Senior Engineer - Payment & Wallet

Coinhako; Singapore; On-site; SGD 80,000 - 120,000; Full time

Benefits offered by this job

Friendly startup culture

Generous annual leaves

Medical coverage

Self-care benefits and fitness workshops

Job summary

Coinhako is looking for a Senior Engineer to join their Payments & Wallet team, responsible for designing and maintaining high-performance services that power their infrastructure.

You will collaborate with cross-functional teams to ensure seamless integration and enhance platform reliability. This role requires a Bachelor’s/Master’s in Computer Science and over 5 years of experience with scalable systems.

Coinhako offers a fun startup culture, generous leave policies, and medical coverage.

Qualifications

• 5+ years of experience building scalable distributed systems.
• Strong background in Ruby; familiarity with Go is beneficial.
• Knowledge of best practices in API development.

Responsibilities

• Architect and build scalable backend services.
• Design and build high-volume APIs for frontends and external traders.
• Manage custody solutions for digital assets, ensuring security and compliance.

Skills

Ruby

Go

API Development

Cryptography

Blockchain Compliance

Education

Bachelor’s or Master’s degree in Computer Science, Engineering, or related field

Tools

Rails 7

AWS

Docker

Job description

We are looking for a Senior Engineer to join our Payments & Wallet team (also known as PAW) – the core group handling asset management, compliance, and On-chain Services & Integrations (Superwallet) at Coinhako.

In this role, you will be responsible for designing, developing, and maintaining high-performance services that power our payments and wallet infrastructure. You’ll collaborate with cross‑functional teams to ensure seamless integration across systems, optimize transaction workflows, and enhance platform reliability and scalability.

What you'll be doing

• Architect and build scalable backend services. Our tech stack is Rails 7, Go, Sidekiq, REST, AWS, Docker;
• Design and build high-volume APIs used by our frontends and external traders;
• Take initiative to ensure the long‑term quality of the code and drive decisions related to the architecture of production systems;
• Manage and maintain custody solutions for digital assets. Ensure the highest level of security and compliance in handling and storing digital assets, including cryptocurrencies, tokens, and digital records;
• Collaborate with other engineers, product managers and designers during various product development stages;
• Improve engineering standards, tooling, and processes.

What we're looking for

• Bachelor’s or Master’s degree in Computer Science, Engineering, or related field;
• Understand good practices of building and working with APIs;
• Have 5+ years of building scalable distributed systems with a strong background in Ruby; Go is a plus;
• Comfortable with ambiguity and scoping solutions with your teammates;
• You’re organized, proactive and can be your own manager;
• Knowledge of cryptography and security principles in blockchain as well as compliance and regulatory frameworks for cryptocurrency.

What’s in it for you

• Friendly and fun startup work culture
• Convenient work location located in the heart of CBD area
• Generous annual leaves on top of national holidays
• Medical coverage including GP, Specialist, TCM, and more
• Self‑care benefits and exciting fitness workshops/webinars
• Vibrant office with a well‑stocked pantry