·     7+ years of Solidity, DeFi, and smart contract development<ul><li class="ql-indent-1">Foundry expertise (development & testing)</li><li class="ql-indent-1">Mastery of ERC-20 / 721 / 4626 standards</li><li class="ql-indent-1">Smart contract security (Polygon/Base, best practices & audits)</li><li class="ql-indent-1">Complex tokenomics design</li></ul>·     7+ years of DeFi experience<ul><li class="ql-indent-1">Yield farming / vault strategies (ERC-4626)</li><li class="ql-indent-1">AMM & liquidity provision (Balancer, Uniswap, etc.)</li><li class="ql-indent-1">Gas optimization, solid mathematics</li></ul>Autonomous, rigorous, technical documentation & communicationFluent in French or EnglishWeb : dapp.121metadex.com

Dev Smart Contract Solidity – DeFi Senior

<h3>Description</h3>We are looking for an experienced Solidity developer to work with our Rust-based team building cutting edge AVS-infrastructure. Your work will involve writing contracts and deploy scripts, and helping Rust devs properly interface with these contracts. We are building a multi-chain protocol based on Eigenlayer restaking, and you will are expected to have deeper EVM/Ethereum knowledge than any other teammate. You should feel comfortable making architecture decisions and recommendations on best integrations with Ethereum and other EVM-based chains.Responsibilities:<ul><li>Writing secure Solidity Contracts</li><li>Extending eigenlayer-middleware contracts</li><li>Writing deploy scripts (solidity / bash / foundry)</li><li>Providing solidity interfaces to the Rust team</li><li>Participating in architectural discussions</li><li>Providing recommendations on Solidity/Ethereum best practices</li><li>Properly testing our Solidity-based infrastructure</li></ul><h3>Requirements</h3><ul><li>5+ years of professional software development</li><li>2+ years of production work on Solidity / Ethereum</li><li>Experience with TDD and CI workflows</li><li>Basic working knowledge of Rust</li><li>Working knowledge of bash scripts</li><li>Within 1 hour of CET timezone</li><li>Good written and spoken communication in English</li><li>Experience working in a remote team</li></ul>Company Overview - Layer LabsLayer is a fast-growing Web3 startup, launched in September 2024, with the mission to enable developers to build an entirely decentralized stack and create novel applications. We develop a Rust-based blockchain stack that supports decentralized compute for AVSs, GPU, storage, and ZK proofs, paving the way for the future of the web3 ecosystem. Our vision is to resurrect the true principles of web3, creating a trust-based, decentralized internet and shifting away from techno-feudalism. Recently, Layer announced a seed fundraising round of $6 million, with a valuation of $72 million, solidifying our position as a leader in decentralized infrastructure innovation.Layer was co-founded by three blockchain pioneers:<ul><li>Jake Hartnell (CEO), who previously co-founded Juno, Stargaze and DAO DAO;</li><li>Sam Cassatt (CBO), former Chief Strategy Officer at ConsenSys; and</li><li>Ethan Frey (CTO), founder of CosmWasm and architect of key protocols like IBC for the Cosmos ecosystem.</li></ul><h3>Benefits</h3>This is an hourly rate, contract-based position. Our Culture:<ul><li>You’ll be hands-on, collaborating, and learning right away. We embrace creative complexity together.</li><li>We are a full-stack organization with a strong engineering culture, which values open-source.</li></ul>What We Offer:<ul><li>Remote working environment</li><li>International, collaborative team</li><li>Competitive fees</li></ul>

Senior Solidity Developer (plus Rust)

Central European Time

Who We Are:
At Galaxy we are building products and services to help the world invest in economic progress. We believe crypto and blockchain innovations will permeate and improve all aspects of our global economy. Our vision is a society where value and ownership flow as freely as information. Galaxy is a digital asset and blockchain leader helping institutions, startups, and individuals access and navigate the crypto economy. As one of the most well-capitalized and trusted companies in the industry, we provide platform solutions custom-made for a digitally native ecosystem across three complementary operating businesses: Global Markets, Asset Management, and Digital Infrastructure Solutions. Our offerings include, amongst others, trading, lending, strategic advisory services, institutional-grade investment solutions across passive, active and venture strategies, proprietary bitcoin mining and hosting services, network validator services, and the development of enterprise custodial technology. Galaxy’s CEO and Founder Michael Novogratz leads a team of crypto enthusiasts, and institutional veterans focused on the future of finance and Web3. The Company is headquartered in New York City, with global offices across North America, Europe and Asia.
Additional information about the Company's businesses and products is available on www.galaxy.com.
What We Value:
We are a diverse team of free thinkers, and fast movers united to help investors and creators energize the global economy. We are looking for individuals who thrive in a culture of builders and overachievers and embrace high performance, transparent feedback, and a mission-first approach. Our culture shapes our way of working and gets us where we want to be.
<ul>
<li>Seek Excellence.</li>
<li>Be Selective To Be Effective.</li>
<li>Be Highly Aligned, Loosely Coupled.</li>
<li>Disagree Transparently.</li>
<li>Encourage Independent Decision-Making.</li>
<li>Build Dream Teams.</li>
</ul>Who You Are:
Working in tight collaboration with the on-chain business teams, the blockchain security engineer will assess the security of the various architectures involved in on-chain projects and require appropriate controls to reach an acceptable level of risk. The assessment will consists of activities such as: threat modeling, code review, security testing, cloud/server posture assessment. 
As a member of the product security team, the engineer will be able to collaborate with team members to improve the existing blockchain assessment model. 
We are open to candidates having limited exposure on blockchain technologies who would show a strong interest in learning. It is key that the candidate has programming experience in an enterprise setting in order to review complex code artifacts and implement some of the required security controls.

