NodeJS (Node.js)Rejolut is one of the award winning fastest growing emerging tech company which is working on leading technology like Blockchian, ML & AI, Complex mobile & web apps, IoT etc.
The ideal candidate will be responsible for developing highly scalable and secure code.
Responsibilities:-
-Able to take the Extreme Ownership of modules/product/projects
-Able to learn & implement new technology/framework/library/networks at God Speed
-Able to come with optimal solution for the business problem
-Can handle calls with the client & customer to know their feedback
-Writing clean code & able to dig into other's code or open source code
-Brainstorm and help evaluate applications for new tools and technologies as they continually evolve
-Maintain and extend current client- and server-side applications responsible for integration and business logic
Desired Candidate Profile:-
- Setting up and configuring Full node clients for various Blockchains.
- In Depth understanding of atleast two blockchain network like Ethereum, Hedera Hashgraph, Tezos, Hyperledger, BlockApps, Algorand, Corda etc
- Working closely with DevOps to make blockchain infrastructure robust and scalable.
- Designing and writing well-structured APIs in Node.js to connect to Blockchain infrastructure.
- Develop and manage various applications to integrate Blockchain infrastructure into the main product.
- Staying up to date with new developments and news in integrated chains, like forks, main net launches, migration.
- Documenting architecture and guidelines.
- Always being on the lookout to enhance technology, by finding and making new tools, utilities, and libraries.
- Managing and enhancing a cutting edge tech stack, comprising of Node.js, ES2016/17 (Javascript), AWS, MongoDB, SQL
- Cross-team contribution whenever required.
- Familiarity with basic cryptography
- Familiarity with P2P networks
Culture
- Fast-paced, intellectually stimulating, steep learning, and growth
- Close-knit, hardworking, supportive colleagues
- Challenging work
- Flat organization with no hierarchy
- If you like problem solving, and love latest technology, there are very few better places
How we are different
-We are young and dynamic team who are obsessed with solving business problem at scale -We are a technology agnostic company who focus more on finding the optimal solution to business problem rather than technology
Why to join us
-We provide huge learning curve. Spending 1.5-2 years with us will put you 3 years ahead in the career
-We work only on cutting edge technology like React, React Native, Flutter, NodeJS, Python, Go, Svelte, ELM
-There are two technology Co-founder in the company who are pretty much hands-on and have earlier bult the Consumer application which is downloaded millions of time and are in leadership position in copanies like Samsung, Purplle, Loylty Rewardz
-Get mentored by the best in the industry
-Flexible working hours
-Perks best in the industry
Shubham Vishwakarma
Full Stack Developer - Averlon
About Rejolut
About
Rejolut is one of the award winning fastest growing emerging tech company which is working leading technology like Blockchian, ML & AI, Complex mobile & web apps, IoT etc.
We are a team that loves creativity and technology. We create products we are proud of. We fuse innovation with art to achieve Different, Intutive & Quality products.
Our Dogma: We don't make shit.
How we are different
-We are young and dynamic team who are obsessed with solving business problem at scale.
-We are a technology agnostic company who focus more on finding the optimal solution to business problem rather than technology itself.
Why to join us
- We provide huge learning curve. Spending 1.5-2 years with us will put you 3 years ahead in the career.
- We work only on cutting edge technology like React, React Native, Flutter, NodeJS, Python, Go, Svelte, ELM
- There are two technology Co-founder in the company who are pretty much hands-on and have earlier bult the Consumer application which is downloaded millions of time and are in leadership position in companies like Samsung, Purplle, Loylty Rewardz.
- Get mentored by the best in the industry
- Flexible working hours
- Perks best in the industry
- Flat structure, no hierarchy
Culture
- Fast-paced, intellectually stimulating, steep learning, and growth
- Close-knit, hardworking, supportive colleagues
- Challenging work
- Flat organization with no hierarchy
- If you like problem solving, and love latest tehnical innovations, there are very few better places
Company video
Photos
Company social profiles
Similar jobs
**Role Overview:** We are seeking a skilled Web3 blockchain developer with strong experience in Ethereum and decentralized finance (DeFi). The ideal candidate should have expertise in smart contract development, ERC20 tokens, security best practices, and experience integrating with blockchain payment gateways or APIs related to stablecoins.
