--- title: 'Senior Software Engineer, Backend Development(Ad Cloud Serving Services) - Tokyo,Japan at Appier' canonical: 'https://feeny.ai/job/senior-software-engineer-backend-development-ad-cloud-serving-services-tokyo-j28exjv51q8a' type: 'job' last_seen: '2026-09-21' --- # Senior Software Engineer, Backend Development(Ad Cloud Serving Services) - Tokyo,Japan at Appier - **Company:** Appier - **Location:** Tokyo, Japan - **Posted:** 2026-09-15 - **Last confirmed live:** 2026-09-21 - **Apply:** https://job-boards.greenhouse.io/appier/jobs/8203710 ## Job description ## About Appier Appier (TSE: 4180) is an AI-native Agentic AI as a Service (AaaS) company that empowers businesses to create value through cutting-edge AdTech and MarTech solutions. Founded in 2012 with the vision of “Making AI Easy by Making Software Intelligent,” Appier helps businesses turn AI into ROI through its Ad Cloud, Personalization Cloud, and Data Cloud—each powered by Agentic AI that enables autonomous, adaptive, and real-time decision-making. Today, Appier operates 17 offices across APAC, the US, and EMEA, and is listed on the Tokyo Stock Exchange. Learn more at www.appier.com. ## About Ad Cloud  Serving Services Team At Appier's Ad Cloud Team Serving Services Team, we build and maintain the critical systems that power the core of Appier's advertising technology. These systems handle massive, high-concurrency, real-time requests, and ensure the stability, low latency, and high performance of our ad delivery. Our SRE professionals are crucial in guaranteeing these services remain reliable under extreme loads, continuously enhancing product availability and performance through innovation and automation. ## Responsibilities - Lead the design and development of scalable, high-performance, and reliable backend services for real-time ad recommendation, data serving, and core ad tech infrastructure. - Drive technical roadmap and ownership for sizable projects, ensuring the delivery of robust and efficient solutions within the Ad Cloud ecosystem. - Optimize critical system components for latency, throughput, and resource utilization, including database interactions (e.g., MongoDB sharding, ClickHouse optimizations) and network architecture. - Enhance system observability, incident management, and operational excellence by implementing comprehensive monitoring, alerting (e.g., Grafana, Prometheus), and refining production SOPs. - Collaborate closely with product managers and scientists to translate business requirements into technical designs and ensure seamless integration. - Champion code quality through rigorous code reviews and adherence to best practices in system design and implementation. - Mentor and guide junior engineers, fostering their growth in backend development best practices, distributed systems, and agile methodologies. - Actively participate in on-call rotation within the Backend team to maintain product reliability and scalability for critical serving services. - Contribute to a culture of continuous improvement, initiating team-level technical discussions, process enhancements, and knowledge sharing. ## About You [Minimum Qualifications] - 3-5+ years of hands-on experience in backend software development, particularly with high-performance, high-concurrency systems. - Proficient in one or more of the following languages: Go, Python. - Strong experience in system design and architecture for scalable and distributed systems, especially within a Linux environment. - Good understanding of Network API Design (e.g., RESTful APIs, gRPC) and experience with message queues (e.g., Kafka, Pub/Sub) for data pipelines. - Solid knowledge of SQL/NoSQL databases (e.g., MySQL, MongoDB, Redis, ClickHouse, PostgreSQL) and experience with database optimization and scaling strategies. - Familiarity with DevOps practices, including CI/CD pipelines, Docker, Kubernetes, and cloud platforms (AWS, GCP, or Azure). - Experience with observability tools (e.g., Prometheus, Grafana) and robust monitoring and alerting implementation. - Proactive, excellent problem-solving skills, and strong communication in a cross-functional team setting. [Preferred Qualifications] - BS/MS degree in Computer Science or a related field. - Demonstrated ability to refactor complex systems, improve performance metrics (e.g., latency, error rate, CPU usage), and optimize resource utilization. - Familiarity with A/B testing frameworks and supporting customizable configurations for model iteration. - Hands-on experience with deploying and serving machine learning models in production environments. - Exposure to ad-tech or recommendation systems is a plus. 