Blockchain Developer / Fullstack Engineer (Blockchain & UI Focus)

Openorigins; London; On-site; GBP 125,000 - 150,000; Full time

Job summary

An innovative company is seeking a skilled Blockchain Engineer to join their team. In this role, you will leverage your expertise in blockchain development to create and optimize Ethereum-compatible smart contracts and build user-friendly Web3 applications. Your contributions will help ensure the security and efficiency of digital media verification through blockchain technology. This is an exciting opportunity to work at the forefront of digital media authenticity and contribute to impactful projects that shape the future of content verification. If you are passionate about blockchain and looking to make a difference, this role is perfect for you.

Qualifications

• 2+ years of experience in blockchain development and smart contract implementation.
• Strong JavaScript/TypeScript skills for frontend and Web3 interactions.

Responsibilities

• Develop and optimize Ethereum-compatible smart contracts for the firm.
• Build Web3-based UI components using JavaScript/TypeScript.

Skills

Blockchain Development

JavaScript

TypeScript

Smart Contract Security

UI/UX Design

Tools

Chainlink

Ethereum

Job description

About OpenOrigins

OpenOrigins ensures the authenticity of digital media through blockchain technology in a world where AI-generated and synthetic media are becoming the norm. OpenOrigins is at the forefront of media provenance, responsible AI adoption, and scalable content verification technologies. Our work is deeply technical, impactful, and mission-driven.

Role Overview

As a Blockchain Engineer, you will work across smart contract development and blockchain infrastructure (consensus to frontend) to make blockchain features accessible and easy to use. You will be responsible for implementing smart contract functionality, integrating tokenization and liquidity solutions (Chainlink), and building Web3-based applications.

Key Responsibilities:

1. Develop and optimize Ethereum-compatible smart contracts for OpenOrigins.
2. Secure and audit smart contracts to prevent vulnerabilities (reentrancy, transaction attacks, etc.).
3. Build Web3-based UI components using JavaScript/TypeScript.
4. Implement tokenization, Chainlink-based oracles, and liquidity pools.
5. Create secure signing functionalities for re-signing and tracking digital media over time.
6. Work closely with the product manager and DevOps Engineer to ensure smooth blockchain integration.

Requirements:

1. 2+ years of experience in blockchain development.
2. Understanding of how to deploy/update/migrate contracts.
3. Strong JavaScript/TypeScript skills for frontend and Web3 interactions.
4. Deep understanding of blockchain security principles and best practices.
5. Ability to write secure and efficient smart contract code with gas optimizations.
6. Experience working with low-level blockchain primitives: consensus, node handling, messaging protocols.
7. Strong UI/UX skills to build Web3 interfaces.

Bonus Points:

1. Experience integrating Chainlink, oracles, and smart contract-driven liquidity solutions.
2. Experience with NFTs, tokenized assets, or DAOs.
3. Contributions to open-source projects.
4. Familiarity with C2PA and media provenance tools.