Fountain DAO - Join Our Visionary Remote Team
Status
Full time
Remote
2,500
-
8,333.33
Monthly
30,000
-
100,000
Annual
Payment in Crypto
Role
Full-Stack Engineer
Work Experience
More than 3 years
Description
Fountain DAO - Join Our Visionary Remote Team
About Us: Fountain DAO is an innovative blockchain company with a mission to revolutionize decentralized finance (DeFi). We are building a decentralized exchange (DEX), an on-chain bridge, a transparent lottery system, a pyramid system, and exploring zero-knowledge transfers in the future. Our company operates remotely, embracing the flexibility and diversity that come with a global team.
Why Work with Us? We offer a unique opportunity for our team members to share in the success of Fountain DAO through equity participation. Working with us means being at the forefront of blockchain technology and DeFi solutions, with the flexibility to work from anywhere in the world. You will engage with forward-thinkers and blockchain enthusiasts in a collaborative environment that fosters career growth as the company expands.
Budget and Compensation: We are committed to growing our team and providing competitive compensation as our project evolves. Initially, our budget is limited due to the early stages of development. In the first month, we have allocated a budget of $30K to cover essential roles, including blockchain developers, full-stack developers, and project management. By the second month, the budget will increase to $50K, allowing us to bring on additional talent, such as frontend and backend developers. By the third month, the budget will reach $100K, enabling us to further expand the team with roles such as security experts and smart contract developers. After six months, we anticipate securing additional funding, which will provide us with a more substantial budget to offer competitive salaries to both junior and senior developers.
Open Positions:
1. Blockchain Developer
- Responsibilities:
- Develop and maintain blockchain-based applications.
- Design and implement smart contracts.
- Collaborate with the team to integrate blockchain solutions with our platforms.
- Requirements:
- Proven experience with blockchain protocols (e.g., Ethereum, Binance Smart Chain).
- Proficiency in Solidity or other smart contract languages.
- Understanding of cryptographic principles and decentralized networks.
- Strong problem-solving skills and attention to detail.
- Budget Allocation: Initial compensation will be aligned with our first-month budget of $30K, with potential increases as our funding grows.
2. Full Stack Developer
- Responsibilities:
- Develop and maintain web applications from frontend to backend.
- Collaborate with designers and developers to create seamless user experiences.
- Ensure responsiveness and cross-platform compatibility.
- Requirements:
- Proficiency in frontend technologies (HTML, CSS, JavaScript, React).
- Strong backend skills (Node.js, Express, databases like MongoDB or PostgreSQL).
- Experience with RESTful APIs and microservices architecture.
- Familiarity with version control (Git).
- Budget Allocation: Initial compensation will be part of the $30K first-month budget, with incremental raises in the following months.
3. Project Manager
- Responsibilities:
- Plan, execute, and oversee projects to ensure timely delivery.
- Manage remote teams and facilitate communication.
- Monitor project progress and adjust plans as necessary.
- Requirements:
- Proven experience in project management.
- Excellent organizational and leadership skills.
- Strong communication skills and the ability to manage remote teams.
- Familiarity with project management tools (e.g., Jira, Trello).
- Budget Allocation: Included in the initial $30K budget, with potential for an increased role and compensation as the project scales.
4. Frontend Developer
- Responsibilities:
- Develop user interfaces with a focus on performance and usability.
- Collaborate with UX/UI designers to implement design mockups.
- Optimize applications for maximum speed and scalability.
- Requirements:
- Expertise in HTML, CSS, JavaScript, and modern frontend frameworks (e.g., React, Vue.js).
- Experience with responsive and user-friendly design.
- Familiarity with version control systems (Git).
- Strong problem-solving skills.
- Budget Allocation: Compensation to be included in the second-month budget increase to $50K.
5. Backend Developer
- Responsibilities:
- Develop and maintain server-side logic.
- Integrate user-facing elements developed by frontend developers.
- Optimize the application for maximum speed and scalability.
- Requirements:
- Proficiency in server-side languages (e.g., Node.js, Python, Java).
- Experience with databases (SQL and NoSQL).
- Strong understanding of APIs and microservices architecture.
- Familiarity with cloud services (e.g., AWS, Azure).
- Budget Allocation: Also part of the second-month budget of $50K.