What You’ll Do:
<ul>
<li>Perform security activities for new projects and updates to existing projects of the on-chain business team</li>
<li>Enhance the existing blockchain assessment model, with guidance from the existing product security engineers</li>
<li>Research key aspects of the various blockchains used by the on-chain business team</li>
<li>Security-oriented code review, enhanced with automated security scanning tools (SAST) E.g. review Rust server, Solana smart contract, Solidity smart contract</li>
<li>Implement some of the security controls required by the assessment, when such control can be reused across architectures</li>
<li>Knowledge of security best practices, including encryption, access control, OWASP top 10, and network security</li>
</ul>
What We’re Looking For:
<ul>
<li>Bachelor's degree in Engineering, Computer Science, or a related field.</li>
<li>A minimum of 6 years of experience in technology or IT/Security department</li>
<li>At least 3 years of hands-on programming experience in languages such as Python, Rust, Go or similar</li>
<li>Strong knowledge of secure software development lifecycle (SDLC) practices.</li>
<li>Demonstrated experience in building and shipping software in modern/microservices architectures</li>
<li>Knowledge of blockchain technology</li>
<li>In depth understanding of at least a few of the following topics: authentication and authorization technology, TLS and PKI, network security, cloud security, system security, application security</li>
<li>Possession of a recognized security of cloud certifications</li>
<li>Excellent problem-solving skills and attention to detail</li>
<li>Strong communication skills</li>
<li>Ability to work collaboratively in a fast-paced, dynamic environment</li>
</ul>
Bonus Points:
<ul>
<li>Experience with digital asset custody solutions and security best practices</li>
<li>Familiarity with additional blockchains (Cosmos et al) and layer2 strategies (Eigen), and/or other web3/blockchain ecosystems.</li>
</ul>
What We Offer:
<ul>
<li>Competitive base salary and bonus</li>
<li>Flexible Time Off (paid)</li>
<li>3% 401(k) company contribution</li>
<li>Company-paid health and protective benefits for employees, partners, and other dependents</li>
<li>Generous paid Parental Leave</li>
<li>Free virtual coaching and counseling sessions through Ginger</li>
<li>Opportunities to learn about the Crypto industry</li>
<li>Free daily snacks in-office</li>
<li>Smart, entrepreneurial, and fun colleagues</li>
<li>Employee Resource Groups</li>
</ul>
*Benefits may vary depending on location.Galaxy respects diversity and seeks to provide equal employment opportunities to all employees and job applicants for employment without regard to actual or perceived age, race, color, creed, religion, sex or gender (including pregnancy, childbirth, lactation and related medical conditions), gender identity or gender expression (including transgender status), sexual orientation, marital or partnership or caregiver status, ancestry, national origin, citizenship status, disability, military or veteran status, protected medical condition as defined by applicable state or local law, genetic information or predisposing genetic characteristic, or other characteristic protected by applicable federal, state, or local laws and ordinances.
We will endeavor to make a reasonable accommodation to the known limitations of a qualified applicant with a disability unless the accommodation would impose an undue hardship on the operation of our business. If you believe you require such assistance to complete the application process or to participate in an interview, please contact

VP, Blockchain Security Engineer

About SapienWe're not just building a company; we're creating new opportunities in AI development and data labeling. You'll play a key role in shaping the future of how humans and AI collaborate.Join a disciplined and rigorous team building cutting-edge technology featuring gamification, beautiful UI, and a clean, well-documented codebase.The Role: Staff Web3 EngineerSapien is seeking a Staff Web3 Engineer to take a lead role in architecting and accelerating the development of our blockchain-integrated systems. This is an ideal opportunity for a senior engineer who thrives in a fast-moving, remote-first environment and values both ownership and collaboration.We’re looking for a full-stack expert with deep experience in smart contract development (EVM) and web2/database-driven applications. You’ll help drive technical strategy, mentor developers, and ensure smooth integration between smart contracts, APIs, and frontend experiences.Key Responsibilities:* Architect, build, test, and deploy smart contracts to testnets and mainnets* Lead web3 integrations with partners and contribute to go-to-market efforts alongside the business team* Guide and review React frontend implementations that interface with smart contracts* Ensure a clean, maintainable, and well-tested codebase* Support cross-functional teams with technical decision-making and unblock teammates when neededAn ideal candidate will:* Operate independently and confidently at a senior level, while collaborating effectively with designers, engineers, and product leads* Have deep experience with smart contract development (Solidity or similar) and familiarity with security best practices* Be highly proficient in full-stack engineering, including backend development and working with relational databases like Postgres* Have a strong eye for UI/UX and be able to make informed design and implementation decisions when specs are incomplete* Know how to balance speed and quality, delivering clean code that’s tested and documented* Understand the performance implications of frontend/backend architecture and build responsive, performant applications* Be a clear communicator who knows when to ask questions, raise flags, or offer guidanceWhy Join Sapien?At Sapien, you’ll be part of a vibrant and innovative team dedicated to making a real impact in the AI ecosystem. We value creativity, autonomy, and craftsmanship. As a Staff Engineer, your contributions will shape the direction of our technology and culture. If you’re passionate about building scalable, elegant systems at the intersection of web2 and web3, we’d love to hear from you.Apply now to become a key player in advancing Sapien’s mission!

