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Lead Engineer - AI-Native Email App

bjakcareerTokyo, JapanEngineering
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Salary
Not listed
Job type
Full-time
Work mode
Remote
Experience
Lead
Posted
1 Oct 2026
Status
Open · checked 7d ago

About this role

Lead Engineer - AI-Native Email App is an open position based in Tokyo, Japan, operating under a hybrid work model that requires attendance at the local office at least three days per week. This position suits an experienced technical leader who enjoys maintaining hands-on coding responsibilities while driving major product initiatives from conception to production.

Role Overview

BJAK is hiring a Lead Engineer to take technical ownership of complex products and systems while raising the overall engineering standards of the team. This position requires a balance between architectural decision-making and direct implementation, involving backend, frontend, database, and infrastructure tasks. English serves as the primary working language, and candidates must reside in or be capable of working from the advertised location.

Key Responsibilities

Guide the technical design and execution for major products, features, and initiatives.
Build scalable and reliable systems covering backend, frontend, APIs, databases, and infrastructure.
Participate directly in coding, prototyping, code reviews, debugging, and production problem-solving.
Make architectural trade-offs to balance speed, scalability, reliability, and maintainability.
Translate ambiguous technical and product problems into clear execution plans.
Evaluate code quality, security, and observability standards across the team.
Review technical designs and code from peers to deliver actionable feedback.
Mentor engineering staff to strengthen technical capabilities.
Identify architectural bottlenecks and technical risks early.
Collaborate closely with design, product, engineering, and AI teams to deliver solutions rapidly.
Refine development practices, automation, and tooling to boost team velocity.
Monitor production systems, investigate incidents, and manage post-release reliability.

Requirements

Background in software engineering with a history of building and shipping production systems.
Technical depth in areas such as backend, frontend, distributed systems, cloud infrastructure, databases, or APIs.
Expertise in system design and architecture for complex or high-scale environments.
Proficiency in coding with a willingness to stay hands-on.
Experience leading major technical projects and providing guidance to other engineers.
Capability to review code, debug intricate issues, and manage production systems.
Skill in communicating complex technical choices clearly.
Product awareness that links technical decisions to business outcomes.
Ability to operate quickly amidst ambiguity and assume end-to-end ownership.
Judgment regarding when to prioritize speed versus deeper technical investment.

Skills and Tools

Backend systems
Frontend systems
Distributed systems
APIs
Databases
Cloud infrastructure
Software architecture and system design
Code review and debugging tooling

About the Company

BJAK operates as a financial platform originally founded in 2019 to provide accessible insurance solutions in Southeast Asia. The organization has expanded its scope to encompass spending, saving, investing, currency exchange, and travel. Global teams include over twenty nationalities working from offices and remote locations.

How to Apply

Interested candidates should apply on the official company careers page.

Skills and tech stack

BackendFrontendAPIsDatabasesCloud InfrastructureDistributed Systems

Questions candidates ask

What is the location and work arrangement for this role?

The job is based in Tokyo, Japan, and follows a hybrid schedule requiring presence in the local office at least three days per week.

Is this a purely managerial position?

No, this is a hands-on technical leadership role where the candidate is expected to write and review code, prototype, and debug production systems.

What language is used for communication?

English is the main working language across global teams, and strong English communication skills are required.

What does the interview process look like?

The interview process consists of an online assessment or practical task, a technical interview, and a CEO or final round.

What is the timeline for the hiring process?

For strong candidates, the organization aims to complete the interview process and deliver an offer within one week from the start of the process.

Ready to apply?

The application is on the official bjakcareer careers page.

Apply on company site