Solidity jobs in crypto and blockchain companies

Welcome to Playmate, your trusted partner in creating stunning, functional, and user-friendly websites that drive results. With a passion for innovation and a commitment to excellence, we are here to transform your online presence and help you achieve your digital goals.The RoleYou Will Be Responsible For Writing well-designed, testable and efficient code. Gathering and evaluating user feedback. Working as a part of a dynamic team to deliver winning products. Providing code documentation and other inputs to technical documents. Supporting continuous improvement by investigating alternatives and new technologies and presenting these for architectural review. Troubleshooting and debugging to optimise performance. Leading the design, creation, and implementation of a suite of software. Building a strong blockchain product offering. Ideal Profile You possess a Degree/Diploma in Computer Science, Engineering or related field. You have at least 3 year experience, ideally within a Software Architect or Software Engineer role. You have working knowledge of Web3, Solidity, Smart contract, Crypto and Ethereum You are highly goal driven and work well in fast paced environments You possess strong analytical skills and are comfortable dealing with numerical data You are a self-starter and demonstrate a high level of resilience What's on Offer? Work alongside & learn from best in class talent Flexible working options Attractive salary & benefits   The interview process     Coding test. Meet with CTO Final interview.     Salary     First 3 months: 12k - 16k USD 3+ months: 16k - 20k USD

Parity is one of the world's most experienced core blockchain infrastructure companies, having built and pioneered some of the most advanced technologies in the blockchain sector. Parity was founded by Dr. Gavin Wood, co-founder and former CTO of Ethereum, the primary engineer behind the Ethereum Virtual Machine (EVM), inventor of the Solidity programming language, and primary author of the Ethereum Yellowpaper. Based in Berlin, London, and Lisbon, Parity has built clients for Ethereum, Bitcoin, and Zcash and has pioneered a completely new, next-generation blockchain protocol with Polkadot and the framework it’s built with, Substrate. Parity builds the open-source technologies needed to power an unstoppable, decentralised web—known as Web3—and helps developers and organisations implement and build upon the Web3 tech stack. With a remote-first, global team, Parity is building open-source technologies for developers and organisations to implement and build upon. Our Web3 tech stack includes Polkadot, Substrate, and Kusama. People in our collective are: Highly motivated to contribute to Parity’s mission and be part of something bigger Excited to work on projects that are groundbreaking and complex Autonomous workers that self-initiate, but also collaborate well with others Taking maximum accountability and having minimum ego at work Comfortable with chaos and adapting to the ever-changing Web3 space Continuously educating themselves about Parity and the wider ecosystem About the team: We are a small, curious, tight knit People Partner team working independently within a larger People team. We have had an exciting and transformative year setting up levelling within the organisation, revamping our compensation structure and implementing a performance review process. In 2025 we have similarly big plans and want to work on our learning & development offering, improving our onboarding & offboarding experience and making Parity a more inclusive space to work. About the position: Be a strategic partner and advisor to team leads on various people topics including employee relations, performance management, conflict resolution, compensation  Coach managers on applying best practices to drive performance and team development Own, collaborate and deliver people & culture projects such as onboarding, learning and development, and offboarding Support organisational change and engagement aligned with the company's strategic objectives. Optimise processes to improve internal team operations and the overall employee experience Collaborate with other support teams such as Finance, People Operations, Talent, Communications  and Operations About you: Excellent interpersonal and communication skills, with the ability to influence and build strong relationships at all levels. Excellent problem-solving skills  Ability to leverage data and metrics to drive data-based decision making. Experience working either as a people partner, people ops or a similar role within a people function Collaborative and motivated to work closely with other teams. Practical knowledge of employee labour laws in either one or more of these jurisdictions: Germany, UK, Switzerland or Portugal   About working for us: Competitive remuneration packages based on iterative market research, including tokens (where legally possible) “Future of work” environment that’s remote-first and self-initiating with flexible hours Team mates that are genuinely excited about their impact and projects Access to the brightest minds in this space to learn about Web3 and develop your skills and knowledge while on the job Becoming part of the wider ecosystem (career and networking opportunities) Team and company-wide retreats Work laptop   Those joining our collective as an employee in Germany, Portugal, and the U.K. also enjoy benefits such as health care, parental leave, PTO (28 days per year) and local team events Parity is an Equal Opportunity Employer. We welcome diversity in our global team and care about everyone in our collective feeling included and welcome.   View our Applicant Notice to see how we use your data. Is this position not quite your match? Browse our other open roles.

