Data Engineer (Middle+/Senior)
Status
London, UK
Full time
Remote
2,500
-
4,166.67
Monthly
30,000
-
50,000
Annual
Payment in Crypto
Role
Data Engineer
Work Experience
More than 3 years
Description
Are you passionate about blockchain technology and working with data? Do you enjoy taking ideas from early-stage concepts through to useful insights? If so, this could be a fantastic opportunity to be a hands-on engineer shaping the future blockchain data analysis! Now more than ever, we need a team of diverse, passionate and hungry individuals to drive our group vision forward, one block at a time. We need people like YOU, to be a part of our on-chain analysis revolution! As a Data Engineer you will be closely collaborating with both business and backend to design and implement an efficient way of data processing. You will be working in our back end team and will have plenty of opportunities to improve your skills and grow professionally.
Responsibilities: You'll be working on the pipeline of our core product.
This includes:
— Designing and developing blockchain data processing pipelines for new charts, including development and optimizing of the data architecture; — Integrating developments into existing solutions; — Development and maintenance of infrastructure required for optimal extraction, transformation and loading of data from various sources; — Participating in grooming solutions for data processing, ETL/ELT processes and automation of data processing workflows, including coordination with backend developers, DS, DA and QA engineers; — Data validation: counting historical data with BlockSci, automating data validation.
Requirements: — 3+ years of work experience; — Solid knowledge of Python and SQL; — Experience working with Databases (e.g. PostgreSQL, Vertica); — Knowledge of ETL tools (e.g. Spark, Airflow).
Nice to have:
— Experience within the cryptocurrency industry; — Experience with CI / CD (Gitlab CI, Docker, K8s); — Experience with administration of AWS.
Benefits:
— Competitive salary; — Ability to work from our offices in London, or fully remote; — Flexible workday - you choose when you work; — 30 days holiday allowance per year; — Monthly contribution towards your gym membership; — $500 per year towards a personal development fund.
Skills Required
Whalemap
Website
whalemap.ioCompany size
Not specified
Location
United Kingdom
Description
Not specified
Status
Rigel Swiss GmbH
Senior Solidity Engineer
Zürich, Switzerland
Zürich, Switzerland
Full time
Remote
About the Role
We are seeking a Senior Solidity Engineer to design, develop, audit, and optimize high-performance smart contracts on Ethereum and EVM-compatible chains. As a senior contributor, you will lead critical protocol development, mentor junior engineers, and ensure our on-chain systems are secure, gas-efficient, scalable, and production-ready in a fast-moving Web3 environment.
Key Responsibilities
Architect and implement complex smart contracts using Solidity for DeFi protocols, NFTs, governance systems, bridges, oracles, and other blockchain primitives.
Conduct thorough security reviews, formal verification where applicable, and collaborate with external auditors.
Optimize contracts for gas efficiency, security, and maintainability.
Integrate smart contracts with front-end applications, off-chain services, indexing solutions (The Graph, Subsquid), and cross-chain infrastructure.
Develop and maintain comprehensive test suites (unit, integration, fuzzing, and invariant testing).
Participate in code reviews, architectural decisions, and technical roadmap planning.
Mentor mid-level and junior engineers on best practices, security patterns, and Solidity internals.
Monitor deployed contracts, respond to incidents, and implement post-deployment upgrades (via proxies where applicable).
Stay current with EVM upgrades (e.g., Prague/Electra), L2 scaling solutions (Optimism, Arbitrum, zkSync, etc.), and emerging standards (ERC-xxx, Account Abstraction).
Required Qualifications (Must-Have)
1-3 years of professional experience in Solidity development with a proven track record of deploying secure, audited smart contracts to mainnet.
Deep mastery of Solidity (v0.8.x+), including advanced patterns (reentrancy guards, upgradeable proxies – UUPS/Transparent, diamond pattern, libraries).
Strong understanding of EVM internals, gas optimization techniques, and security vulnerabilities (SWC registry, common attack vectors).
Proficiency with smart contract testing frameworks: Foundry (preferred) or Hardhat + ethers.js/waffle.
Experience with formal verification tools (Certora, Slither, MythX) and static analysis.
Solid experience in at least one major Web3 domain: DeFi (AMM, lending, derivatives), NFTs/marketplaces, RWA, or infrastructure (bridges, account abstraction).
