About Us
At Sales Marker, our mission is to create a world where all people and companies can challenge themselves beyond existing boundaries. We’re one of the fastest growing start-ups in Japan and we’re growing at a speed that is twice as fast as Unicorn startups. By using our product, sales teams can improve their work efficiency by 3 times. We have achieved over 900% YoY business growth rate in 2.5 years since our flagship product 「Sales Marker」 was released and we’re currently actively working on a wide range of new product portfolios.
The Team
The Common Foundation team helps engineering teams move faster by providing scalable, reliable, and reusable systems that serve as the platform for product development. The Platform Foundation side focuses on reliability, performance, security, and developer productivity across our cloud infrastructure and Kubernetes platform. We build paved roads, automate operations, and ensure that application teams can ship safely at speed.
We're looking for a Site Reliability Engineer who can own the health and evolution of our platform. You’ll design and operate our AWS and Kubernetes environments, lead reliability initiatives, and partner with product engineers to embed best practices in availability, observability, and performance. You’ll turn complex infrastructure into simple, well-documented, self-service building blocks.
Responsibilities
- Operate and improve our Kubernetes platform (EKS), including cluster lifecycle, upgrades, scaling, networking, and multi-tenant isolation.
- Design, provision, and manage AWS infrastructure (VPC, RDS/Aurora, OpenSearch, S3, SQS, Lambda, API Gateway, Batch, Glue) with a strong focus on security, reliability, and developer experience.
- Build infrastructure as code using Terraform and AWS CDK. Establish standards for modules, environments, and change management via GitOps.
- Drive observability end to end: metrics, logs, traces, SLOs, error budgets, and actionable dashboards and alerts in Datadog.
- Partner with backend engineers to improve service reliability, performance, and cost efficiency. Champion best practices in testing, rollout strategies, and production readiness.
- Automate operations and repetitive work with tooling and pipelines. Reduce MTTR with improved runbooks, diagnostics, and incident tooling.
- Lead incident response and post-incident reviews. Raise the operational bar through blameless retros, remediation plans, and reliability roadmaps.
- Strengthen platform security through identity and access control, secrets management, network policies, patching, and vulnerability management.
- Support data workloads and pipelines with robust, scalable infrastructure and monitoring.
- Contribute to platform documentation, paved paths, and self-service developer workflows to accelerate delivery.
Requirements
- 3+ years in SRE, Platform, or Infrastructure Engineering with production ownership of cloud-native systems.
- Strong experience running Kubernetes in production, including upgrades, scaling, and workload reliability.
- Deep hands-on expertise with AWS services (networking, compute, storage, databases, messaging) and secure-by-default architectures.
- Proficiency with IaC (Terraform and/or AWS CDK), modularization, and environment management.
- Solid observability fundamentals: metrics, logging, tracing, SLOs/error budgets, actionable alerting.
- Proven track record improving reliability, performance, and developer experience in partnership with application teams.
- Experience running incident response and driving post-incident improvements.
Nice to Have
- Experience with identity and access management patterns, Cognito, JWT, and service-to-service auth.
- Background in multi-tenant architectures, capacity planning, and cost optimization.
- History of handling major incidents at scale and building tooling to reduce MTTR/MTTD.
- Contributions to internal developer platforms, golden paths, or shared libraries.
- Fluency in English or Japanese.
Why Us?
- One of the fastest growing Saas startup in Japan with strong financial growth
- Innovative new product development and opportunity to build things from scratch.
- Plenty of leadership and career development opportunities.
- Remote-friendly & full flexible work schedules.
- Global team and English speaking environment.
- Great benefits & perks packages such as Resort Worx, Purchasing Books, Free Weekly Lunch, Offsites, etc.
Working Style
● Hybrid Work
We follow a hybrid work style, combining both office and remote work. Recommended in-office days vary by role. Even when working remotely, we maintain smooth collaboration and communication through tools like Zoom, Google Meet, and Gather.
● Flex Work
You can customize your working hours to suit your day. For business and client-facing teams, schedules are often arranged around client meetings.
● Global Environment
With team members from over 20 countries, we bring together diverse perspectives and ideas, driving projects forward across languages and cultures in an environment where English and Japanese blend naturally into daily communication.
Read More
■Career Page: https://sales-marker.jp/corporate/en/
■Culture Book: https://speakerdeck.com/salesmarker/sales-marker-culturebook-en
■YouTube: https://www.youtube.com/watch?v=Ob8Ds06zwo0
| 職種 / 募集ポジション | Site Reliability Engineer – Platform Foundation |
|---|---|
| 雇用形態 | 正社員 |
| 契約期間 | 【Contract Type】 Permanent |
| 給与 |
|
| 勤務地 | 【Office Location】 5 minutes walk from the east exit of Ebisu Station on the JR Yamanote Line 7 minutes walk from Exit 1 of Ebisu Station on the Tokyo Metro Hibiya Line |
| 勤務時間 | 【Working Hours】 Full Flexible with no core hours |
| 休日 | 【Holidays & Vacations】 - Holidays: Saturdays, Sundays, and national holidays; - Paid Time-off: 10 days of annual paid leave will be granted after six months of employment. |
| 福利厚生 | 【Benefits and Perks】 ■Medical checkup ■Travel allowance ■Others High-performance Macbook Book purchase allowance Wantedly Perk Uber Eats Coupon Grant Resort Works |
| 加入保険 | 【Social Insurances】 All types of insurances are covered (Health insurance, employee pension, workers' accident compensation insurance, unemployment insurance) |
| 受動喫煙対策 | 【Second-hand smoking policy】 No smoking inside the building |
| Probation Period | 6 months (same conditions during probationary period) |
| 会社名 | 株式会社Sales Marker |
|---|---|
| 設立年月 | 2021年7月29日 |
| 本社所在地 | 〒150‐6032 東京都渋谷区恵比寿4-20-3 恵比寿ガーデンプレイスタワー32F |
| 資本金 | 1億円 |
| 従業員数 | 336名（取締役+業務委託を含む） |