Product Security Engineer - Lead Engineer

Job Overview

1. Background

Datachain is simultaneously taking on the challenge of launching multiple businesses with the potential to reach unicorn or even decacorn scale. To support these initiatives, we are proactively working to build and operate a healthy, scalable engineering organization.

Building an engineering organization capable of supporting these new businesses within a short period of time is an extremely challenging mission.

To achieve this, we aim to expand our team, create an environment where each individual can perform at their best, and communicate what makes our organization successful. By doing so, we seek to establish a repeatable model for building strong engineering teams and create a sustainable cycle that attracts even more talented people.

At Datachain, technical excellence directly translates into business strength, making highly skilled engineers essential to our success. While this is a highly demanding mission, the role offers a rare opportunity to build a valuable career while helping create a world-class engineering organization.

2. Key Responsibilities

As the Lead Product Security Engineer, you will play a central role in building new systems required to support major new business initiatives and establishing the ideal security posture for those systems.

You will be responsible for defining the security strategy and direction necessary to achieve a high level of security, working closely with both engineering team members and stakeholders across the organization. In other words, this is a leadership role responsible for driving product security across the company.

From an implementation perspective, the role requires not only knowledge of standard web application infrastructure, but also an understanding of financial systems and blockchain-specific security considerations. You will be expected to establish and maintain a robust security architecture capable of meeting the high security requirements of these domains.

Scope of Changes to Responsibilities:

Duties may be changed in accordance with the company’s business needs.

3. Background and Our Challenge

In next-generation financial systems, backend and blockchain technologies are critical components of the product. They play an essential role in ensuring scalability, maintainability, security, and effective integration with other technical domains.

These areas require engineers to continuously deepen their expertise while supporting stable, sustainable development over the long term. In this role, you will be expected to take a medium- to long-term perspective, contribute to technology selection and improvements to development processes, and help strengthen our in-house engineering capabilities.

Since its founding in 2018, Datachain has continued to invest in R&D as a Japan-born global deep-tech company, with the goal of creating infrastructure that becomes the de facto industry standard.

As we prepare for a future in which real-world assets (RWAs) such as equities, bonds, and real estate are increasingly represented as digital assets, we are accelerating the development of next-generation financial infrastructure.

Datachain has been a truly technology-driven company since its founding in 2018. Our mission has been to create globally competitive, deep-tech infrastructure originating from Japan and establish it as the de facto standard.

The technological expertise we have accumulated over the years has created significant opportunities for us today. However, because these markets have the potential for substantial global impact, we also expect competition to intensify.

We intend to seize this unique opportunity and build products that can change the world. To achieve this, we are building new engineering teams and actively recruiting highly skilled engineers who can become core members of the organization.

Reference Information and Related Links

Technologies currently in use

The technology stack may vary by project.

Blockchain

• Languages: Go, Rust, Solidity, Kotlin
• Networks: Ethereum, BNB Chain, Cosmos, etc.

Server-Side / Backend Development

• Language: Go
• Database: PostgreSQL (Azure Cosmos DB)

Frontend Development

• TypeScript
• Next.js
• wagmi
• Chakra UI

Infrastructure / SRE

• Cloud: Azure, Kubernetes
• CI/CD: GitHub Actions, Argo CD, Argo Workflows
• Observability: OpenTelemetry, Grafana

Required Qualifications

• Experience with cloud application security testing and vulnerability assessments
• Experience working for a security vendor, or equivalent security expertise
• Practical experience related to the Act on the Protection of Personal Information (APPI), data protection, or data governance and controls
• Strong interest in blockchain technology

Preferred Qualifications

• Experience in security roles within the financial or FinTech industry
• Knowledge of or experience with system audits and information security audits
• Experience designing, operating, or leading incident response processes
• Experience establishing information security or related organizational functions
• Experience sharing technical knowledge or publishing technical content in the engineering domain
• Experience developing blockchain-related systems or applications

Ideal Candidate Profile

• Able to assess the current state of systems, define the desired future state, and lead teams in building high-quality systems
• Able to balance business, organizational, and technical considerations and clearly articulate what should be done from a technical perspective
• Able to collaborate with engineers and Tech Leads across the company to shape a strong engineering culture
• Proactively works to deepen technical expertise and takes the initiative in building the development environments and engineering organization necessary to create high-quality systems