Staff Web3 Engineer

Binance is the global blockchain company behind the world’s largest digital asset exchange by trading volume and users, serving a greater mission to accelerate cryptocurrency adoption and increase the freedom of money.Are you looking to be a part of the most influential company in the blockchain industry and contribute to the crypto-currency revolution that is changing the world?This role represents a unique opportunity for those ambitious marketers looking to understand the bigger picture of the broader mobile paid user acquisition space.As a Paid Media Specialist, you’ll be hands-on with most major paid ads platforms, including Google Ads, Meta, X, TikTok, Programmatic networks and more. You will assist in creative ideation, A/B testing, bid optimization and data analysis, all while ensuring cross-channel consistency in Binance’s communications and acquisition strategies. Bonus if you bring creative flair and can craft compelling narratives about Binance’s products.You’ll be working hand-in-hand with a full team of experienced performance marketers, and will report to the Paid Ads team lead. All whilst receiving full support from external stakeholders such as graphic and motion designers, data analysts, adtech engineers, PMMs, legal, localization, and regional marketing and operations teams.About Binance Accelerator Program Binance Accelerator Program is a concise fixed-term program designed for Early Career Talent to have an immersive experience in the rapidly expanding Web3 space. You will be given the opportunity to experience life at Binance and understand what goes on behind the scenes of the worlds’ leading blockchain ecosystem. Alongside your job, there will also be a focus on networking and development, which will expand your professional network and build transferable skills to propel you forward in your career. Learn about BAP Program <a href="https://www.binance.com/en/blog/all/early-career-program-how-binance-gears-up-early-career-talent-3048651" rel="noopener noreferrer nofollow ugc" target="_blank">HERE</a> Who may apply: Current university students and recent graduates.<h3>Responsibilities: </h3><ul><ul><li>Support the paid media management team on daily implementation and optimization tasks including, but not limited to campaign launches, bid optimization, AB testing, content ideation and reporting;</li><li>Ensure solidity and coherence in cross-channel communication strategies;</li><li>Assist our paid ads project manager on the management of ad hoc campaigns, eventually leading end-to-end campaign launch processes on their own.</li></ul></ul><h3>Requiremenents:</h3><ul><ul><li>Fluency in English is required to be able to coordinate with overseas partners and stakeholders. Additional languages would be an advantage;</li><li>At least one year of experience managing any kind of paid advertising digital campaign, with a proven track record of meeting or exceeding KPI targets (CPI, CAC, ROAS);</li><li>Proficiency in at least two of the following paid ad channels: Google Ads, Meta, TikTok, X or programmatic networks (the more, the better);</li><li>Strong analytical mindset with the ability to draw solid conclusions from a given dataset;</li><li>Experience conducting A/B tests across paid channels;</li><li>Experience collaborating with cross-functional teams and translating their work into effective campaign ideas;</li><li>Crypto enthusiast;</li><li>Proactive mindset: not afraid of taking new challenges and ask for help.</li></ul></ul><h3>Preferred Qualification:</h3><ul><ul><li>You have managed paid campaigns in-house for a fintech app, in multiple markets and across regions;</li><li>You have worked at a very fast-growing startup;</li><li>You feel comfortable working in a fully remote team environment.</li></ul></ul>

Binance Accelerator Program - Paid Media

Rand

Eastern Cape

Africa/Johannesburg

Remote Web3 Solidity jobs and other crypto companies

Page 2. July 2025. Remote Web3 Solidity Jobs. Apply for. careers at and other crypto companies... Apply today!

Job Title	Company Name	Salary	Location	Tags
d Dev Smart Contract Solidity – DeFi Senior	dexapp	5k-10k/month	📍 Remote	DeveloperDeFiSolidityFull Time
Senior Solidity Developer (plus Rust)	Layer Labs		📍 100% remote. CET +/- 1 hour time zone	DeveloperEngineeringRemoteRust
VP, Blockchain Security Engineer	Galaxy			RemoteWeb3ResearchDeveloper
Staff Web3 Engineer	Sapien		Remote	RemoteWeb3DeveloperEngineering
Binance Accelerator Program - Paid Media	Binance	70k-100k/year	📍 Europe, Eastern Europe	Web3DeveloperMarketingTrading

Page 2. Remote Web3 Solidity Jobs

Expired Solidity Jobs.

Past and filled jobs:

Dev Smart Contract Solidity – DeFi Senior

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