**Key Responsibilities:**
* Develop and deploy ERC20 smart contracts, including token minting, redemption, and transfer functionalities on Ethereum.
* Design, review, and optimize smart contracts related to crypto lending, escrow, collateral, and repayments.
* Integrate with Circle’s platform for USDC operations, understanding minting and redeeming processes via its APIs.
* Assess stability mechanisms of USDC, ensuring secure handling of minting, redemption workflows, and transactions.
* Collaborate with backend systems (Node.js / Typescript) to facilitate blockchain interactions, manage transactions, and implement error recovery.
* Implement blockchain security best practices, including transaction signing, API key management, and event validation.
* Explore interoperability between Ethereum and other blockchain networks as needed, considering costs and operational efficiency.
* Work closely with frontend and backend teams to embed blockchain transaction logic, wallet management, and transaction tracking.
* Document smart contract code, API workflows, and integration processes to support compliance and audits.
* Ensure platform adherence to relevant regulatory standards for crypto operations.
* Requirements:
* Proven experience in Ethereum smart contract development (Solidity), with a focus on ERC20 standards.
* Experience with DeFi protocols, escrow, lending, or collateral management smart contracts.
* Familiarity with Circle’s platform APIs, especially for USDC minting and redemption workflows, is a strong advantage.
* Hands-on experience with blockchain libraries such as web3.js, ethers.js, or similar.
* Understanding of blockchain transaction costs, network throughput, and interoperability considerations.
* Strong knowledge of smart contract security, auditing, and safe transaction handling.
* Experience working with backend environments like Node.js or Typescript.
* Basic familiarity with Circle’s wallet APIs, webhook integrations, and transaction validation best practices.
* Excellent coding, debugging, and documentation skills.
* Ability to work independently and collaboratively in a dynamic environment.
*
**Preferred Skills:**
* Experience across multiple blockchain ecosystems (e.g., Ethereum, Polygon, Solana).
* Prior exposure to Circle’s API systems and USDC management workflows.
* Strong security awareness around wallet management, API key handling, and transaction validation.
* Knowledge of DeFi security audits, formal verification, or related security frameworks.
* Contributions to open-source blockchain projects or experience in blockchain community engagement.
Be the brain behind a real based tokens project where real liquidity powers P2P trading.
We build next-gen blockchain tokens (ERC20/BEP20/TRC20) that are instantly transferable P2P, divisible, tradable on escrow systems, and backed by real liquidity.
Who We’re Looking For:
IIT graduates preferred with strong Blockchain + DeFi expertise
Solidity + Web3.js / Ethers.js expert
Experienced in tokenomics, stablecoins, AMMs, liquidity pools & P2P escrow
Ability to mint max tokens with minimal liquidity investment while keeping price stable
Key Responsibilities:
Deploy secure ERC20/BEP20/TRC20 tokens
Design liquidity-backed tokenomics
Optimize capital efficiency & AMM strategies
Build P2P escrow smart contracts
Maintain stable token price peg across exchanges
- Proficient in Solidity programming language
- Experience with wallet integrations
- Experience with ethers.js/web3.js
- Experience with Nodejs
- Experience with upgradable contracts, dynamic contracts, and factory contracts
- Design and develop smart contracts and decentralized applications on Ethereum, Polygon and Tron
- Excellent knowledge of various token standards like ERC20, ERC721 and ERC1155
- Write end-to-end unit tests for all smart contracts
- Expertise in Typescript, Nodejs and Golang.
- Prior working experience in Hyperledger 2.x.
- Strong understanding of blockchain, smart contracts, consensus mechanisms and cryptography.
- Proficiency in developing Chain codes/Smart Contracts.
- Experience building front end applications using Angular.
- Proficient in MongoDB.
- Experience with Relation databases like MySQL, MSSQL.
- Write application code, smart contracts, and unit test cases according to the quality guidelines.
- Work across multiple teams, mentor junior developers and actively participate in code reviews.
- Co-ordinate with architects to produce technical designs.
- Skilled in Docker, Kubernetes, Nginx, Git.
- Knowledge of design patterns and best practices.
- Document the development process, architecture, and standard components.
- Awareness of CI/CD pipelines.
