Senior Software Engineer, Platform Services

Nex is on a mission to help families rediscover the joy of movement. Created by parents for parents, Nex combines technology and play to deliver fun, social, and interactive experiences powered by natural body motion, encouraging kids and adults to move more, play more, and have fun together. Nex Playground, the company’s award-winning active play system, is purpose-built to get families moving year-round, with safety and privacy as core considerations in its intentional design. It is certified kidSAFE+ COPPA compliant and built to support healthy, active play for all ages and abilities.

Nex Playground features a growing library of 50+ experiences, including motion and dance games, fitness and educational experiences, and Nex Originals. Content includes collaborations with partners like Hasbro, Sesame Workshop, and NBCUniversal. Nex has been recognized by Fast Company’s Most Innovative Companies, TIME’s Best Inventions, and Parents’ Best Entertainment System for Families, and has earned Red Dot, IDEA, and Core77 international design awards. We encourage you to explore Have Fun and Is Motion Gaming Back?, as they offer a deeper look into our culture, values, and explain how our approach to motion gaming differs from previous generations.

Location: Hong Kong
Type: Full Time

The Role

As a Senior Software Engineer at Nex, you will architect and build the scalable backbone of our global platform powering e‑commerce, subscriptions, user management, device pairing, content delivery, recommendations, support systems, analytics, and system updates. Your work will serve millions of connected devices and the operating systems behind them, shaping daily user experiences worldwide. You will partner with business, product, and operations, as well as a mission‑aligned external engineering team, to deliver backend infrastructure that is simple, robust, observable, and reliable at scale.

The Mindset

You care deeply about elegant, scalable systems. You thrive in fast‑paced, product‑driven environments and see great backend engineering as the intersection of craft, simplification, and impact. You enjoy solving problems across performance, security, reliability, and maintainability. You are customer‑obsessed and biased for action. You move quickly while staying precise, careful, and risk‑aware.

What You’ll Do

• Design, build, and operate scalable backend services for e‑commerce, subscriptions, accounts, device activation, content delivery, recommendations, support, analytics, and system updates.


• Build services that are reliable, fault‑tolerant, and highly observable, with strong monitoring, logging, and alerting.


• Develop robust APIs and backend logic using .NET (C#) and Node.js, with occasional Python.


• Implement and optimize authentication flows, including OAuth and device authentication.


• Use Docker and Kubernetes for deployment, scaling, and service management.


• Architect fault‑tolerant systems using queues, service‑oriented patterns, and message‑driven workflows.


• Guide and collaborate with a mission‑aligned external engineering team.


• Work closely with business, product, and operations to deliver customer‑obsessed solutions.

Must Have

• 5+ years building backend services for high‑traffic products.


• Strong expertise in .NET (C#), Node.js, and Python.


• Proven experience running highly observable services in production using Docker and Kubernetes.


• Experience with distributed systems, big data workflows, and database optimization across NoSQL and PostgreSQL.


• Deep understanding of ACID, idempotency, message delivery guarantees, and high‑performance concurrent access.


• Passion for deep technical challenges and raising the engineering bar.


• Ability to lead troubleshooting and postmortems during production incidents.


• Ability to work effectively with global teams across time zones.


• Proficiency in English communication.

Nice To Have

• Experience with authentication patterns including OAuth and device flows.


• Experience building fault‑tolerant systems using queues and service‑based or microservices architectures.


• Expertise with real‑time data streams and messaging tools such as Apache Kafka, SQS, or Pub/Sub.


• Familiarity with Firebase and Supabase.


• Knowledge of privacy, compliance, and information security best practices.


• Experience in startups, high‑growth environments, or consumer product companies.

We Offer

• Competitive compensation package.


• Flexible working hours and vacation policy.


• Product-driven culture that treasures talents and individual growth.


• Front-row seat and hands-on experience with cutting edge technologies in the evolving gaming field

Nex is located in San Jose, California, USA and Hong Kong. Learn more about us at nex.inc/who-we-are.

We encourage applications even if you don’t meet more than 50% of the requirements — we believe that experience comes in many forms!