Senior Full Stack Enablement Engineer
About Us:
Our mission is to make Web3 accessible and user-friendly, harnessing the collaborative power of communities. At ConsenSys, we're leading the charge in reshaping society for the better. We firmly believe that blockchain is the future, capable of laying the groundwork for a fairer and more equitable world.
Blockchain technology is relatively young, with just over a decade of history. Ethereum, one of our key platforms, is still in its early stages. We have a long way to go before reaching our full potential. As a Senior Full Stack Enablement Engineer, you'll be involved in developing the tools, infrastructure, and applications that will scale these platforms to serve billions of users.
Working with us means you'll continually encounter new concepts, ideas, and frameworks from your colleagues, pushing you to excel. You'll become part of a network of entrepreneurs and technologists deeply embedded in our ecosystem. Many ConsenSys alumni have gone on to become tech entrepreneurs, CEOs, and team leaders at other tech companies.
About Customer Success:
Our Customer Success team is all about making our customers successful. We're on the lookout for individuals who approach customers seeking help with innovative and creative solutions. If you're passionate about engaging constructively with customers and want to shape the future of Blockchain production operations, we want to hear from you.
About the Customer Enablement Team:
The Customer Enablement Team's mission is to empower Builders, Customers, and Partners to make the most of our product suite, which includes MetaMask, Infura, Linea, and CNFT. As part of our team, you'll play a pivotal role in:
- Ensuring a seamless onboarding experience for our products.
- Conducting comprehensive training sessions to enhance Builders' expertise and demystify the complexities of web3 development.
- Providing top-notch technical enablement, from in-depth code and infrastructure reviews to hands-on technical workshops and peer programming sessions.
If you thrive in a fast-paced environment where being self-directed, determined, and resilient is the norm, we invite you to join us. To explore our products and solutions, visit consensys.io!
What You'll Do:
As a Senior Full Stack Enablement Engineer, you'll join an elite technical team with expertise in developing and delivering advanced decentralized applications (Ðapps). Most of our team members excel in at least one ConsenSys product and possess deep expertise in areas such as Solidity development or backend development in Node.js/TypeScript. You'll work closely with ecosystem Builders who want to use ConsenSys products, engaging with them through our three main Enablement streams: Onboarding, Training, and Technical Enablement.
Enabling Builders to use our products may involve building alongside them. You'll collaborate in small technical Agile teams to deliver enhancements that improve their development experience, encouraging them to advocate for our products.
As you gain more experience, you'll play a greater role in enforcing best practices and training and coaching the team. Over time, you'll become a trusted expert on one or more ConsenSys products, serving as a valuable resource for ConsenSys teams worldwide.
Who We're Looking For:
- 5+ years of experience as a Software Engineer.
- Strong knowledge of Blockchain technology and the Ethereum ecosystem.
- Hands-on experience in Web3 application development.
- Mastery in one of the following disciplines:
- Back-end development: TypeScript/Node.js (Nest.js framework preferred).
- Blockchain/smart contract development: Solidity/Ethereum, Web3.js, or Ethers.js library.
- Experience with PostgreSQL or MongoDB.
- Familiarity with CI/CD and DevOps best practices.
- Experience working on agile software development projects.
- Ability to engage with customers at a technical and non-technical level in a client-facing environment.
Bonus Points:
- BSc/MSc in Computer Science or related field.
- General interest in DevOps topics or experience with Docker and/or Kubernetes.
- General interest in QA or knowledge of testing frameworks and best practices.
- Experience in deploying blockchain infrastructure.
- User or keen interest in ConsenSys products.
Other Skills to Demonstrate:
- Excellent verbal and written communication in English.
- Teamwork, flexibility, initiative, communication, and organization.
- A commitment to continuous learning and improvement, pushing yourself to stay at the top of your game.
- Willingness to share your knowledge and expertise both internally and externally.
Don't Meet All the Requirements? No Problem!
We value diversity and encourage you to apply if you believe you have what it takes to thrive in our dynamic, remote-friendly startup environment. Share your relevant transferable skills in your cover letter; we're open to challenging our thinking about who fits this role.
ConsenSys is an equal opportunity employer. We welcome applications from people of all backgrounds. We are committed to making our technology accessible to everyone. Employment decisions are made without regard to race, color, national origin, ancestry, sex, gender, gender identity or expression, sexual orientation, age, genetic information, religion, disability, medical condition, pregnancy, marital status, family status, veteran status, or any other characteristic protected by law.
For your protection, please review our best practices guide to avoid fraudulent recruitment practices: Best Practices to Avoid Recruitment Fraud.
The salary range for US-based candidates (excluding bonus, equity, or other benefits) will be determined during the interview process, based on experience and skills, with a range of $118,000 to $237,000 USD
Senior Data Scientist / ML Engineer – Crypto Payments & Lightning Network
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.
Senior Software Engineer
Senior Full-Stack Developer (Web & APK) - Partnership Role
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.
Looking for a Full Stack and Blockchain Developer
Junior / Middle Metaverse Developer (Unity / Web3 / VR)
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.