Strong TypeScript/JavaScript skills for tooling and integration.
Experience working with Layer 2 solutions and cross-chain messaging protocols.
Excellent written and verbal communication skills; ability to write clear technical documentation (NatSpec, architecture decision records).
Track record of contributing to open-source projects or public GitHub repositories (please share links).
Preferred Qualifications (Strong Plus)
Previous experience at a top-tier Web3 protocol, audit firm (e.g., Trail of Bits, OpenZeppelin), or high-profile DeFi project.
Knowledge of Rust or other languages for blockchain development (bonus for familiarity with zk-proofs or Move).
Experience with Account Abstraction (ERC-4337), intent-based architectures, or MEV mitigation.
Familiarity with governance frameworks (Governor, Tally) and tokenomics design.
Contributions to standards (EIPs) or participation in Ethereum core dev calls.
Security researcher background or history of responsible disclosure.
What We Offer
Competitive compensation (base + significant token equity).
Fully remote-friendly with flexible hours.
Opportunity to work on cutting-edge blockchain infrastructure with real user impact.
Budget for conferences, security tooling, and continuous learning.
Collaborative, high-trust engineering culture.
We are seeking a Senior Solidity Engineer to design, develop, audit, and optimize high-performance smart contracts on Ethereum and EVM-compatible chains. As a senior contributor, you will lead critical protocol development, mentor junior engineers, and ensure our on-chain systems are secure, gas-efficient, scalable, and production-ready in a fast-moving Web3 environment.
Key Responsibilities
Architect and implement complex smart contracts using Solidity for DeFi protocols, NFTs, governance systems, bridges, oracles, and other blockchain primitives.
Conduct thorough security reviews, formal verification where applicable, and collaborate with external auditors.
Optimize contracts for gas efficiency, security, and maintainability.
Integrate smart contracts with front-end applications, off-chain services, indexing solutions (The Graph, Subsquid), and cross-chain infrastructure.
Develop and maintain comprehensive test suites (unit, integration, fuzzing, and invariant testing).
Participate in code reviews, architectural decisions, and technical roadmap planning.
Mentor mid-level and junior engineers on best practices, security patterns, and Solidity internals.
Monitor deployed contracts, respond to incidents, and implement post-deployment upgrades (via proxies where applicable).
Stay current with EVM upgrades (e.g., Prague/Electra), L2 scaling solutions (Optimism, Arbitrum, zkSync, etc.), and emerging standards (ERC-xxx, Account Abstraction).
Required Qualifications (Must-Have)
1-3 years of professional experience in Solidity development with a proven track record of deploying secure, audited smart contracts to mainnet.
Deep mastery of Solidity (v0.8.x+), including advanced patterns (reentrancy guards, upgradeable proxies – UUPS/Transparent, diamond pattern, libraries).
Strong understanding of EVM internals, gas optimization techniques, and security vulnerabilities (SWC registry, common attack vectors).
Proficiency with smart contract testing frameworks: Foundry (preferred) or Hardhat + ethers.js/waffle.
Experience with formal verification tools (Certora, Slither, MythX) and static analysis.
Solid experience in at least one major Web3 domain: DeFi (AMM, lending, derivatives), NFTs/marketplaces, RWA, or infrastructure (bridges, account abstraction).
Strong TypeScript/JavaScript skills for tooling and integration.
Experience working with Layer 2 solutions and cross-chain messaging protocols.
Excellent written and verbal communication skills; ability to write clear technical documentation (NatSpec, architecture decision records).
Track record of contributing to open-source projects or public GitHub repositories (please share links).
Preferred Qualifications (Strong Plus)
Previous experience at a top-tier Web3 protocol, audit firm (e.g., Trail of Bits, OpenZeppelin), or high-profile DeFi project.
Knowledge of Rust or other languages for blockchain development (bonus for familiarity with zk-proofs or Move).
Experience with Account Abstraction (ERC-4337), intent-based architectures, or MEV mitigation.
Familiarity with governance frameworks (Governor, Tally) and tokenomics design.
Contributions to standards (EIPs) or participation in Ethereum core dev calls.
Security researcher background or history of responsible disclosure.
What We Offer
Competitive compensation (base + significant token equity).
