Senior Engineer - Payment & Wallet

re-zoo-me; Singapore; Hybrid; SGD 120,000 - 180,000; Full time

Benefits offered by this job

Startup culture

CBD location

Annual leave

Medical coverage

Wellness programs

Office pantry

Job summary

Coinhako is seeking a Senior Engineer to join the Payments & Wallet (PAW) team. You will design, develop, and maintain high-performance services powering our payments and wallet infrastructure, collaborating with cross-functional teams to ensure seamless integration, reliability, and scalable platforms.

The role focuses on building scalable backend services with Rails 7, Go, REST and AWS, securing custody solutions for digital assets, and driving architecture decisions.

Qualifications

• 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.

Responsibilities

• 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.

Skills

Distributed systems

Ruby

Go

APIs

Blockchain security

Compliance

Ambiguity handling

Self-management

Education

Bachelor's or Master’s in CS/Engineering

Tools

Rails 7

Go

Sidekiq

REST

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 start-up 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