RustDesignation - Blockchain developers
Work Mode :- Remote
Qualifications and Experience:
- The Blockchain developer will be responsible for designing, developing and implementing blockchain solutions.
- Candidates must be from Bachelor of Engineering Background.Freshers do not apply
- Minimum 3-5 years of hands on Experience in Blockchain,solidity,RUST,IDO and Token launches is mandatory.
- We are looking Candidates should who can join us immediately or 15 days
C++
Java
JavascriptAs a Blockchain Developer at Cere Network, you will be responsible for designing, implementing, and supporting a distributed blockchain-based network. Your primary responsibility will be analyzing requirements, designing blockchain technology around a certain business model, and the building and launching of a blockchain network.
Responsibilities :
- Research, design, develop, and test cutting edge technologies in blockchain and beyond (real-time event sourcing, automated orchestrations, distributed big data, ML/AI, etc)
- Brainstorm and help evaluate applications for new tools and technologies as they continually evolve
- Maintain and extend current client- and server-side applications responsible for integration and business logic
- Be involved in the global blockchain community- work on implementing and integrating the latest improvement proposals
- Develop strong written English communication skills by documenting everything, from design to implementation, to process and beyond.
Skills :
- 2-5 years experience
- Strong software development background
- Experience working with large distributed computing deployments with real users
- Experience working with open-source projects
- Proficiency in one of the following languages: C++, Java, JavaScript
- Strong knowledge of common algorithms and data structures
- Familiarity with cryptography concepts
- Experience with Substrate and Rust
- Familiarity with P2P networks and high throughput and robust services
- Strong knowledge of blockchains/consensus protocol
- Strong knowledge of concurrency and writing efficient and safe multithreaded code
- Nice to have knowledge of STL, C++11
Timeswap Labs is building the first fully decentralized money market protocol within the DeFi ecosystem. We are solving one of the hardest problems in DeFi of building trust less & permissionless money markets without using any external Oracle.
Timeswap uses a proprietary AMM for price discovery of interest rates & collateralization ratio without using an external Oracle. Timeswap enables debt financing for long tail assets just like Uniswap enabled equity financing for long tail assets. Timeswap is backed by founders of a multi-billion-dollar crypto protocol, top tier VC funds from Silicon Valley & Singapore and by prominent Angel Investors in the web 3.0 ecosystem.
Role: Senior Smart Contract Developer (Full Time)
We are hiring a full time Senior Smart Contract developer with demonstrated experience in deploying smart contracts on Ethereum mainnet and other EVM compatible blockchains. The developer will work closely with our Founder and other smart contract engineers in the team.
Must Have:
• Minimum 3-4 yrs full time work experience in developing & deploying smart contracts in a verified Decentralised protocol
• Minimum 3-4 years experience on working with NodeJS
• Verifiable previous experience deploying smart contracts on Ethereum mainnet with code references
• Strong experience with the EVM and writing high-quality, well-tested Solidity code
• Basic understanding of DeFi applications & mechanism design with security first approach
• Familiarity with common smart contract frameworks (e.g. Hardhat / Brownie / OpenZeppelin) and security practises
Good to have:
• Prior experience deploying any DeFi application
• Familiarity with GraphQL
• Familiarity with web3.js / ethers.js / Typescript / ELM / Alchemy or similar RPC Providers
• Familiarity in writing property-based tests for smart contracts
• Developing SDK/Developer utilities
How to Apply:
• Share your CV with previous code references (GitHub)
• Briefly describe your prior experience and how that will help in the aforementioned role .
RustWe are looking for a Blockchain Developer who has around 2-3 years of experience, and has past experience with working on blockchain-based systems and scenarios. The ideal candidate would be someone who understands the concepts of Blockchain technology and having working experience on Rust and Solana.
-
Desire to work in a startup environment, fun@work culture and able to self-manage.
-
In Depth understanding of at-least two blockchain network like Rust, Substrate, Polkadot Solana, Hedera Hashgraph, Tezos, BlockApps, Algorand, Corda, Lambda, Cargo etc
-
Familiarity with basic cryptography to understand the essentials of blockchain systems.
-
Hands on in Rust
-
Designing and writing well-structured APIs in Node.js and MongoDb to connect to Blockchain infrastructure
-
Staying up to date with new developments and news in integrated chains.
