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CoinFantasy is looking for a Senior Blockchain Developer who will be responsible for designing, developing, and implementing blockchain solutions. You will be a core member of the team responsible to make significant contributions to CoinFantasy's ecosystem of products and protocols. 

Responsibilities 

• Design, develop, and deploy blockchain solutions including smart contracts, dApps, tokenization systems, and protocol upgrades.
• Write and audit secure smart contracts (Solidity/Rust) for tokens (ERC-20, ERC-721, SPL), DeFi protocols, and governance systems.
• Research and implement tokenomics models, including supply mechanics, vesting, and utility design.
• Build and optimize multi-chain contracts (Ethereum, Solana, Avalanche, Hyperliquid) with cross-chain interoperability.
• Ensure contract security and gas efficiency, adhering to industry standards (EIPs, BPF) and mitigating vulnerabilities.
• Develop supporting APIs and microservices for blockchain interaction
• Implement event-driven architectures for real-time on-chain data processing and optimize database schemas for blockchain data indexing
• Working closely with Business and software developers in designing and creating innovative solutions. 
• Research, create and document existing and new blockchain structures and proposed solutions.
• Analyzing the needs, resources, and problems of the company and providing necessary solutions.
• Working with open-source projects and codebases.
• Keeping up with current blockchain technology and cryptocurrency trends.

Requirements 

• Bachelor's/Master Degree in Engineering,  IT ,Computer Science or equivalent educational qualification.
• 6+ years of experience in software development and in Blockchain solutions.
• Experience with blockchain development frameworks and tools, such as Truffle, Remix, and Web3.js.
• Strong programming skills.
• Experience with solidity,  rust or golang and node.js must.
• Knowledge in Java & C++ 
• Understanding other programming languages, like Python, C++, JavaScript.
• Strong back-end skills 
• Proficiency in Algorithms & data structures 
• Basic knowledge of cryptography 
• Knowledge of current technology tools like microservice architectures and Docker containers. 

About Us

CoinFantasy is a Play to Invest platform that brings the world of investment to users through engaging games. With multiple categories of games, it aims to make investing fun, intuitive, and enjoyable for users.

It features a sandbox environment in which users are exposed to the end-to-end investment journey without risking financial losses.

Website:

Benefits

• Competitive Salary
• An opportunity to be part of the Core team in a fast-growing company 
• A fulfilling and challenging work experience
• Practically unlimited professional and career growth opportunities

 We are looking for a Senior Site Reliability Engineer (SRE) to take ownership of our multi-cloud blockchain infrastructure and validator node operations. This role is critical in ensuring high performance, availability, and resilience across a range of L1/L2 blockchain protocols. If you're passionate about infrastructure automation, system reliability, and emerging Web3 technologies, we’d love to talk

Responsibilities

• Own and operate validator nodes across multiple blockchain networks, ensuring uptime, security, and cost-efficiency.
•  Architect, deploy, and maintain infrastructure on AWS, GCP, and bare-metal for protocol scalability and performance.
• Implement Kubernetes-native tooling (Helm, FluxCD, Prometheus, Thanos) to manage deployments and observability.
•  Collaborate with our Protocol R&D; team to onboard new blockchains and participate in testnets, mainnets, and governance.
•  Ensure secure infrastructure with best-in-class secrets management (HashiCorp Vault, KMS) and incident response protocols.
•  Contribute to a robust monitoring and alerting stack to detect anomalies, performance drops, or protocol-level issues.
•  Act as a bridge between software, protocol, and product teams to communicate infra constraints or deployment risks clearly.
• Continuously improve deployment pipelines using Terraform, Terragrunt, GitOps practices.
• Participate in on-call rotations and incident retrospectives, driving post-mortem analysis and long-term fixes.

Our Stack

 Cloud & Infra: AWS, GCP, bare-metal- Containerization: Kubernetes, Helm, FluxCD- IaC: Terraform, Terragrunt- Monitoring: Prometheus, Thanos, Grafana, Loki- Secrets & Security: HashiCorp Vault, AWS KMS- Languages: Go, Bash, Python, Types, Blockchain: Ethereum, Polygon, Cosmos, Solana, Foundry, OpenZeppelin

 What You Bring -

4+ years of experience in SRE/DevOps/Infra roles—ideally within FinTech, Cloud, or high-reliability environments.- Proven expertise managing Kubernetes in production at scale.- Strong hands-on experience with Terraform, Helm, GitOps workflows.- Deep understanding of system reliability, incident management, fault tolerance, and monitoring best practices.- Proficiency with Prometheus and PromQL for custom dashboards, metrics, and alerting.- Experience operating secure infrastructure and implementing SOC2/ISO27001-aligned practices.- Solid scripting in Bash, Python, or Go.- Clear and confident communicator—capable of interfacing with both technical and non-technical stakeholders.