About the CompanyHi, we're Ondo Finance. Our mission is to provide institutional-grade, blockchain-enabled investment products and services. We have both a technology arm that develops decentralized finance technology, and an asset management arm that creates and manages tokenized funds. We were the first company to tokenize exposure to US Treasuries, and have since expanded into several other assets. We are also focused on incubating protocols that can support both tokenized real-world assets and traditional crypto.Founded by folks from Goldman Sachs Digital Assets Team, we’re backed by some of the best investors in the world including Founders Fund, Coinbase Ventures, Pantera Capital, Tiger Global, and more. We are currently the leaders in the space in terms of AUM and are well capitalized to continue growing the firm. We're fully remote, with team members across the U.S.About the RoleAs a Smart Contract Engineer at Ondo, you will be at the forefront of developing and optimizing smart contracts that power Real World Asset (RWA) tokenization. You will design and implement secure, efficient, and scalable smart contract solutions across many blockchain ecosystems.In this role, you will collaborate with cross-functional teams, including product, legal, and compliance, to ensure the contracts are not only technically sound but also aligned with regulatory standards. You’ll tackle complex challenges around asset tokenization, security, novel token bridging solutions, novel DeFi protocols, and DeFi interoperability. You will play a pivotal role in expanding Ondo’s suite of products and paving the way for large-scale blockchain adoption by traditional financial institutions.This is a unique opportunity to help shape the future of finance by creating smart contract solutions that bring real-world assets on-chain, driving innovation and transforming financial markets.Responsibilities•Smart Contract and Protocol Development: Drive the development of new chain deployments, novel DeFi interoperability and bridging solutions, and DeFi protocols for Ondo Finance’s ever-evolving product suite.•Technical Leadership: Serve as a tech lead and subject matter expert for blockchain projects, guiding the engineering team in delivering high-impact, scalable solutions while making sound technical decisions that align with long-term goals.Requirements•Based in PT, MT, CT, or ET time zones.•Excellent technical and non-technical communication skills, verbal and written.•Bachelor's degree in Computer Science, Engineering, or a related technical field.•5+ years of software engineering experience.•Minimum of 3+ years of experience working in blockchain engineering, ideally coming from another Defi Protocol live on multiple chains.•A strong competency with Solidity and other non-EVM smart contract languages.•Proven results in building and scaling a Defi protocol.•Strong technical grasp and excellent judgment on task prioritizations.•Strong emphasis on understanding the “why” behind requirements and commitment defining the “minimum scope”.What we offer:•Competitive compensation including salary, future token rights, and/or equity (according to your preferences) — we're well-funded and believe that great talent deserves great compensation.•Full benefits (medical, vision, and dental) and flexible vacation policy (PTO).•Small remote-first team across many countries — you'll be an early team member helping shape our vision, culture, and design practices.•A+ colleagues — our team includes alumni from Goldman Sachs Digital Assets, SpaceX, AWS, DeFi protocols like BadgerDAO, private equity funds, hedge funds, and various VC-backed startups.•Best-in-class investors — we are proud to be backed by leading crypto experts (incl. founders of Aave, Quantstamp, and Anchorage) and funds (incl. Pantera, Genesis, DCG, Coin Fund, and CMS).