6. Smart Contract Developer
- Responsibilities:
- Write, test, and deploy smart contracts.
- Ensure the security and efficiency of smart contracts.
- Collaborate with the blockchain team to integrate smart contracts into the platform.
- Requirements:
- Experience with smart contract development on Ethereum or other blockchains.
- Proficiency in Solidity or other smart contract languages.
- Understanding of blockchain security best practices.
- Strong analytical and problem-solving skills.
- Budget Allocation: This role will be prioritized in the third-month budget of $100K as the project matures.
7. Security Expert
- Responsibilities:
- Conduct security audits of blockchain applications and smart contracts.
- Implement robust security measures to protect the platform.
- Stay updated on the latest security threats and vulnerabilities.
- Requirements:
- Proven experience in blockchain security.
- Ability to conduct vulnerability assessments and penetration testing.
- Strong understanding of cryptographic principles.
- Excellent analytical skills and attention to detail.
- Budget Allocation: Part of the third-month budget, with a focus on ensuring the security of our growing platform.
Additional Roles: As Fountain DAO grows, we anticipate needing additional roles such as DevOps Engineers to manage our infrastructure, UX/UI Designers to enhance user experience, and Community Managers to engage with our growing user base. These roles will be considered as we secure further funding and expand our operations.
How to Apply: If you are excited about the future of blockchain and want to be part of a dynamic and forward-thinking team, we would love to hear from you. Please send your resume, a cover letter, and any relevant portfolio or project links.
Join Us in Shaping the Future of DeFi!
Skills Required
James Samczsun
Website
Not specified
Country
Not specified
Description
Not specified
Status
Bitrefill
Senior Data Scientist / ML Engineer – Crypto Payments & Lightning Network
Stockholm, Sweden
Stockholm, Sweden
Full time
Remote
About Bitrefill
Bitrefill is the world's leading crypto lifestyle platform. We enable millions of users globally to pay for gift cards, mobile phone refills, and everyday goods using Bitcoin, Lightning Network, and other digital assets. Our long-term goal is to provide everyone with the tools to use crypto as real "digital money" daily — without needing to register for additional services or log into a web platform.
We are now actively building a new product: the Bitrefill crypto card for paying for goods and services in everyday life.
The Role
We are looking for a Senior DS/ML Engineer to help us make data-driven decisions across fraud detection, Lightning Network liquidity optimization, user behavior modeling, and risk scoring for the crypto card.
You won't just build models — you'll help shape the ML infrastructure of a fast-growing crypto-payments startup.
What You'll Do
Fraud & Risk ML — Develop anomaly detection models, transaction scoring for withdrawals, and real-time predictive rules to flag suspicious activity.
Lightning Network optimization — Build models to optimize payment routing, channel liquidity management, and predict channel health.
Crypto card infrastructure — Create credit risk models and user scoring for card issuance without traditional credit history.
LTV & churn prediction — Forecast user behavior to improve retention and conversion, especially in low-crypto-adoption countries.
Product & growth analytics — Develop ML-driven hypotheses for A/B testing and recommendation systems (e.g., which gift cards to offer).
Data pipeline & MLOps — Help build pipelines for training and deploying models to production (alongside engineers).
Requirements
5+ years of experience in Data Science / Machine Learning, ideally in fintech, payments, crypto, or high-throughput transactional systems.
Strong experience building anti-fraud models, time series forecasting (for transactions), LTV predictions, or classification/clustering models.
Python — solid proficiency (pandas, scikit-learn, xgboost/lightgbm; PyTorch/TensorFlow is a plus).
SQL — advanced level.
Experience with Airflow, dbt, or similar ETL/ML pipeline tools.
Understanding of Lightning Network basics (or strong willingness to dive deep within 1–2 weeks).
English — sufficient to discuss ML metrics and business problems fluently.
Big Pluses
Experience with graph models (Node2Vec, GNNs) for transaction chain detection.
Familiarity with blockchain analytics (on-chain data, addresses, transactions).
Experience in credit scoring without traditional credit history.
MLOps skills (Docker, Kubeflow, MLflow, or at least deploying models via FastAPI).
Personal experience using Bitrefill or crypto as a payment tool.
We Offer
Fully remote work from anywhere in the world (with ~4–6 hours overlap with Stockholm time zone).
