React Jobs in Web3

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Job Position Company Posted Location Salary Tags

🤖QA Engineer APIs SDKs Contract US LATAM Spain

Crossmint

United States

$105k - $111k

Software Engineer

Flourish Health

United States

$60k - $120k

Senior Android Developer

Crypto.com

Kuala Lumpur, Malaysia

$106k - $114k

Mobile Developer Android React Native

Crypto.com

Hong Kong, Hong Kong

$106k - $107k

Mobile Developer iOS React Native

Crypto.com

Hong Kong, Hong Kong

$90k - $111k

🤖Customer Success Engineer NYC MIA Spain

Crossmint

Spain

$122k - $150k

Senior Software Engineer Ruby Rails

Zscaler

Remote

$119k - $170k

Senior Web Engineer

Trilitech

London, United Kingdom

$90k - $148k

Senior Software Engineer Full Stack

Bitcoindepot

Remote

$87k - $105k

Senior Site Reliability Engineer

MoonPay

Madrid, Spain

$115k - $117k

Frontend Engineer TS React

Getgems

Remote

$133k - $207k

Full Stack Software Engineer Bitcoin DeFi

IO Global

Remote

$108k - $115k

Web3 Full Stack Engineer

P2P. org

European Union

Senior Trading Systems Developer OMS Trader Workflow

Falconx

Remote

$90k - $115k

Crossmint
$105k - $111k estimated
United States
 Apply

🤖

QA Engineer - APIs & SDKs (Contract - US, LATAM, Spain)

If you are interested, please apply here

About Crossmint

Stablecoins and blockchains are upgrading the world’s financial system — and Crossmint lets companies harness their power with ease.
Crossmint is a one-stop-shop developer platform for building modern financial applications, from the next generation of fintechs to applications that leverage AI agent–driven commerce.
With just a few lines of code, developers can integrate programmable wallets, stablecoin payments, tokenization, on/off ramps, compliance, and agentic commerce tools — all from a single vendor, without the need for a large team of blockchain engineers.
From companies like MoneyGram and Visa to entire nation states, our more than 40,000 clients use Crossmint to launch new financial products, tokenize assets, and build applications for agentic commerce — all on fully managed infrastructure across 50+ chains.
If you want to help build the backbone of programmable finance and agentic systems, we’d love to work with you!

Location

US, Latin America, or Spain. Candidates must confirm they are able to work in alignment with ET/EST business hours.

Type of employment

Contractor role (20-40 hours per week).
Initial 3-month engagement, renewable.
Potential to convert into full-time employment.

Compensation

Per-hour setting for the contract duration.

About The Role

We’re looking for a Technical QA Engineer to join our team building APIs and SDKs for crypto infrastructure. You’ll operate at the intersection of quality assurance and technical support engineering, ensuring our APIs and SDKs are robust, reliable, and intuitive for developers.
Quality Assurance
Design comprehensive test plans and cases based on product requirements.
Execute manual and automated tests across multiple platforms and edge cases.
Validate end-to-end functionality across Wallets, Payments, and Minting products.
Document results and proactively communicate issues to engineering teams.
Technical Support Engineering
Evaluate developer experience for API and SDK integrations.
Act as a technical escalation point for complex or hard-to-reproduce issues.
Reproduce, debug, and analyze issues; provide detailed technical insights to accelerate fixes.
Technical Development
Build and maintain demo applications for testing API/SDK functionality.
Contribute to internal tools and scripts that improve QA and debugging workflows.

About you

Technical Expertise
Essential: Strong knowledge of REST APIs and SDKs.
Proficiency in one or more modern programming languages (JavaScript/TypeScript, Python, or similar).
Ability to build small apps or prototypes to test integrations.
Big bonus: experience with React or React Native.
Quality Assurance Background
Proven experience writing test plans, test cases, and executing both manual and automated tests.
Familiar with QA methodologies and frameworks (e.g., Postman/Bruno/cURL, Jest, Cypress, etc.).
Problem-Solving Mindset
Skilled at debugging and troubleshooting hard-to-reproduce issues.
Clear and effective communicator, especially when relaying technical details to engineering teams.
Nice to Have
Experience with blockchain technologies, crypto wallets, or payment APIs.
Understanding of developer experience best practices.

Our Principles

Results and delivery: Ship high quality work fast.
Build for the long term: Build scalable, secure, and reliable solutions. Use AI.
Extreme Ownership: Be an effective Directly Responsible Individual (DRI). Be proactive.
Be a team player: Be an effective and kind colleague providing credible challenge. Be present and reliable.
Talent research indicates that women are often less inclined than men to apply for a role unless they have experience in 100% of the listed skills. However, this list is only a guide. We welcome your application even if you feel you meet around 75% of the requirements. At Crossmint, we believe skills can be learned, and diversity makes us stronger.
We work to foster a respectful environment where each person can be their authentic self, free from harassment, racism, and any form of discrimination. We proudly uphold our commitment to diversity and inclusion as an equal opportunity employer, and this policy applies to all employment practices within our organization.
Please note that Crossmint never conducts AI-based interviews, and all of our processes include an initial video call with a team member. Crossmint will not request your personal identification documents or any payment at any point during your interview process. Please stay vigilant about potential fraud. If you receive an email that claims to be from Crossmint but ends with any domain other than @crossmint.com, @crossmint.io or @paella.dev, it is not from us. We own these three domains listed before, and they are the only legitimate ones.
Please let our Talent Team know if you need any assistance completing any forms, or participating in the process.

If you are interested, please apply here

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Apply Now

What does a React developer in web3 do?

A React developer in the context of web3 is a developer who is using the React JavaScript library to build user interfaces for decentralized applications (dApps) that run on the Ethereum blockchain

These dApps often use smart contracts to facilitate transactions and other interactions on the Ethereum network

Overall, the role of a React developer in web3 involves using your skills in React development to help build cutting-edge decentralized applications that leverage the power of the Ethereum blockchain

As a React developer in web3, some of your responsibilities might include:

  • Integrating the dApp with the Ethereum blockchain. This might involve using tools like web3.js and Ethers.js to connect to the Ethereum network and interact with smart contracts.
  • Building the user interface for a dApp using React. This could involve creating components for the various elements of the dApp, such as buttons, forms, and other input elements.
  • Implementing features that are specific to decentralized applications, such as handling cryptocurrency transactions and displaying data from the blockchain in a user-friendly way.
  • Collaborating with other members of the development team, such as blockchain engineers and designers, to ensure that the dApp functions properly and meets the needs of the end users.