About Us Parity is one of the world's most experienced core blockchain infrastructure companies, having built and pioneered some of the most advanced technologies in the blockchain sector. Parity was founded by Dr. Gavin Wood, co-founder and former CTO of Ethereum, the primary engineer behind the Ethereum Virtual Machine (EVM), inventor of the Solidity programming language, and primary author of the Ethereum Yellowpaper. People in Our Collective Are Highly motivated to contribute to Parity’s mission and be part of something bigger Excited to work on projects that are groundbreaking and complex Autonomous workers that self-initiate, but also collaborate well with others Taking maximum accountability and having minimum ego at work Comfortable with chaos and adapting to the ever-changing Web3 space Continuously educating themselves about Parity and the wider ecosystem About the Team The Parity DevOps team is part of the Parity Infrastructure & Data department, made of more than 20 people. We are remote-first, but can also work from offices in Berlin, Lisbon, and London About the Position As the DevOps/SRE Team Lead, you will lead a team of 5 DevOps/SRE engineers responsible for maintaining the infrastructure and tools that support the development of Parity’s Polkadot SDK. Within the Product Engineering department, you will collaborate closely with cross-functional teams to ensure the reliability, scalability, and security of our systems. Your leadership and expertise will play a crucial role in advancing automation, enhancing efficiency, and optimising the performance of our entire technology stack. Lead a team of DevOps engineers, providing guidance, mentorship, and support Define and implement best practices for infrastructure automation, continuous delivery and cloud operations Provide strategic direction and contribute to the overall technology roadmap Drive the adoption of DevOps culture, practices, and tools across the organisation Collaborate with software development teams to streamline the build, deployment, and release processes Establish and maintain robust monitoring, alerting, and logging systems to ensure system reliability and availability Continuously evaluate and implement new technologies and tools to improve efficiency and productivity Liaise with stakeholders to gather requirements, prioritise projects, and communicate progress About You Strong leadership and team management skills, with the ability to inspire and motivate others Strong understanding of containerization technologies such as Docker and orchestration tools like Kubernetes Experience with multiple cloud providers such as AWS, GCP, Azure, DigitalOcean, OVH, Scaleway, etc. Experience leveraging Infrastructure as Code (eg. Terraform, Ansible) and GitOps (eg. ArgoCD, FluxCD) tooling. Expertise in Linux-based systems Proven experience managing infrastructure teams, and  overseeing large scalable, resilient and observable systems Strong communication, collaboration, and interpersonal skills About Working for Us Competitive remuneration packages based on iterative market research, including tokens (where legally possible) “Future of work” environment that’s remote-first and self-initiating with flexible hours Team mates that are genuinely excited about their impact and projects Access to the brightest minds in this space to learn about Web3 and develop your skills and knowledge while on the job Becoming part of the wider ecosystem (career and networking opportunities) Team and company-wide retreats Work laptop Opportunity to relocate to Germany or Portugal (with visa sponsorship) Those joining our collective as an employee in Germany, Portugal, and the UK, also enjoy benefits such as healthcare, parental leave, PTO (28 days per year) and local team events. Parity is an Equal Opportunity Employer. We welcome diversity in our global team and care about everyone in our collective feeling included and welcome. View our Applicant Notice to see how we use your data. Is this position not quite your match? Browse our other open roles.

About us Founded in 2015 with the mission to protect the open economy, OpenZeppelin is the world leader in securing blockchain applications and smart contracts.  Its bedrock open source Contract Libraries are a public good and industry standard for smart contract development. OpenZeppelin’s professional expertise, unified with the Defender developer security platform, integrates through clients’ development lifecycles, so teams can plan, code, audit, deploy and operate projects faster and more safely. Please note: Always refer to OpenZeppelin's official job page for the most accurate information about our open roles, as we have seen multiple third party job sites posting inaccurate information. About the role: OpenZeppelin is seeking an experienced, customer-facing Technical Project Manager with a proven track record of delivering on time to join the Security Research team and take ownership of the entire security audit delivery process.  This person will work closely with other constituencies across the organization including the Sales, Marketing, Operations, and Executive Leadership teams. What you'll be doing: Own and nurture relationships with OpenZeppelin’s client base. Respond to inquiries from existing customers, ensuring client retention and satisfaction. Establish trusted relationships with each client to drive continued value from our products and services. Ensure that clients' technical needs are met and exceeded. Follow up on client interactions to identify and develop new business opportunities. Lead client kick-off meetings and serve as the primary point of contact for all communications throughout the delivery process. Manage scope creep by utilizing a structured change order process, ensuring project scope remains controlled and clearly defined. Evaluate and escalate issues to management as necessary, facilitating prompt and effective resolution. Oversee the entire end-to-end process of client deliveries, including final review and coordination of publishing. Collaborate with Security Research team leaders to manage and ensure quality control throughout the project lifecycle. Monitor team performance against key metrics, such as resource utilization and allocation, to ensure optimal efficiency and project success. Automate and enhance the delivery process using our internal tools (GitHub, Notion, Slack, HubSpot) to improve efficiency and streamline workflows. You have: 5+ years of experience in Technical Project Management, Technical Program Management, Technical Account Management , Solutions Architect or similar roles. An advanced English level and great communication skills (oral and written). Passion about the blockchain space and decentralization. You have a technical background and are comfortable with reviewing code at a high-level for estimation purposes and code management tools (GitHub especially). Superb organization and project management skills with the ability to work on and manage multiple complex projects with many stakeholders at the same time. Excellent interpersonal and communication skills and a demonstrated ability to communicate with clients on both technical and non-technical topics. Advanced knowledge of project management tools and familiar with Notion, Linear and GitHub. Demonstrated experience working with professional services scheduling software. Nice to have: Technical experience with blockchain technologies, Solidity, or cybersecurity. Project management certification (PMP, Scrum Master, etc). Advanced knowledge of GitHub. PMO or other people management experience. Logistics: All positions at OpenZeppelin are 100% remote, however you must be located/able to work in the Americas or European time zones to be considered for this position. Our interview process takes place on Zoom and tends to consist of the following stages: Recruiter Call (45mins) Hiring Manager Call (45mins) PM Team Interview 60mins) Leadership Interview (30mins) Paid work test (Lasting up to 10 days) Reference checks Benefits Company in-person gatherings in different locations around the world 😎 Fully remote work 🌎 Flexible time off 🏝 Paid parental leave for primary or second caregiver 💙 One time work-from-home equipment stipend of up to $500 USD 🪑 Co-working (up to $250/month) 👩‍💻 Medical coverage Annual Learning & Development budget 🧠 Referral program Work with a global team in a fast-growing industry 🚀 At OpenZeppelin, we are an equal opportunity employer and we value different perspectives. We are committed to building a diverse workforce. This includes but is not limited to gender, race, sexual orientation, religion, national origin and other characteristics that make each one of us unique. In this uniqueness, we find the most value. Come join us!  