Fully remote-friendly with flexible hours.
Opportunity to work on cutting-edge blockchain infrastructure with real user impact.
Budget for conferences, security tooling, and continuous learning.
Collaborative, high-trust engineering culture.
Payment in Crypto
Klim V
Call Center Operator Needed | US Based Native English
Part time
Remote
Hiring: Native English Call Center Representatives (Remote)
We are looking for confident, communicative individuals with a native-level English accent, preferably American (US), to join our remote call center team.
Requirements:
Native or native-level English speaker (US accent preferred)
Excellent communication and conversation skills
Comfortable speaking on the phone
Reliable internet connection and a quiet working environment
Professional and friendly attitude
Compensation:
Fixed payment of $15 per completed call
Flexible schedule
Remote work
If you have a clear, natural English accent and enjoy talking to people, we'd love to hear from you.
To apply, send us a short voice recording introducing yourself along with your contact information.
We are looking for confident, communicative individuals with a native-level English accent, preferably American (US), to join our remote call center team.
Requirements:
Native or native-level English speaker (US accent preferred)
Excellent communication and conversation skills
Comfortable speaking on the phone
Reliable internet connection and a quiet working environment
Professional and friendly attitude
Compensation:
Fixed payment of $15 per completed call
Flexible schedule
Remote work
If you have a clear, natural English accent and enjoy talking to people, we'd love to hear from you.
To apply, send us a short voice recording introducing yourself along with your contact information.
Payment in Crypto
E Moderators
Travaillez à domicile en tant que opérateur de chat
Part time
Remote
Vous cherchez un emploi offrant une flexibilité totale en termes d'horaires et le confort du travail à domicile ?
Avec une rémunération compétitive et garantie, cette opportunité pourrait être parfaite pour vous.
Rejoignez E-Moderators en tant que Modérateur/Modératrice de Chat et profitez du travail à distance selon vos propres conditions.
Votre rôle :
• Surveiller les conversations dans des salons de discussion en ligne afin de garantir un environnement respectueux et accueillant.
• Identifier, gérer et signaler les messages hors sujet ou inappropriés.
Ce que nous offrons :
• Horaires flexibles avec des options à temps partiel et à temps plein.
• Formation gratuite et un soutien continu pour vous aider à réussir.
• Rémunération hebdomadaire compétitive et garantie.
Exigences :
• Maîtrise du français de niveau natif et solide connaissance culturelle de la France, du Canada, et de la Belgique.
• Être en âge légal de travailler.
• Un ordinateur fiable et une connexion Internet stable.
• De solides compétences en communication et un haut niveau d'empathie.
Vous souhaitez rejoindre notre équipe ?
Hannah Bayaras
Growth Hacker
Prague, Czechia +9
Prague, Czechia +9
Full time
Remote
About Us
We are an AI & Blockchain company building the financial infrastructure for the AI age. We have customers in 19 countries, and our team is an international mix of remote talents with two core locations in Singapore and Dubai.
We raised $2.8M in funding and are expanding our team, with new products across SaaS and retail. By joining now, you’ll have the unique opportunity to work directly with founders who have made multiple exits, and build the future of AI and finance.
About You
Deeply obsessed with consumer product experiences.
Your favorite source of alpha is Reddit or X.
AI-native with modern growth, creative, and automation tools.
Strong copywriter with a bias toward action and fast execution.
Excited by the intersection of AI, Fintech, and Blockchain, but mature enough to hide complexity from users.
Obsessed with data, analytics, audiences, retargeting, and experimentation.
Has proven wins: campaigns, funnels, content, communities, apps, or growth loops.
Your Work
Run growth experiments across acquisition, activation, retention, and referral.
Write sharp copy for ads, landing pages, onboarding, email, social, and product flows.
Use AI tools like Claude Code, Codex, ChatGPT, automation tools, and creative testing tools daily.
Analyze funnels, cohorts, audiences, retargeting pools, attribution, and behavioral data.
Turn complex crypto and AI ideas into simple consumer-facing value.
Work closely with the product team to improve user experience and grow beyond crypto-native audiences.
We are an AI & Blockchain company building the financial infrastructure for the AI age. We have customers in 19 countries, and our team is an international mix of remote talents with two core locations in Singapore and Dubai.