-
Past experience with Wallets or Crypto Exchanges would be a major plus.
-
Experience with third-party libraries and APIs.
-
Experience working in an agile development process.
-
Documenting architecture and guidelines.
-
Be proficient in using version control and continuous integration, with tools such as Gitlab, Git and Jenkins.
-
Write clear, maintainable and testable code that you are proud of.
-
Attend training and education where necessary to up-skill themselves.
-
Experience in writing smart contracts for large-scale production blockchain applications.
-
Cross-team contribution whenever required.
-
Familiarity with basic cryptography.
-
Should have a deep understanding of the blockchain and cryptocurrency space and smart contract systems, specifically having a deep understanding of Rust.
Why us?
We at Wow Labz are always striving to look for exciting problems to solve. Whether we’re creating new products or helping a small startup extend its reach, we build from our heart. We’re entrepreneurial and we love new ideas. Fun culture with a team that cares about your development and growth.
What are we looking for?
We are looking for a tech enthusiast working primarily on blockchain technology to be part of the core blockchain team at Wow Labz. You would be a part of the Roadmap team that is working on the architecture, design, development and deployment of our decentralized platform.
It comprises a suite of products to create the next generation data economy. It would not just facilitate, but also incentivize the curation, clean-up / classification and verification of the world’s open data. In the process, it would create value for a wide spectrum of token holders including – data owners, data scientists / data workers, publishers, yield farmers / liquidity providers / market makers, data oracles and data buyers.
Your primary responsibilities would be analyzing requirements, designing blockchain technology around a certain business model and launching a blockchain network.
Please be sure to highlight the following in your resume:
- Publicly accessible links to the projects you have built and deployed. These need to be blockchain based. (MANDATORY)
- List of certifications you have completed on blockchain development (optional).
Responsibilities:
- Participate in the full life cycle of blockchain development, from research and analysis to architecture (security, performance, scalability etc), design and execution (coding, testing, benchmarking, deployment).
- Develop (code hands on) protocols, backend APIs and dApps
- Mentor team members, review code artifacts and provide technical guidance, hands on training
- Manage or oversee the DevOps of blockchain projects
- Publicly speak at tech meetups, organise forum sessions or webinars (we’ll create the opportunities).
- Maintain and extend current client- and server-side applications responsible for integration and business logic
- Stay up to date with the developments in the global blockchain community
- Maintain existing protocols and dApps
- Raise the bar in writing clean, well documented code
- Hire talented developers as a part of the Blockchain team
Required Skills & Experience:
- 2+ years of minimum experience in Blockchain development
- Strong software development background
- Strong knowledge of various blockchain technologies like Ethereum, Polkadot, Solidity, Substrate and related tools (Truffle, geth, etc.)
- Experience with Web3.js, RPC, IPC and web socket connections
- Experience with wallets like Metamask, Mist or Polkawallet
- Strong knowledge of ERC20, ERC777, ERC721
- Understanding of tokenomics, token inflation and similar concepts
- Strong experience implementing utility tokens
- Strong knowledge of common algorithms and data structures
- Familiar with popular consensus mechanisms (POW, POS, NPOS, DPOS, POA, etc)
- Familiar with distributed P2P protocols like bit torrent
- Experience with cryptographic libraries (SHA, TripleDES, RSA, HMAC, MD5, Blowfish, etc)
- Experience with Git
- Highly capable of executing in a fast-paced, virtual, changing environment
Any of this is a BIG PLUS:
- Hands on experience with Rust/ Substrate
- Contribution to open source blockchain projects
Persona of the kind of people who would be a culture fit:
- Curious and aware of the latest digital and social media trends
- Strong relationship-building skills
- Exceptional analytical reasoning, problem-solving, and creative thinking skills
- Extremely self-driven and able to execute in a diligent manner
- Get a kick out of leading a solution towards its completion
- Fun to hang out with!
Deep LearningAbout Mastercard
We are the global technology company behind the world’s fastest payments processing network.
We are a vehicle for commerce, a connection to financial systems for the previously excluded, a technology innovation lab, and the home of Priceless.
We ensure every employee has the opportunity to be a part of something bigger and to change lives.