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-EZ1 #LI-EP1 ## About Appier ## Company Overview - **One-liner**: Appier is an AI-native Agentic AI as a Service (AaaS) company that empowers businesses to turn AI into ROI through cutting-edge AdTech and MarTech solutions. - **Entity Type**: Public (Tokyo Stock Exchange, ticker 4180) - **Headquarters**: Taipei, Taiwan (with 17 offices globally including San Francisco) - **Founded**: 2012 - **Founders**: Chih-Han Yu (CEO), Wan-Ling Lee (COO), Ming-Yu Chen (CSO), Chia-Yung Su (CTO), Che-Hsu Chang (CIO) ## Core Business - **Primary industry**: AI-powered advertising technology (AdTech) and marketing technology (MarTech) - **Target customers**: B2B – primarily enterprise and SMB businesses seeking AI-driven marketing automation, customer data platforms, and programmatic advertising - **Mission**: "Making AI Easy" – helping businesses turn Agentic AI into ROI ## Products & Services - **Ad Cloud**: Performance-driven advertising platform that automates creative testing, audience targeting, and campaign optimization to maximize ROAS. - **Personalization Cloud**: Cross-channel customer engagement platform that personalizes every touchpoint using real-time AI adaptation (includes AIQUA). - **Data Cloud (AIRIS)**: AI-powered Customer Data Platform (CDP) that centralizes, segments, and activates data for unified audience intelligence and real-time decision-making. - **Other tools**: Aictivate (mobile gamer re-engagement), CrossX (advertising solution), BotBonnie (conversational marketing platform), AdCreative.ai (generative AI creative generation). ## Market Standing - **Valuation/Cap**: Market capitalization not publicly available in the search results; company is listed on the Tokyo Stock Exchange (Prime section since 2025). - **Key Metrics**: Total funding raised (estimated from disclosed rounds): ~$142M+ (Series A $6M, Series B1 $23M, Series C $33M, Series D $80M). Annual revenue not disclosed. - **Notable Investors/Partners**: Sequoia Capital, SoftBank Group, LINE Corporation, NAVER, EDBI, AMTD Group, TGVest Capital, HOPU-ARM Innovation Fund, Temasek’s Pavilion Capital, JAFCO Asia/Investment, UMC Capital, TransLink Capital, MediaTek Ventures, Fontaine Capital, UOB Venture Management. - **Growth Signals**: Expanded from 4-person start-up to 17 offices globally, serves 1,800+ customers, acquired Woopra (2022), BotBonnie, QGraph, Emin, AdCreative.ai; ranked top ROI-driving ad partner by Singular for two consecutive years; moved to TSE Prime listing in 2025. ## Competitive Advantages - **Deep AI R&D**: 70% of R&D staff hold PhDs or Master’s degrees in AI/Big Data, with 400+ academic publications. - **Agentic AI Platform**: Autonomous, adaptive agents for advertising, personalization, and data – built on proprietary machine learning, deep learning, and generative AI. - **Full-funnel coverage**: Combines AdTech and MarTech in a unified AI-native stack. - **Global footprint with localised expertise**: Strong presence across APAC, Europe, and US enables cross-border scalability. ## Strategic Focus - **Agentic AI expansion** – further develop autonomous AI agents across advertising, personalization, and data clouds. - **Global growth** – strengthen presence in US and European markets following recent acquisitions (AdCreative.ai, Woopra). - **Generative AI innovation** – incorporate generative AI into creative and campaign workflows. - **Sustainability & governance** – Received “AA” MSCI ESG rating, integrating ESG into operations. ## Why Work Here - **Culture**: “H-appier” framework – Hungry (ambitious, fearless), Humble (open-minded, adaptive), Happier (direct communication, diversity & inclusion, growth). Strong emphasis on execution excellence and customer centricity. - **Remote/Hybrid/Office**: 17 offices globally; specific policy not detailed but positions are likely hybrid/office-based depending on role (many engineering jobs listed in San Francisco, Taipei, etc.). - **Team**: 642 total employees (Built In estimate); engineering roles heavily weighted in AI/ML. - **Perks & environment**: “Start a career, not a job” – career growth tools, collaborative environment, celebration of wins. ## Sources 1. [appier.com](https://www.appier.com/en/) 2. [appier.com/about](https://www.appier.com/en/about) 3. [appier.com/career](https://www.appier.com/en/about/career/) 4. [greenhouse.io](http://job-boards.greenhouse.io/appier) 5. [builtin.com](https://builtin.com/company/appier) ## Other roles at Appier - [Technical Program Manager — AdCloud AI Bidding](https://feeny.ai/job/technical-program-manager-adcloud-ai-bidding-appier-taipei-8cn9m349qfsf) — Taipei, Taiwan - [Senior Software Engineer, Data Backend (Ad Cloud)](https://feeny.ai/job/senior-software-engineer-data-backend-ad-cloud-appier-taipei-tn2r195tzf5a) — Taipei, Taiwan - [Senior Executive Assistant to Global SVP, Head of Sales](https://feeny.ai/job/senior-executive-assistant-to-global-svp-head-of-sales-appier-taipei-sgf6yxxk2zww) — Taipei, Taiwan - [[Part Time] AI Creative QC Reviewer, Korea](https://feeny.ai/job/part-time-ai-creative-qc-reviewer-korea-appier-seoul-hg4ydvndjgak) — Seoul, South Korea - [Data Scientist, Analytics - Tokyo,Japan.](https://feeny.ai/job/data-scientist-analytics-tokyo-japan-appier-tokyo-55tbhp1hk5yz) — Tokyo, Japan - [Product Manager / Technical PM — Data Engineering](https://feeny.ai/job/product-manager-technical-pm-data-engineering-appier-taipei-m9wy0rzbmcgb) — Taipei, Taiwan - [Assistant Manager of Business Enablement](https://feeny.ai/job/assistant-manager-of-business-enablement-appier-taipei-epwv22be5msh) — Taipei, Taiwan - [Software Engineer, Ads Solutions](https://feeny.ai/job/software-engineer-ads-solutions-appier-taipei-33k53pkdee0x) — Taipei, Taiwan - [Research Scientist (Generative & Agentic AI) - Tokyo,Japan.](https://feeny.ai/job/research-scientist-generative-agentic-ai-tokyo-japan-appier-tokyo-0fp9gmx6k9c5) — Tokyo, Japan - [Digital Advertising Data Analyst](https://feeny.ai/job/digital-advertising-data-analyst-appier-taipei-hk4zaeyad3j2) — Taipei, Taiwan