Labor & HR Operations Specialist Blog --> Career Opportunities --> ← All open positions Corporate Labor & HR Operations Specialist Own payroll, social insurance, and labor administration end-to-end, and design the processes that scale with a fast-growing team. Tokyo Full-time Japanese (Fluent) & English (Business) 労務スペシャリスト Sakana AIは、日本発でグローバルにAIの基礎研究と応用開発を推進するスタートアップです。急速に拡大する組織を支えるため、労務機能を主体的に担う労務スペシャリスト（シニア）を募集しています。 従業員が安心して働ける基盤は、正確な給与計算、適切な社会保険・労務手続き、そして法令に沿った労務管理の上に成り立ちます。急成長のフェーズでは、既存の仕組みを回すだけでなく、制度やプロセスそのものを設計・改善していく力が求められます。多様なバックグラウンドを持つメンバーが働く環境で、当事者意識を持って労務の仕組みを築く役割です。 本職務はフルタイムで、東京オフィスへの出社を中心とします。流暢な日本語での会話および業務文書の理解を必須とし、外国籍メンバーとのやり取りや各種書類対応のため英語での基本的なコミュニケーション能力を求めます。 役割と責任 給与計算・支払、賞与計算、年末調整の運用・確認を行う 社会保険・労働保険の手続き（入退社、算定基礎、月額変更、給付申請等）を担当する 勤怠管理を運用し、労働時間・休暇・残業の状況を確認・是正する 入退社に伴う労務手続きと関連書類（雇用契約、就業関連書類等）を整備する 就業規則・各種規程の運用を支え、法改正に応じた見直しを提案する 裁量労働制・高度プロフェッショナル制度の適正な運用を行う 労務関連システムの導入・改善によりプロセスを効率化する 従業員からの労務・社会保険に関する問い合わせに対応する 人事・経理・外部専門家（社会保険労務士等）と連携する 応募資格およびスキル（Must） 事業会社または社労士事務所での労務実務経験3年以上 給与計算および社会保険・労働保険手続きの実務経験 36協定・裁量労働制・高度プロフェッショナル制度等に関する労使委員会の運営や事務手続きの実務経験 日本の労働関連法規に関する実務的な知識 流暢な日本語でのコミュニケーション能力 歓迎要件（
Nice to Have） グロースフェーズのスタートアップでの労務経験 労務関連システム（勤怠・給与・人事）の導入・運用改善の経験 社会保険労務士資格、またはその関連知識 就業規則・労務制度の設計・改定に関わった経験 英語での業務コミュニケーション能力（読み書き・会話） 求める人物像 細部まで正確さを重視し、責任感を持って業務を遂行できる方 非効率や潜在的なリスクを能動的に洗い出し、改善をリードできる方 スタートアップならではのスピード感と変化に柔軟に対応できる方 従業員や社外の専門家と的確かつ丁寧なコミュニケーションができる方 Labor & HR Operations Specialist Sakana AI is a Tokyo-based startup advancing both foundational AI research and applied development for a global audience. As our organization grows rapidly, we are hiring a senior Labor & HR Operations Specialist to take ownership of our labor operations function. A workplace where people can focus and thrive rests on accurate payroll, sound social insurance and labor administration, and compliant labor management. In a high-growth phase, this role is not only about running existing processes but also about designing and improving the systems and processes themselves. You will help build the foundation that supports a team of people from many different backgrounds. This is a full-time role based primarily in our Tokyo office. Fluent Japanese (spoken and written) is required. Basic English communication is also expected, as you will work with international team members and handle related documentation. Roles and
Responsibilities Run and verify payroll,
bonus calculations, and year-end tax adjustment (nenmatsu chosei). Handle social and labor insurance procedures (onboarding/offboarding, standard remuneration, monthly revisions, benefit claims, etc.). Operate attendance management and review working hours, leave, and overtime. Maintain labor-related procedures and documents for joiners and leavers (employment contracts, work-related documents). Support the application of work rules and internal policies, and propose updates in line with legal changes. Ensure the discretionary work system and the highly professional work system are administered correctly. Improve and streamline processes by introducing and refining labor-related systems. Respond to employee questions on labor and social insurance matters. Collaborate with HR, Finance, and external specialists (e.g., labor and social security attorneys).
Qualifications and Skills (Required) 3+ years of hands-on labor operations experience at a company or a labor & social security attorney’s office. Practical experience with payroll and social/labor insurance procedures. Hands-on experience running labor–management committees and the related administration (Article 36 agreements, the discretionary work system, the highly professional work system). Working knowledge of Japanese labor law and related regulations. Fluent Japanese communication skills.
Qualifications and Skills (Preferred) Labor operations experience at a growth-stage startup. Experience introducing or improving labor-related systems (attendance, payroll, HR). Certification as a labor and social security attorney (Sharoushi), or related knowledge. Experience designing or revising work rules and labor policies. English communication skills for work (reading, writing, and conversation).
Sakana AI develops research-oriented artificial intelligence systems that draw inspiration from natural processes like evolution and collective intelligence. The company designs methods such as evolutionary model merging, multi-agent orchestration, and autonomous research agents to create AI models capable of adaptation and collaboration across tasks. Its work includes systems that automate elements of scientific research and frameworks that combine multiple models to generate new, task-specialized AI learners. Sakana AI engages in partnerships with enterprise and research organizations to apply its technology in domain-specific workflows and innovation projects. The company contributes tools and models to the broader AI community and explores applications that extend beyond conventional AI pipelines.
