are never still. We will always be creating, inventing, andhaving fun. Build your career brick by brick and play your part in continuing our mission to “inspire and develop the builders of tomorrow”.