The Role: We are looking for a Senior iOS Developer for one of our clients. You are a perfect candidate if you are growth-oriented, you love what you do, and you enjoy working on new ideas to develop exciting products. What we’re looking for: Minimum of 5 years of extensive experience with iOS development. Proven experience with Swift for iOS development. Experience with Flutter and React Native for cross-platform development. Strong understanding of iOS development concepts including UIKit and SwiftUI. Familiarity with iOS application architecture patterns, responsive design, and state management. Responsibilities:   Lead the design, development, and maintenance of high-quality iOS applications using Kotlin, Flutter, and React Native. Utilise Flutter and React Native to build efficient and responsive cross-platform mobile applications for iOS devices. Collaborate with UI/UX designers to implement visually appealing and user-friendly interfaces for iOS applications. Conduct thorough code reviews to ensure code quality, consistency, and adherence to best practices. Implement and advocate for automated testing strategies. Identify and  address performance bottlenecks within iOS applications, optimise code and resources for improved efficiency.    What we offer:   Get paid, not played No more unreliable clients. Enjoy on-time monthly payments with flexible withdrawal options. Predictable project hours Enjoy a harmonious work-life balance with consistent 8-hour working days with clients. Flex days, so you can recharge Enjoy up to 24 flex days off per year without losing pay, for full-time positions found through Proxify. Career-accelerating positions at cutting-edge companies Discover exclusive long-term remote positions at the world's most exciting companies. Hand-picked opportunities just for you Skip the typical recruitment roadblocks and biases with personally matched positions. One seamless process, multiple opportunities A one-time contracting process for endless opportunities, with no extra assessments. Compensation Enjoy the same pay, every month with positions landed through Proxify.

The Sui Foundation exists to support the development, growth and adoption of the Sui network. Sui is the first permissionless Layer 1 blockchain designed from the ground up to enable creators and developers to build unique Web3 experiences from gaming to finance. The Sui Foundation is committed to three decentralization principles; Embrace transparency and level the playing field, Communicate openly to build a culture of trust, and Engage directly with the community.Mission:Onboard the next billion users to web3 by supporting the advancement and global adoption of the Sui blockchain.Vision:To create a better world that unlocks opportunities through universal access and individual ownership.The Role:The Developer Relations team engages with the developer community online and in person to provide expert help and guidance in building next-generation Web3 applications on Sui. By talking to the community and understanding developer pain points, the team creates a rapid and positive feedback loop between the developer community and the protocol.As an engineer on the Developer Relations team, you will have or develop a technical understanding of the Sui protocol as well as a proficiency in writing Sui Move. You will have or develop an understanding of the Sui ecosystem by using developer tooling and testing apps. You will use your newly-developed knowledge to collaborate and connect with developers, enabling them to build and innovate on Sui.You will use your excellent communication skills to explain complex concepts to a wide variety of audiences, such as Web2 developers and Solidity developers, and through a variety of mediums, including documentation, tutorials and workshops.As an experienced engineer, you will be able to operate on your initiative, prioritize work streams based on impact, and manage cross-functional teams.This role is an exciting opportunity for someone who enjoys high-impact, complex, and multi-disciplinary programs. Experience of Move (or Rust) is a positive that will enable the role to be picked up quickly, but fast learners are also welcome!Responsibilities:Understand the community's goals, and provide technical expertise and direction to help the developers navigate their journey of building on Sui.Create and own the feedback loop between the community and the network.Translate developer feedback into meaningful product insights for future product development.Develop and deliver remote and in-person training sessions and workshops for new and existing Sui developers.Requirements:Based in APAC.7+ years of Software Engineering or combination of Software and DevRel Engineering experience.Strong written and verbal communication skills.Strong interest in Web3.Good understanding of developer profiles, developer markets and trends within Europe, gained either through developer-facing work experience or personal intuition.Nice to Have:Prior DevRel experience, or related developer-facing function (e.g. Solutions Engineering).Experience with blockchain, cryptography and/or Web3 engineering.Experience with Move and/or Rust programming language(s).Our team is 100% remote and we are hiring across the world. Here at the Sui Foundation, you’ll be joining a world-class team with tremendous growth potential as we bring the next billion users to web3.