Opportunity to build an ML system from scratch in a startup that is truly changing how people use crypto.
Competitive salary + equity (tokens) or profit-sharing.
Minimal bureaucracy — maximum responsibility and freedom.
Work with cutting-edge technologies: Lightning Network and crypto cards.
How to Apply
Send your resume and a link to your GitHub / Kaggle / project where you solved a fraud, time series, or risk modeling problem. Mention if you have experience with Lightning or blockchain analytics — if not, just tell us how quickly you can learn new domains.
Bitrefill is the world's leading crypto lifestyle platform. We enable millions of users globally to pay for gift cards, mobile phone refills, and everyday goods using Bitcoin, Lightning Network, and other digital assets. Our long-term goal is to provide everyone with the tools to use crypto as real "digital money" daily — without needing to register for additional services or log into a web platform.
We are now actively building a new product: the Bitrefill crypto card for paying for goods and services in everyday life.
The Role
We are looking for a Senior DS/ML Engineer to help us make data-driven decisions across fraud detection, Lightning Network liquidity optimization, user behavior modeling, and risk scoring for the crypto card.
You won't just build models — you'll help shape the ML infrastructure of a fast-growing crypto-payments startup.
What You'll Do
Fraud & Risk ML — Develop anomaly detection models, transaction scoring for withdrawals, and real-time predictive rules to flag suspicious activity.
Lightning Network optimization — Build models to optimize payment routing, channel liquidity management, and predict channel health.
Crypto card infrastructure — Create credit risk models and user scoring for card issuance without traditional credit history.
LTV & churn prediction — Forecast user behavior to improve retention and conversion, especially in low-crypto-adoption countries.
Product & growth analytics — Develop ML-driven hypotheses for A/B testing and recommendation systems (e.g., which gift cards to offer).
Data pipeline & MLOps — Help build pipelines for training and deploying models to production (alongside engineers).
Requirements
5+ years of experience in Data Science / Machine Learning, ideally in fintech, payments, crypto, or high-throughput transactional systems.
Strong experience building anti-fraud models, time series forecasting (for transactions), LTV predictions, or classification/clustering models.
Python — solid proficiency (pandas, scikit-learn, xgboost/lightgbm; PyTorch/TensorFlow is a plus).
SQL — advanced level.
Experience with Airflow, dbt, or similar ETL/ML pipeline tools.
Understanding of Lightning Network basics (or strong willingness to dive deep within 1–2 weeks).
English — sufficient to discuss ML metrics and business problems fluently.
Big Pluses
Experience with graph models (Node2Vec, GNNs) for transaction chain detection.
Familiarity with blockchain analytics (on-chain data, addresses, transactions).
Experience in credit scoring without traditional credit history.
MLOps skills (Docker, Kubeflow, MLflow, or at least deploying models via FastAPI).
Personal experience using Bitrefill or crypto as a payment tool.
We Offer
Fully remote work from anywhere in the world (with ~4–6 hours overlap with Stockholm time zone).
Opportunity to build an ML system from scratch in a startup that is truly changing how people use crypto.
Competitive salary + equity (tokens) or profit-sharing.
Minimal bureaucracy — maximum responsibility and freedom.
Work with cutting-edge technologies: Lightning Network and crypto cards.
How to Apply
Send your resume and a link to your GitHub / Kaggle / project where you solved a fraud, time series, or risk modeling problem. Mention if you have experience with Lightning or blockchain analytics — if not, just tell us how quickly you can learn new domains.
