large_Solidity Q&A.jpg

medium_Solidity Q&A.jpg

small_Solidity Q&A.jpg

thumbnail_Solidity Q&A.jpg

Solidity Q&A.jpg

Solidity Interview Questions and Answers Explained (2025)

large_solidity dev.jpg

medium_solidity dev.jpg

small_solidity dev.jpg

thumbnail_solidity dev.jpg

solidity dev.jpg

How to Become a Solidity Developer?

6 Solidity Courses & Programs: Learn Solidity with CryptoJobsList

·     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:Nika is building the future of wealth management—a platform that simplifies digital asset investing for everyone. Our vision is bold: become the one-stop shop for asset management. Our mission is clear: democratize access to professional-grade solutions and empower wealth creation for all.We’re backed. We have audited products. We move fast. What We Value:<ul><li>Move fast, argue hard, disagree transparently</li><li>Precision over polish</li><li>Relentless self-learning</li><li>Extreme ownership and accountability</li><li>DeFi-native thinking meets first-principles engineering</li><li>Be selective to be effective</li><li>Seek excellence</li><li>Build dream teams</li></ul>What You’ll Do:<ul><li>Own and scale Nika’s technical foundation—smart contracts, backend, frontend, etc.</li><li>Architect chain-agnostic infrastructure across VMs (EVM, SVM, etc.)</li><li>Write production-grade contracts (Solidity/Rust), backend services, middleware, and frontend apps</li><li>Set up and manage DevOps: CI/CD pipelines, observability, multisig ops, RPC failover, and security infra</li><li>Drive strategic and technical decisions on product architecture, tradeoffs, and roadmap</li><li>Hire and lead a high-performance engineering team</li><li>Set the bar on speed, security, and culture</li><li>Work directly with the founder—challenge and be challenged </li><li>Architect, ship, and iterate—fast</li></ul>Who You Are:Mindset & Execution<ul><li>Operate at founder speed—high agency, high output</li><li>Thrive in ambiguity and under pressure</li><li>Think from first principles and break down complex problems quickly</li><li>Execute without permission and solve problems without drama</li><li>Own outcomes—no excuses</li><li>Comfortable debating hard questions with conviction</li><li>Love solving complex problems and thrive on ownership</li><li>Resilient, agile, and proactive—you don’t wait to be told </li><li>Security first mindset and startup energy</li><li>You can lead but also ship</li><li>Determination—when presented with a challenge, you solve it</li></ul>Technical Must-Haves<ul><li>Built or architected real DeFi systems (vaults, lending, AMMs, etc.) or TradFi Equivalents</li><li>Deep experience writing secure, optimized smart contracts</li><li>Architected full-stack or protocol infrastructure (contracts, backend, DevOps, etc.)</li><li>Familiar with security best practices: multisigs, key management, monitoring, incident response</li><li>Understand contract patterns: MEV resistance, upgradeability, oracles, bonding curves, etc.</li></ul>Bonus Points:<ul><li>Previous founder or founding engineer</li><li>Quant, math, or HFT background</li><li>Strong network to recruit world-class engineers</li><li>Contributor to DeFi protocols or tooling</li><li>Understanding of market microstructure: AMMs, order books, derivatives, etc.</li><li>Fluent in Rust, Solidity, Go, TypeScript, Python</li><li>Experience with tools like Foundry, Hardhat, Kubernetes, Tenderly, Grafana, Dune, Safe, Snapshot</li></ul>Why Join Us?<ul><li>Full ownership—you own the tech, end to end</li><li>Massive surface area—smart contracts, infra, architecture, product, hiring, etc.</li><li>Skin in the game—shape what gets built, why, and how fast</li><li>Foundational role—this is the beginning of the future, you’ll be core to it</li><li>Limitless upside—complex problems, true autonomy, real growth</li><li>Fast iteration—ship at the speed of light</li><li>Meaningful equity & competitive salary</li><li>Paid travel</li></ul>*This role is onsite and requires candidates to be authorized to work in the U.S.*We also offer a $5,000 referral bonus for successful hires—feel free to reach out for details.

Lead Engineer

Eastern Standard Time

Binance is a leading global blockchain ecosystem behind the world’s largest cryptocurrency exchange by trading volume and registered users. We are trusted by over 230 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 Pioneer Talent Program Are you an early-career professional ready to kickstart your career in the dynamic world of blockchain? Binance’s Pioneer Talent Program is designed to nurture ambitious individuals like you. The program offers full-time roles where participants will gain hands-on expertise via a tailored training curriculum and personalized 1:1 mentorship from industry leaders. Dive behind the scenes of the world’s leading blockchain ecosystem while building the skills to thrive in Web3. Launch your career with purpose—join us in shaping the future of digital innovation.  Who May ApplyCandidates with up to 5 years of relevant work experience<h3>Responsibilities</h3><ul><ul><li>Enhance and maintain the security postures of Binance’s affiliates specializing in DeFi and Web3</li><li>Serve as the first responder for security issues identified through penetration tests, bug bounty programs, and assessments</li><li>Analyze penetration test findings and implement code-level solutions to resolve vulnerabilities</li><li>Collaborate on engineering architecture design, suggesting improvements to system security</li><li>Integrate third-party blockchain security vendor solutions to enhance overall protection</li><li>Evaluate and incorporate AI tools for security issue detection throughout the SDLC, automating these processes in CI pipelines</li></ul></ul><h3>Requirements</h3><ul><ul><li>2+ years of full-time iOS development experience, or experience developing mobile applications using Kotlin and Java with the Android SDK</li><li>Solid experience in at least two technical languages in Java/Swift/Kotlin/Go/Python/Rust</li><li>Experience developing client-server applications with secure communication protocols</li><li>Familiar with mobile security techniques, common weaknesses and mitigations</li><li>Passion for cryptocurrency, DeFi, smart contracts, and blockchain security</li><li>Team player with a quick-learning mindset</li><li>Strong problem-solving skills and the ability to work independently</li></ul></ul><h3>Nice to Have</h3><ul><ul><li>Experience with bug bounty programs</li><li>Knowledge of blockchains, DeFi design patterns, wallet security and common Web3 security vulnerabilities</li><li>Hands-on experience with smart contract auditing and development in Solidity or Rust</li><li>Active GitHub portfolio or contributions to popular libraries/projects</li></ul></ul>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 <a href="https://www.binance.com/en/candidate/privacy/notice" rel="noopener noreferrer nofollow ugc" target="_blank">Candidate Privacy Notice</a>.

Pioneer Talent Program - Application Security Engineer

Eastern 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

Find jobs that require Solidity programming skills at startups and mature companies in the cryptocurrency industry.

Page 2. July 2025. 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
N Lead Engineer	Nika Finance		Remote	DeveloperEngineeringPythonRust
Pioneer Talent Program - Application Security Engineer	Binance		📍 Bulgaria, Sofia, Romania, Bucharest	Web3ResearchDeveloperTrading
VP, Blockchain Security Engineer	Galaxy			RemoteWeb3ResearchDeveloper

Page 2. Solidity jobs

Expired Solidity Jobs.

Past and filled jobs:

Dev Smart Contract Solidity – DeFi Senior

at dexapp

Hiring Solidity Talent?