*API Engineer contract role* Outside IR35

I am recruiting for a back-end developer with extensive 3rd party API integration experience and a keen interest in blockchain and Ethereum smart contracts

In terms of experience:

• Worked with, alongside, personal projects on the Ethereum EC721 EC1155 specs but not an expert
• We are integrating with OpenSea API - platform that enable other market places to start doing NFT sales
• Competent mid level with very strong API integration experience, what happens when the API is unavailable? What happens when the data is wrong? What security considerations do you take?
• Bonus points for Kotlin, Java Spring boot but can be any OOP

Interview process:

1. Tech test - 2 hour, github in own time, basic JSON api demonstration
2. Meet the team interview - Offer

Remote working: initially 100% remote but once world is back to normal likely to be in the Mayfair office 4 days per week