Payment in Crypto
Keras Labs
Senior Software Engineer
Full time
Remote
Role OverviewKeras Labs is seeking a high-performing Blockchain Engineer to design, build, and scale smart contract systems for a hybrid AMM + perpetual trading platform powered by AI agents.This role also includes building and deploying standard token contracts (ERC20/BEP20) and supporting core on-chain infrastructure in a fast-paced, product-driven environment. Core ResponsibilitiesBuild and maintain smart contracts (Solidity / Rust)Develop and deploy ERC20 / BEP20 (or equivalent EVM) tokensImplement token logic (minting, burning, access control)Build core protocol modules (liquidity, trading, vaults)Integrate price oracles and on-chain data sourcesOptimize contracts for gas efficiency and performanceCollaborate with frontend, product, and research teamsSupport testing, audits, and deployment workflowsMonitor protocol performance and on-chain activity RequirementsStrong proficiency in Solidity (EVM) and/or RustExperience deploying ERC20 / BEP20 or similar token standardsFamiliarity with smart contract testing (Foundry, Hardhat)Understanding of contract security best practicesStrong system design and problem-solving skillsComfortable working in a fast-paced, remote environment Nice to HaveExperience with DeFi protocols (DEX, perps, lending)Understanding of AMM models and perpetual mechanicsExperience building trading systems or financial primitivesExperience with oracles (Chainlink, Pyth, etc.)Exposure to AI agents or automated trading systemsOpen-source contributions in Web3 / DeFi Compensation & BenefitsPerformance Bonus: Annual incentive structureBenefits: Remote-first flexibility, high ownership, impact-driven culture
Payment in Crypto
SADR B
Senior Full-Stack Developer (Web & APK) - Partnership Role
Remote, USA
Remote, USA
Full time
Remote
Title: Lead Web & Mobile Partner for Private Agency
About the Role:
I am Sadr B, founder of a private development agency. I am currently building a dedicated team of elite developers to handle high-value web and mobile (APK) projects. I am not just looking for a freelancer; I am seeking a long-term partner to grow this agency with me.
The Partnership Structure:
Team Spirit: We work as a unified team. You handle the technical execution (Web/App), and I manage agency growth, strategy, and client relations.
Negotiated Rates: We do not post fixed budgets upfront. Every project is discussed in DM based on the specific client quote and requirements.
50/50 Milestone Payment: Security is our priority. Once the client pays the initial deposit, 50% of your fee is funded into LaborX Escrow immediately. The final 50% is released upon delivery and client approval.
Payment: All transactions are handled in Crypto (USDT/Polygon) for speed and transparency.
Requirements:
Expertise in Full-Stack development (React, Node.js, Flutter preferred).
Strong experience in delivering high-quality Android APKs.
A portfolio demonstrating your ability to handle professional-grade projects.
How to Apply:
Please DM me with your portfolio and a brief introduction of your experience. Let’s discuss how we can build this agency together.
About the Role:
I am Sadr B, founder of a private development agency. I am currently building a dedicated team of elite developers to handle high-value web and mobile (APK) projects. I am not just looking for a freelancer; I am seeking a long-term partner to grow this agency with me.
The Partnership Structure:
Team Spirit: We work as a unified team. You handle the technical execution (Web/App), and I manage agency growth, strategy, and client relations.
Negotiated Rates: We do not post fixed budgets upfront. Every project is discussed in DM based on the specific client quote and requirements.
50/50 Milestone Payment: Security is our priority. Once the client pays the initial deposit, 50% of your fee is funded into LaborX Escrow immediately. The final 50% is released upon delivery and client approval.
Payment: All transactions are handled in Crypto (USDT/Polygon) for speed and transparency.
Requirements:
Expertise in Full-Stack development (React, Node.js, Flutter preferred).
Strong experience in delivering high-quality Android APKs.
A portfolio demonstrating your ability to handle professional-grade projects.
How to Apply:
Please DM me with your portfolio and a brief introduction of your experience. Let’s discuss how we can build this agency together.
