Staff Software Engineer, C++ Backend Development (Ad Cloud Bidding) - Tokyo Relocation required

Appier is hiring a Staff Software Engineer, C++ Backend Development (Ad Cloud Bidding) - Tokyo Relocation required (Japan). Level rates it ; you can apply on Appier.

Level's read on this job

On Level's scale, this software engineer role is Little AI ●○○○: aI is not part of the work.
Appier mentions visa sponsorship in this posting.
Level classifies it as a lead role.
Level lists 66 other open roles at Appier.

AI in this role

About Appier

Appier is an AI-native Agentic AI as a Service (AaaS) company that uses artificial intelligence (AI) to power business decision-making. Founded in 2012 with a vision of democratizing AI, Appier’s mission is turning AI into ROI by making software intelligent. Appier now has 17 offices across APAC, Europe and U.S., and is listed on the Tokyo Stock Exchange (Ticker number: 4180). Visit www.appier.com for more information.

About the role

Software engineers (Ad Cloud Bidding) at Appier Tokyo office build a wide range of platforms and services that interconnect data and AI with our customers and users. As a Staff Software Engineer, you will play a critical role in designing and building scalable and performant backend architecture, owning and driving the technical roadmap for sizable projects or services. You will also take responsibility for service operations – ensuring reliability, availability, and efficient deployment of large-scale distributed systems.

Responsibilities

Engage in the design of large-scale backend systems and distributed services
Contribute to technical roadmap and planning
Collaborate with cross-functional teams to deliver robust and high-performance systems
Troubleshoot production issues and contribute to root cause analysis
Ensure high reliability through best practices in service operation, monitoring, and deployment
Participate in on-call rotations and lead incident response when required

About You

[Minimum qualifications]

8+ years of experience in software development
Proficient in modern C++ programming (C++11 and later)
Familiar with Unix/Linux environments
Solid understanding of system programming
Experience in developing low-latency (millisecond-scale) and high-throughput (>1K QPS per machine) systems
Experience in service optimization and performance tuning
Strong sense of ownership and good problem-solving skills

[Preferred qualifications]

Experience in modern build systems
Experience in operation automation tools
Experience with monitoring, logging, and alerting frameworks

[Language]

Fluent in English or Chinese.

Open to overseas candidates/Visa Support
This position is based in Tokyo, Japan. For international candidates, Appier's Japan office provides visa sponsorship to ensure a smooth transition to Japan.

#LI-SW1 #LI-Hybrid

How we rate this

Staff Software Engineer, C++ Backend Development (Ad Cloud Bidding) - Tokyo Relocation required at Appier rates 31 out of 100 for how much of the daily work is AI. That makes it Little AI (AI Level 1 of 4). The level is about AI in the job, not seniority.

Classification

Little AI. AI is not part of the work.

●●●● Builds AI80 to 100
●●●○ Works on AI60 to 79
●●○○ Uses AI40 to 59
●○○○ Little AI0 to 39

Levels come from how often the tools, models and workflows of the role are named in the posting itself. Read the description and count the AI tools, models and workflows it names.

Key facts

Staff Software Engineer, C++ Backend Development (Ad Cloud Bidding) - Tokyo Relocation required is an open job at Appier.
Level rates this role AI Level 1 of 4: Little AI.
The role is based in Tokyo, Japan.
The job was posted on November 7, 2025.
Seniority: lead.
Applications are handled by Appier. Apply on Appier