Lead Solidity Developer

**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.

• 4+ years of development experience and at least 1 year of smart contract developer experience in solidity
• Solid experience in delivering resilient and secure code in Solidity
• Knowledge and experience of the test-driven development
• Very good understanding of the Blockchain technologies, especially Ethereum
• Familiar with the common Smart Contract vulnerabilities
• Solid understanding about Ethereum infrastructure, e.g. like Gnosis, TheGraph

Designation - 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

Requirements

Responsibilities

Hiring Process

Arcana is The Storage Layer for Ethereum with a Privacy Stack for developers to build secure and privacy preserving apps. Users care about privacy now more than ever before and it is becoming a first-class citizen in the modern development stack. Arcana makes it easier for apps to be privacy-focused out of the box.

With Arcana’s privacy stack, developers give control of data back to their users. They can easily integrate our SDK with their apps and use our modular feature blocks for Authentication, Identity Management, Encryption, Access Control, and Decentralized Storage. All of which are secured by and verifiable on the blockchain.

Visit http://www.arcana.network/">www.arcana.network to learn more about us, our backers, and our offerings

Arcana is stack of services to help developers build more secure and privacy preserving apps.

We are looking to onboard a lead for our blockchain engineering team. At Arcana we are building our own sovereign EVM compatible chain with its own set of validators. Security, Scalability and Interoperability are the primary goals of the blockchain and we're looking to put together some of the best minds to achieve this. This is a full-time role and completely remote friendly.

• Experience in managing a team of engineers for at least 2+ years.
• Must have significant experience with Geth (Go Ethereum) or equivalent blockchain nodes and p2p
• Must be proficient with Golang
• Deep understanding of Blockchain, Solidity, Assembly, and the EVM
• Experience in standard software practices including clean code, unit tests and CI/CD
• Knowledge of Rust, Javascript, Typescript or Node.js is a plus
• Active member of the dev community will be a plus (e.g. experience contributing to OSS or EIPs)
• Experience in leading and communicating with remote teams

https://electronlabs.org/">Electron Labs is building a new protocol to make various blockchains interoperable. Our goal is to enable cross-chain contracts to connect with each other in the same way as same-chain contracts connect i.e., via function calls. We have developed a new in-house tech called https://garvitgoel.medium.com/what-is-bdlc-and-how-it-works-5716fbbacde8">Bi-Directional Light Client that allows a smart contract to independently verify whether the cross-chain transactions submitted to it are valid. We further use ZK-SNARKS to reduce the gas cost of running the light client on-chain.

Desired Qualifications

1. A good grasp of blockchain fundamentals, various consensus algorithms, and detailed knowledge of at least one major blockchain.
2. Previous work (demonstrable) in blockchain technology, web3, or protocol development
3. In-depth understanding of Number Theory and Cryptography. Knowledge of Cryptographic Algorithms and zero-knowledge proofs are highly preferred.
4. Superior mathematics and problem-solving skills, excellent pattern recognition, passion for solving puzzles.
5. Proficiency in one of the following languages: Go-lang, Rust, is highly preferred. Working knowledge of Solidity, Javascript, Python, or similar scripting languages puts you in front of our list
6. Grounded research skills and an ability to absorb documentation quickly
7. Strong background in Computer Science. Knowledgeable in Algorithms and Data Structures.

Roles and Responsibilities

1. You will be assigned one blockchain (Ethereum /Polygon /NEAR /tendermint /Polkadot/Aleo). You will be required to implement the light client of this blockchain in https://docs.circom.io/">Circom language (Domain Specific Language for ZK-SNARKS).
2. Write go-lang based networking relayers that enable communication between blockchains and zk-provers.
3. Maintain relayer and zk-prover infrastructure (cloud machine and codebase)
4. Write kickass documentation.

Location: Delhi NCR, India | Remote

At Olegacy, we build applications connecting people to Web3. Our office is in Bengaluru and Dubai. We are expanding to our Dubai office and would love to invite all individuals who are passionate about the blockchain space to apply. We are currently seeking a Blockchain Engineer to help develop and build a decentralized finance application. The ideal candidate is a self-inspired individual who is passionate about blockchain technologies and disrupting current potential financial norm.

Responsibilities

• Work with the team to achieve product update milestones within the set time frames
• Design, develop, program, test, debug and maintain smart contracts code for a decentralized application
• Apply the latest cryptography techniques to protect digital transaction data against cyberattacks and information hacks

• Evaluate scalability, security, performance and gas optimization of the decentralized application
• Collaborate with the team on API design
• Collaborate with the team on planning and implementing frictionless user experiences

Qualifications

• Bachelor's / Master's degree in Computer Science
• Strong proficiency in Cryptography
• Strong proficiency in smart contracts written in Solidity
• Strong proficiency in JavaScript, NODE.js and C++
• Experience with blockchain technology​
• Bonus: Understanding of the intricacies of iOS and Android
• Bonus: Experience developing NFTs on Ethereum

Soft Skills

• Team Player
• Strong English language communication skills
• Self-starter
• Enjoys working in a fast-paced start-up culture
• Growth mindset

We are a Quantitative Trading firm building proprietary trading products and infrastructure for crypto markets (both DeFi and CeFi). We are focusing heavily on building up our DeFi capabilities and are looking for a hungry DeFi native engineer to help us conceptualize and build our DeFi strategies and infrastructure.

We are a high-output research team of 5 from a variety of backgrounds, spanning from Machine Learning and System Engineering, all the way to fintech and business.

We build products for both internal and external use to uncover alpha opportunities in different areas of crypto markets, including trading both on centralized and decentralized exchanges (DeFi) and building systems to streamline order execution, gather and digest complex timeseries data streams.

We are looking for a DeFi Software Engineer who has a deep understanding of blockchain and is curious about algorithmic trading. You should be excited about making sense of large quantities of data, and decision modelling on time series, real-time data.

Responsibilities

• Designing, building and testing smart contracts and related infrastructure
• Researching new DeFi protocols and its connectors and building on them
• Building real-time monitoring tools and working with our team on latency-sensitive operations
• Ethereum Node Infrastructure setup and maintenance
• Work with the team on devising new trading strategies and uncovering opportunities

Qualifications

• Deep technical and practical understanding of DeFi protocols and DevOps practices for interfacing with them (both Ethereum and any other relevant one) - Must have extensive knowledge of Solidity, smart contract development (web3js or ethersjs) and testing.
• Knowledge of Javascript (knowledge of Golang/Python programming is nice to have).
• Must be comfortable working with either hardhat or truffle.
• Comfortable working in a dynamic, research-oriented team with several ongoing concurrent projects
• You look forward to working with an interdisciplinary team that longs to find solutions together.
• Knowledge of trading isn't required but interest in the field is paramount. If you are a self-taught wiz who has tried its hands at DeFi trading and AMM, even better!

The number of years of experience does not matter as long as you have built complex projects from scratch, a burning desire to learn more, constantly improve yourself and solving tricky problems on a daily basis. We're a small team so you can assure yourself that whatever you contribute - in terms of an engineer, or otherwise - is always heard and discussed.

Benefits

• Competitive salary and performance-based bonuses
• A young startup work environment, where your initiatives and ideas count and are rewarded
• A unique open research environment, where everybody contributes and sees the full spectrum of our work, from inception to production
• The chance to shape our firm's legacy and exchange knowledge with the team on every part of what we do.

The role location is preferably Hyderabad with to be able to brainstorm in person with the R&D team, but remote in India is also possible.
Please share github profiles and details of previous projects worked on (both commercial and personal).