Backend Jobs in Web3

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Job Position Company Posted Location Salary Tags

Java Backend QA Engineer Whitebox Focus

Binance

Asia

Java Backend Developer

Localcoin

Toronto, Canada

$80k - $80k

Senior Backend Engineer Rust

Offchain

Remote

$122k - $150k

Backend Engineer

Layerzerolabs

Vancouver, Canada

$94k - $150k

Senior Backend Engineer Markets Engineering

Polymarket

New York, NY, United States

$106k - $110k

Senior BackEnd Engineer Trading Platm

Blockchain

Remote

$105k - $150k

Technical Lead Wallets 100% remote

Tether

Remote

Backend Engineer

Blackwing

Williamsburg, Brooklyn (Hybrid)

$150k - $250k

Backend Engineer Payment Java

Binance

Taipei, Taiwan

SDE III Backend

Inmobi

Remote

$94k - $150k

Senior Backend Engineer Exchange Systems

Polymarket

United States

$72k - $75k

Senior Backend Engineer Finapps Access

Fireblocks

Poland

$81k - $112k

Senior Backend Engineer Solana Mobile

Solana Labs

United States

$175k - $180k

Java Backend QA Engineer (White-box Focus)

Hong Kong / Asia / Taiwan, Taipei
Engineering – QA /
Full-time: Remote /
Remote

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Binance is a leading global blockchain ecosystem behind the world’s largest cryptocurrency exchange by trading volume and registered users. We are trusted by 300+ million people in 100+ countries for our industry-leading security, user fund transparency, trading engine speed, deep liquidity, and an unmatched portfolio of digital-asset products. Binance offerings range from trading and finance to education, research, payments, institutional services, Web3 features, and more. We leverage the power of digital assets and blockchain to build an inclusive financial ecosystem to advance the freedom of money and improve financial access for people around the world.

About the Role

We are looking for a passionate and curious Java Backend QA Engineer to join our team. You'll work closely with developers to ensure the quality of complex financial and Web3 products through deep technical testing — not just black-box validation, but real code-level understanding.

This is a great opportunity for a young talent who wants to grow fast in a high-impact, high-velocity fintech environment.

What You'll Do

  • Design and execute white-box and grey-box test strategies for Java-based backend services, including unit, integration, and API testing

  • Read and analyze Java source code to identify edge cases, logic flaws, and potential risk points

  • Build and maintain automated test frameworks and test tooling for financial backend systems

  • Collaborate with developers on code reviews, test coverage analysis, and CI/CD pipeline quality gates

  • Test and validate blockchain transactions, web3 wallet operations, and on-chain/off-chain data consistency

  • Investigate production issues, trace root causes through logs, DB records, and service call chains

  • Leverage AI tools (e.g., LLM-assisted test generation, log analysis, code review) to amplify testing efficiency

What We're Looking For

Required

  • 1+ years of experience in software testing or backend development

  • Solid understanding of Java — able to read, write, and debug Java code confidently

  • Hands-on experience with backend testing: REST APIs, message queues (Kafka), databases (MySQL/Redis)

  • Familiarity with microservice architectures and distributed systems concepts

  • Strong analytical mindset with attention to detail and a passion for breaking things (in a good way)

Nice to Have

  • Experience in fintech, crypto, or blockchain domain testing

  • Knowledge of web3 wallets, on-chain data, or DeFi protocols

  • Familiarity with Spring Boot, Dubbo, or similar Java frameworks

  • Experience using AI-assisted tools in daily engineering work

  • Exposure to white-box testing techniques: code coverage, mutation testing, static analysis

Why Binance
• Shape the future with the world’s leading blockchain ecosystem
• Collaborate with world-class talent in a user-centric global organization with a flat structure
• Tackle unique, fast-paced projects with autonomy in an innovative environment
• Thrive in a results-driven workplace with opportunities for career growth and continuous learning
• Competitive salary and company benefits
• Work-from-home arrangement (the arrangement may vary depending on the work nature of the business team)

Binance is committed to being an equal opportunity employer. We believe that having a diverse workforce is fundamental to our success.
By submitting a job application, you confirm that you have read and agree to our Candidate Privacy Notice.

We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.
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What does a back-end developer in Web3 do?

A back-end developer in web3 typically works on the server-side of a web application, using technologies that are specific to the decentralized web (also known as Web3-related)

This might involve building and maintaining the infrastructure that supports decentralized applications (dApps), or developing the underlying smart contracts and blockchain-based systems that power those dApps

In general, the goal of a back-end developer in web3 is to create the technologies and tools that enable users to interact with the decentralized web in a secure and seamless way.