Payment in Crypto
Worklo
Looking for a Full Stack and Blockchain Developer
Full time
Remote
Worklo is building the future of professional services automation — combining our core PSA platform with a blockchain-powered salary distribution system that automates compensation directly from project data, time entries, role assignments, and milestones. This role is for a highly capable engineer who can own both traditional full-stack SaaS development and blockchain infrastructure, designing and scaling an end-to-end system that bridges Worklo’s platform with secure on-chain payroll execution.You’ll be one of the core engineers shaping both Worklo PSA and our blockchain payroll architecture. This is a greenfield, high-ownership opportunity where you’ll make major architectural decisions across smart contracts, backend systems, frontend applications, database security, and blockchain integrations.ResponsibilitiesFull Stack Platform DevelopmentOwn full product features end-to-end: database schema design, backend API development, frontend UI implementation, deployment, and monitoringBuild and maintain scalable applications using Next.js 15 (App Router, React Server Components), TypeScript, Express.js REST APIs, and SupabaseDesign and implement PostgreSQL schemas, optimize queries, and maintain database performanceWrite and maintain Supabase Row Level Security (RLS) policies for secure multi-tenant data isolationBuild polished, reusable UI components using React, shadcn/ui, and Tailwind CSS 4Develop secure REST APIs with proper validation (Zod), authentication, and error handlingIntegrate third-party services including SMTP, file storage, analytics dashboards, and workflow toolsDebug production issues, improve observability, and contribute to architecture decisionsBlockchain System DevelopmentDesign and implement Solidity smart contracts for salary calculation and automated payroll distributionBuild compensation logic covering:Hours workedRole multipliersMilestone bonusesStablecoin payouts (USDC/USDT)Deploy and manage smart contracts on Polygon L2 or similar EVM-compatible networksDevelop backend blockchain integrations that sync Worklo’s Supabase data with on-chain payroll systemsBuild wallet registry systems enabling MetaMask and WalletConnect integrationImplement blockchain event listeners, webhooks, and indexing systems to synchronize off-chain and on-chain statesCreate secure transaction signing, key management, and server-side blockchain interaction layersBuild in-app dashboards for payroll visibility, wallet management, and transaction historyWrite and maintain comprehensive test suites for smart contracts using Hardhat, Foundry, or similar frameworksOptimize contracts for gas efficiency, security, and upgradeabilityRequirements3+ years of professional experience in full-stack software development3+ years of blockchain development with production-deployed smart contractsStrong TypeScript/Node.js expertise across frontend and backend systemsStrong Solidity skills, including:Reentrancy protectionAccess controlUpgradeability patternsGas optimizationDeep experience with React and modern frontend architectureSolid understanding of PostgreSQL, database design, indexing, and optimizationExperience with Supabase, Firebase, or similar backend platformsExperience designing secure REST APIs and authentication systemsFamiliarity with ethers.js, viem, or similar blockchain interaction librariesExperience with Polygon or other EVM-compatible L2 ecosystemsStrong understanding of ERC-20 standards, stablecoin mechanics, and wallet integrationsAbility to work independently in a remote-first, async environmentComfortable making technical decisions with real product ownershipNice to HaveExperience with Next.js App Router and React Server ComponentsHardhat, Foundry, Truffle, or OpenZeppelin expertiseDeFi protocol or on-chain financial system experienceFamiliarity with The Graph or blockchain indexing infrastructureMulti-sig wallet and treasury management experienceExperience building multi-tenant SaaS productsFamiliarity with advanced frontend libraries such as:@xyflow/react@dnd-kitJotaiSWROpen source contributions or demonstrable side projectsWhy Join Worklo?Greenfield opportunity with major technical ownershipBuild cutting-edge infrastructure combining SaaS + blockchainInfluence architecture from database to smart contractsWork on products used by real agencies and consultanciesRemote-first, async team with strong engineering autonomyImmediate product impact with room to shape long-term systemsIf you’re excited about building scalable SaaS platforms while architecting real-world blockchain payroll systems, this is a rare chance to work at the intersection of enterprise software and decentralized finance.
Payment in Crypto
Michael Har
Junior / Middle Metaverse Developer (Unity / Web3 / VR)
Manzhouli, China
Manzhouli, China
Full time
Remote
We are looking for a Metaverse Developer to help build interactive virtual environments and immersive digital experiences. The role involves developing 3D worlds, integrating Web3 technologies, and working with modern tools for real-time applications.
You will work with Unity, WebGL, and blockchain technologies to create engaging metaverse features and optimize them for performance across different devices. The developer will collaborate with designers and backend engineers to deliver scalable and stable products.
Requirements include experience with Unity and C#, understanding of 3D development, Web3 or blockchain basics, and familiarity with Git and API integration. Experience with VR/AR, NFTs, or multiplayer systems is a plus.
We offer remote work, flexible hours, crypto payments, and the opportunity to build innovative metaverse products.
You will work with Unity, WebGL, and blockchain technologies to create engaging metaverse features and optimize them for performance across different devices. The developer will collaborate with designers and backend engineers to deliver scalable and stable products.
Requirements include experience with Unity and C#, understanding of 3D development, Web3 or blockchain basics, and familiarity with Git and API integration. Experience with VR/AR, NFTs, or multiplayer systems is a plus.
We offer remote work, flexible hours, crypto payments, and the opportunity to build innovative metaverse products.
Payment in Crypto