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 Find out more about Coinhako @https://www.coinhako.com/ and don't forget to visit our Careers Page @https://www.coinhako.com/join-us! By submitting your application to us, you consent to the collection, use, disclosure and processing of your personal data in accordance with our privacy policy, which is accessible at https://www.coinhako.com/legal/sg-1/privacy_policy.