Senior Backend Engineer (Hanoi, Blockchain)

Krystal | One Wallet, All DeFi

About the job

About Krystal App

Krystal is the simplest self-custodial wallet for Web3. On a single application, access cutting-edge portfolio management & market insights tools, swap & bridge tokens, earn passive income and participate in token sales via its IDO launchpad, KrystalGO. Additionally, users earn points and rewards from in-app activities as part of its loyalty program.

Krystal currently supports DeFi services on 11 blockchain networks, including Ethereum, BNB Smart Chain, Polygon, Avalanche, Fantom, Cronos, Arbitrum, Aurora, Klaytn, Solana, and Optimism. Krystal is available on both mobile apps (iOS and Android) and web apps. Our offices are located in Vietnam and Singapore.

Senior Backend Engineer - Hanoi

We are seeking a Senior Backend Engineer to join our team. The ideal candidate will have experience building scalable and high-performance backend systems. This role is critical to the success of our product, and the candidate must have a passion for software development and a desire to work in a fast-paced environment.

What you do:

- Quickly integrate with existing blockchain protocols to ensure compatibility with our project.

- Research and integrate new web3 protocols and applications.

- Build and manage data pipelines for efficient data processing and retrieval.

- Stay up-to-date with the latest developments in blockchain technology and cryptocurrency.

- Ensure code quality and perform code reviews.

- Collaborate with other developers, product managers, and stakeholders to ensure successful project delivery.

What you have:

- At least 5 years of experience in software development.

- At least 2 years of experience in blockchain development.


- Experience with building scalable systems for high-traffic environments.

- Strong experience in building event-driven systems using technologies such as Apache Kafka, RabbitMQ, or similar.

- Experience with microservices architecture and containerization.

- Strong problem-solving skills and attention to detail.

- Excellent communication and collaboration skills.

Nice to have:

- Familiar with golang

- Understand of smart contracts and experience in developing them.

- Experience in quickly integrating with DeFi protocols and applications (Uniswap, Kyberswap, Aaave, Compound, LIDOโ€ฆ)

- Knowledge of cryptography, decentralized systems, and distributed ledger technology.

- Familiarity with tools such as Truffle, Remix, and Ganache.


  • Flexible working hours, standard leave policy of 14 days/year.
  • Hybrid working time with 2 remote days/week
  • Opportunity to be offered token package in Early Stage
  • Equipment Support Package up to $3000
  • Holidays bonus, working anniversary bonus
  • Gifts for other celebrations: Lunar New Year, Mid-Autumn Festival, March 8th, June 1st, wedding day, childbirth, etc.,
  • Opportunity to be supported by the 5-million-USD Kyber Alumni Fund when starting own blockchain startup project
  • Birthday leave, Childcare leave
  • Annual health check-up at a reputable hospital. Additional Premium Health Insurance package for accident, inpatient, outpatient, and dentist expense
  • First-class facilities and working conditions, and an open, dynamic and friendly working environment, prioritizing employee development and innovation
  • Other policies: compliant with Vietnam Labor Law and Companyโ€™s Labor Regulations

*Note: We are sorry that only shortlisted candidates will be contacted. Thank you for your understanding.

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