We raised $2.8M in funding and are expanding our team, with new products across SaaS and retail. By joining now, you’ll have the unique opportunity to work directly with founders who have made multiple exits, and build the future of AI and finance.
About You
Deeply obsessed with consumer product experiences.
Your favorite source of alpha is Reddit or X.
AI-native with modern growth, creative, and automation tools.
Strong copywriter with a bias toward action and fast execution.
Excited by the intersection of AI, Fintech, and Blockchain, but mature enough to hide complexity from users.
Obsessed with data, analytics, audiences, retargeting, and experimentation.
Has proven wins: campaigns, funnels, content, communities, apps, or growth loops.
Your Work
Run growth experiments across acquisition, activation, retention, and referral.
Write sharp copy for ads, landing pages, onboarding, email, social, and product flows.
Use AI tools like Claude Code, Codex, ChatGPT, automation tools, and creative testing tools daily.
Analyze funnels, cohorts, audiences, retargeting pools, attribution, and behavioral data.
Turn complex crypto and AI ideas into simple consumer-facing value.
Work closely with the product team to improve user experience and grow beyond crypto-native audiences.
Hannah Bayaras
AI-Native Full-Stack Product Engineer
Tallinn, Estonia +9
Tallinn, Estonia +9
Full time
Remote
About Us
We are an AI & Blockchain company building the financial infrastructure for the AI age. We have customers in 19 countries, and our team is an international mix of remote talents with two core locations in Singapore and Dubai.
We raised $2.8M in funding and are expanding our team, with new products across SaaS and retail. By joining now, you’ll have the unique opportunity to work directly with founders who have made multiple exits, and build the future of AI and finance.
About You
You are a full-stack product engineer who can turn ideas into products from 0 to 1, using modern agentic coding tools without losing engineering judgment. This is not a simple vibe-coding role. You need to know how to code, reason about systems, identify poor abstractions, avoid AI-generated slop, and ship software that is readable, maintainable, and useful. You should be able to sit with a product idea, identify the core user flow, design the first version, build the front end, wire up the back end, leverage AI tools aggressively, and still have the engineering judgment to know when the code is wrong.
Your Profile
Full-stack engineer with real product taste.
AI-native, but not AI-dependent.
Comfortable shipping across front end, back end, database, infra, and third-party APIs.
Able to use coding agents deeply while maintaining control over architecture and quality.
Good at detecting slop: messy code, fake abstractions, weak tests, security gaps, bad UX, and hidden complexity.
Independent, fast, curious, and comfortable with ambiguity.
Your Work
Build products and tools from scratch.
Use AI coding tools to materially increase shipping speed.
Work across React/Next.js, Node/Python, databases, APIs, authentication, cloud platforms, and similar technologies.
Turn product ideas and UX concepts into useful software with minimal direction.
We are an AI & Blockchain company building the financial infrastructure for the AI age. We have customers in 19 countries, and our team is an international mix of remote talents with two core locations in Singapore and Dubai.
We raised $2.8M in funding and are expanding our team, with new products across SaaS and retail. By joining now, you’ll have the unique opportunity to work directly with founders who have made multiple exits, and build the future of AI and finance.
About You
You are a full-stack product engineer who can turn ideas into products from 0 to 1, using modern agentic coding tools without losing engineering judgment. This is not a simple vibe-coding role. You need to know how to code, reason about systems, identify poor abstractions, avoid AI-generated slop, and ship software that is readable, maintainable, and useful. You should be able to sit with a product idea, identify the core user flow, design the first version, build the front end, wire up the back end, leverage AI tools aggressively, and still have the engineering judgment to know when the code is wrong.
Your Profile
Full-stack engineer with real product taste.
AI-native, but not AI-dependent.
Comfortable shipping across front end, back end, database, infra, and third-party APIs.
Able to use coding agents deeply while maintaining control over architecture and quality.
Good at detecting slop: messy code, fake abstractions, weak tests, security gaps, bad UX, and hidden complexity.
Independent, fast, curious, and comfortable with ambiguity.
Your Work
Build products and tools from scratch.
Use AI coding tools to materially increase shipping speed.
Work across React/Next.js, Node/Python, databases, APIs, authentication, cloud platforms, and similar technologies.
Turn product ideas and UX concepts into useful software with minimal direction.