Senior Software Engineer (C++/C)

the LEGO Group; Billund; Hybrid; DKK 900,000 - 1,200,000; Full time

Benefits offered by this job

Hybrid Working

Colleague Discount

Bonus scheme

Wellbeing resources

Job summary

LEGO Group in Billund, Denmark, is seeking a Senior Software Engineer to design and build high-performance core engines and platforms enabling exciting, tech‑enabled play experiences.

You will own key engine components, collaborate with Lead Engineers and cross‑functional teams, and help bring LEGO fans' interactive play to life while ensuring reliability and scalability.

The role offers a hybrid work model with opportunities to work across office, stores and factories within the LEGO ecosystem.

Qualifications

• Strong software engineering experience in developing complex systems, engines or platforms.
• Ability to analyse complex problems, trade-offs and communicate decisions clearly.
• Fluent in C/C++ with experience in building performance-focused software.
• Experience with DSLs and delivering projects within a team.
• Balance user experience with technical constraints and meets milestones.

Responsibilities

• Design, implement, maintain and optimise core engine components.
• Own complex technical challenges, contribute across the platform stack.
• Improve performance, resource utilisation and reliability in constrained systems.
• Contribute to architecture discussions and design trade-offs.
• Maintain high engineering standards with reviews, tests and CI.
• Collaborate with Engineering Leads and System Architects across domains.

Skills

C/C++ proficiency

Engine design

Performance optimisation

System architecture

Team collaboration

Education

Bachelor's degree in CS or related

Tools

GitHub

Jira

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:

• 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?

Here is what you can expect:

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.

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 seeksto 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.

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