We believe as our company grows, so should you.
We believe in connecting everyone to endless, priceless possibilities.
Overview Services and Data is helping to shape the future of data insights by leveraging billions of anonymized, aggregated transactions in a 10 petabyte date warehouse to help financial institutions, merchants, media, and governments manage their businesses more effectively.
Advanced Analytics is charged with servicing clients by centralizing and optimizing the world class analytical, modeling, software coding, data sourcing, product development, product management, econometrics, and associated delivery capabilities of the MasterCard Advisors organization.
It focuses on creating innovative technology solutions which leverage technology in the data science, artificial intelligence and analytics arenas; on enabling the field with industrialized, repeatable products and on researching and incubating emerging technology to determine how they might apply to our customers and facilitate positive outcomes.
What we are re looking for
- Are you motivated by developing new Analytical skills, leading to insights into issues and developing recommendations that add real value to clients?
- Have you managed the client independently and effectively?
- Do you want to play a key role in driving a world beyond cash?
- Leading the formulation of artificial intelligence and machine learning solution objectives. Working on technical requirements based on user need.
- Responsible for creating the framework of solutions that take data intensive and complex business challenges and provide easily consumed and automated outcomes
- Using unique visualization techniques, condenses large volumes of complex ideas into elegant and simple visual models
- Determine opportunities to exploit new data sources or leverage new outcomes from existing data sources, by applying new models and algorithms to create business value
- Influences a client's strategic decisions by using deep industry expertise and deploying innovative Deep Learning analytics solutions in the operational systems Leadership Skills
- Works closely with clients/internal stakeholders to understand their business needs and design a technical solution
- Proving viability of the solution through mechanisms like proof-of-concepts
- Thought Leadership in AI – Developing compelling audience-specific messages and tools. Capture and share best practices and insights internally and with partners and customers.
- Self-driven, energetic, creative with ability to work in global teams.
- Excellent communication skills and a wide knowledge base, to convince the Stakeholders on application of AI/ML
- Provide technical leadership to the team members in relevant topics on AI/ML
- Adaptable - Takes in stride and constantly attunes to the changing needs of a highly dynamic business
- Curious - our key contributors are always seeking to grow their knowledge, to gain new perspectives, and to find better ways forward by researching and showcasing latest AI tools, techniques and applications
- Tenacious - self-starters who will take ownership of projects and bring them to completion despite difficulties or setbacks
- Consulting and Project Management Experience preferred
Functional and Technical Skills
- Experience in building and implementing AI application in any of the two domains - Fraud, risk, marketing, finance, operations for Banks, Fintech, Ecommerce, merchants or retailers
- Has a deep understanding of business value industry requirements and advanced analytic models (statistical, operations research, computing process)
- Responsible for building applications using artificial intelligence/machine learning technology, applying latest industrial and academic developments, prefer Kaggle hackathon participant
- Expertise in deep learning frameworks for Production Systems like Tensorflow, Keras (for RPD and neural net architecture evaluation), PyTorch and Xgboost, Caffe, Theono
- Proficient in Deep Learning algorithm techniques like Random Forest, GBM, KNN, SVM, Bayesian, Text Mining techniques, Multilayer Perceptron, Neural Networks – Feedforward, CNN, LSTM’s GRU’s.
- Optimization techniques – Activity regularization (L1 and L2), Adam, Adagrad, Adadelta concepts; Cost Functions in Neural Nets – Contrastive Loss, Hinge Loss, Binary Cross entropy, Categorical Cross entropy; developed applications in KRR, NLP, Speech and Image processing
- Expertise in classical Machine Learning algorithms like Logistic Regression, Decision trees, Clustering (K-means, Hierarchical and Self-organizing Maps), TSNE, PCA, Bayesian models, Time Series ARIMA/ARMA, Recommender Systems - Collaborative Filtering, FPMC, FISM, Fossil etc
- Extensive experience in statistical tools and programming environments like Python, R, SAS, SQL
- Experience with BIG DATA platforms - Hadoop, Hive, Spark, GPU Clusters for deep learning
Qualifications
- Minimum Graduate degree in Mathematics/Computer Science/Engineering
Follow CutshortShubham Vishwakarma
Full Stack Developer - Averlon