Software Engineer, iOS (Platform Product) - Merpay

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iOSSwiftGo

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Software Engineer, iOS

Employment Status: Full-time
Work Hours: Full Flextime (no core time)
Office: Roppongi

About

Circulate all forms of value to unleash the potential in all people

By circulating all forms of value―not just physical things and money―we aim to create opportunities for anyone to realize their dreams and contribute to society. Leveraging technology, our mission is to connect people around the world and allow everyone to unleash their potential.

Our Culture

Team Mission & Engineering Principles

Engineering Principles
Our engineering principles are a shared understanding of foundational beliefs and behaviors:

Passion For The Product
Grow Together
Solve Through Mechanisms
Collaborate Openly

Learn more about our Engineering Culture

Role Overview

We are seeking a professional iOS engineer to drive development of new payment and financial services, aligned with our mission of “building trust for a seamless society.”

Take ownership from planning through development for new services
Leverage deep iOS (Swift) expertise, collaborating with PMs, designers, backend and QA/Test engineers
Contribute to both core product features (e.g., identity verification, bank integrations, server-driven UI) and growth initiatives
Work on quality improvements, testing, automation, release stabilization, and developer experience
Opportunity to go beyond iOS and contribute to Android, Web, backend, or other roles (product management, QA)
Actively promote an AI-native approach while upholding correctness, security, privacy, and user trust
Work in a diverse, global environment where English communication is valued

External contributions are encouraged and valued:

Speaking at conferences (e.g., try! Swift, iOSDC)
Writing articles on the Engineering Blog

Work Responsibilities

Design, develop, and improve new features related to core platform functions (e.g., identity verification, bank integrations, server-driven UI)
Collaborate in team-based development with product, design, backend, and QA
Improve code quality and development environment
Code reviews
Create prototypes/POCs introducing new iOS-related technologies

Tech Stack:

SwiftUI
Combine, Concurrency
Protocol Buffers
Bazel
GitHub Actions
Claude Code
Cursor
Internal AI agents

Experience with all technologies is not required upfront.

Unique Challenges

Deliver a leading smartphone payment app in Japan—high speed and high quality for millions of users
Tackle advanced development and security challenges in financial/payment and mobile
Balance iOS platform constraints and business requirements
Collaborate with teammates from diverse backgrounds
Go beyond feature development to evolve the developer experience and AI-native workflows

Qualifications

Required Experience & Skills

Alignment with the mission and values
Passion for financial services
Native iOS development with Swift
Knowledge of iOS libraries and frameworks
Team-based development with PMs, designers, backend, and QA
Willingness to go beyond iOS when needed
Interest in AI-native development, validating correctness/quality

Preferred Experience & Skills

Development/operation of native apps with large user bases
UI development expertise with SwiftUI
Fintech or KYC experience
Writing testable code, process/release automation experience
Experience with Bazel build system
Performance optimization
OSS contributions, tech blogging, conference speaking

Language Requirements
One of the following is preferred:

English: Independent (CEFR B2) / Japanese: Basic (CEFR A2)
Japanese: Independent (CEFR B2) / English: Basic (CEFR A2)

CEFR details

More Information

Recruiting Process

Application screening
Skill assessment (HackerRank/GitHub for engineering positions)
Interviews (number may vary)
Reference check (online, final round)
Offer (carefully considered based on final interview and reference)

Learn more about our recruiting process

Equal Opportunity

We are committed to a world where no one’s potential is limited by their background, and everyone can freely create value.
We eliminate discrimination based on age, gender, sexual orientation, race, religion, physical disability, and more.

Inclusion & Diversity Statement
Privacy Policy