About us Founded in 2015 with the mission to protect the open economy, OpenZeppelin is the world leader in securing blockchain applications and smart contracts.  Its bedrock open source Contract Libraries are a public good and industry standard for smart contract development. OpenZeppelin’s professional expertise, unified with the Defender developer security platform, integrates through clients’ development lifecycles, so teams can plan, code, audit, deploy and operate projects faster and more safely. Please note: Always refer to OpenZeppelin's official job page for the most accurate information about our open roles, as we have seen multiple third party job sites posting inaccurate information. The ZK Practice The Zero-Knowledge Practice at OpenZeppelin is responsible for the execution and delivery of cryptography audits and circuit audits for the world’s leading web3 organizations and protocols. The team currently consists of security researchers, applied cryptographers and theoretical cryptographers who perform audits and advisory with direct client contact and conduct independent zk-research that culminates in academic publications, blog posts and conference talks. We are now looking to expand this team by one additional applied cryptographer to increase the overall capacity and expand the diversity of academic backgrounds. What you'll be doing Analyzing the security of circuit construction and cryptographic components in support of audits of succinct and/or zero-knowledge proofs for blockchain protocols. Researching new mathematical approaches based on novel cryptography research available in academia. Teaming up with other auditors to review zero-knowledge circuits line by line to try to hack them. Educating the community about zero-knowledge technology and relevant security considerations through series of blog posts. Leading research and contributing to OpenZeppelin’s projects and knowledge bases. Training new team members in zero-knowledge technology. Speaking at ZK conferences around the world. You have PhD or equivalent experience in cryptography, computer science, mathematics, engineering, or related field. In depth algorithmical and mathematical understanding of zero-knowledge proof systems and related cryptographic primitives. Experience implementing cryptographic components in one or more of: Rust, Go/Golang, Solidity, Circom, ZoKrates, Cairo. Proven track record of achieving significant results as demonstrated by grants, fellowships, patents. Publications at leading workshops or conferences at any of the IACR flagship conferences (EUROCRYPT, CRYPTO, ASIACRYPT, etc.). Intellectual curiosity and the capability to learn complex topics independently. An advanced English level and great communication skills (oral and written). The ability to work independently, with minimal supervision. Passion about the blockchain space and decentralization. Ability to work collaboratively in a distributed team. Nice to have Experience analyzing the security of blockchain protocols. Experience building or analyzing STARK-based and/or FRI-based systems. Experience contributing to a major zk library (e.g. Halo2). In-depth knowledge of implementations of elliptic curve cryptography. Experience developing applications using PLONK or recursive zk-proofs. Experience working with L2 scaling protocols or privacy applications Experience participating in zk-themed CTF competitions. Logistics Our interview process takes place on Zoom and tends to consist of the following stages: Recruiter call (45 minutes) Hiring Manager call (1 hour) Team member interview (1 hour) Paid work test (Lasting multiple days) Reference checks Please let us know if you require any accommodations for the interview process, and we’ll do our best to provide assistance. Benefits Company in-person gatherings in different locations around the world 😎 Fully remote work 🌎 Flexible time off 🏝 Paid parental leave for primary or second caregiver 💙 One time work-from-home equipment stipend of up to $500 USD 🪑 Co-working (up to $250/month) 👩‍💻 Medical coverage Annual Learning & Development budget 🧠 Referral program Work with a global team in a fast-growing industry 🚀 At OpenZeppelin, we are an equal opportunity employer and we value different perspectives. We are committed to building a diverse workforce. This includes but is not limited to gender, race, sexual orientation, religion, national origin and other characteristics that make each one of us unique. In this uniqueness, we find the most value. Come join us!