Nice-to-Have

First-hand experience in Web3/blockchain/crypto environments.- Understanding of staking, validator economics, slashing conditions, or L1/L2 governance mechanisms.- Exposure to smart contract deployments or working with Solidity, Foundry, or similar toolchains.- Experience with compliance-heavy or security-certified environments (SOC2, ISO 27001, HIPAA).

Why Join Us?

Work at the bleeding edge of Web3 infrastructure and validator tech.- Join a fast-moving team that values ownership, performance, and reliability.- Collaborate with protocol engineers, researchers, and crypto-native teams.- Get exposure to some of the most interesting blockchain ecosystems in the world.

We're building something audacious, something global, in next tech at Mai Labs: a new digital infrastructure layer, an internet architectural rail that puts users, builders, creators and developers first. Our mission? To distribute participatory power to billions of people in the digital economy.

What this actually means: We have built our own L1 blockchain, and a backend technical structure for protocols and ecosystem to make digital infrastructure efficient, secure and more accessible. Our global products and tools are natively built for web 3.0 world. You will work with teams working on tech products across blockchain, and distributed systems – for a real-world problem solving.

We're taking on established paths and conventional wisdom about how the Tech and Internet should work. Underlying principle is to solve the hard problem of protecting user rights, digital intellectual property rights and protection of assets in an age of AI and instant replication.

Cultural Expectations: Our start-up journey involves constant evolution and adaptation to market dynamics. People work on strategizing entirely new systems with a hands-on approach, within short time frames. Resources consciousness is high, and you get the freedom to operate across products, do your best work, and stand ahead in the tech curve. You can expect:

• Thriving in decision-making in an ambiguous, fast-paced environment

• To exhibit exceptional integrity and reliability in promise delivery

• Will collaborative and have an inclusive attitude

• A value outcome driven thinking with resource optimization

If above resonates with you, we will love to have a discussion with you.

Role: Blockchain Developer L2/L3

You will drive technical design, re-design, remodelling and refactoring of systems for robustness and sustainability. As a Blockchain developer, you partner with cross-functional teams, Product Manager as well as senior leaders to create a vision and roadmap for the team and collaborate & drive design discussions, technology choices, and participate in design & code reviews.

Location: Noida (Hybrid)/ Remote / 5days

What will you get to do?

• Developing smart contracts (Chain Code), implementing of Chain Code Interface.
• Create complex distributed ledger/ blockchain architecture solutions.
• Hyperledger Fabric setup & configuration.
• Writing Backend API using Node.js

Profile Expectations:

• Minimum 4+ years of experience in Blockchain development using Node or Go lang.
• Strong exposure in Hyperledger Fabric projects implementation, implementing apps on top of HF using Angular or React front-end and NodeJS services.
• Should be hands-on Consensus like PBFT, Raft, POA, POC, POW etc.
• Good knowledge of Public, Private, and Consortium blockchain.
• Good to have experience in DevOps using Git, Jenkins, Dockers and Kubernetes.
• Experience in any of the Cloud platforms AWS or Azure or IBM Blue Mix is an advantage.

Hiring Process:

• 3-4 rounds of interviews with Function, HR & senior leaders.

Summary:

We are not hiring. We are choosing.

One human who can move with the market like instinct — fast, precise, unshaken. Someone who thrives under pressure, adapts to change quickly, and approaches markets with focus and resilience. This isn’t just a job — it’s growth and challenge combined.

You must:

• React faster than you analyze.
• Adapt without hesitation when momentum shifts.
• Protect capital like it’s sacred, yet attack opportunities without fear.
• See patterns where others see only noise.

Who you are:

• A mind that thrives under pressure and finds rhythm in volatility.
• Someone who sees trading not as charts and numbers, but as a living game of survival.

Apply only if you believe:

Discipline is everything. Consistency is survival. Profit is the side effect.

About Us:

Founded in 2016, we are a crypto trading firm focused on building more than profit — we build people. Here, you will find a positive, collaborative environment where learning never stops and the right mindset turns effort into collective growth.

We’re looking for a highly experienced Backend + Smart Contract Developer with a strong grasp of blockchain architecture and mid-level AWS expertise to join our innovative Web3 team. This is your chance to design and build cutting-edge decentralized systems that scale globally.

• Smart Contract Development:
• Architect, develop, and deploy secure smart contracts (Solidity / Rust) for Ethereum, EVM-compatible chains, and other L1/L2 networks.
• Conduct in-depth testing, auditing, and gas optimization.
• Backend Engineering & Blockchain Architecture:
• Design high-performance backend systems and scalable blockchain architectures.
• Build and maintain APIs, node integrations, and indexing services (e.g., The Graph, Alchemy, Infura).
• Cloud & Infrastructure (AWS):
• Deploy and manage backend services using AWS (EC2, Lambda, API Gateway, S3, RDS) and cloud best practices.
• Implement CI/CD pipelines, containerization (Docker, Kubernetes), and monitoring solutions.
• Security & Optimization:
• Ensure system security, resilience, and gas optimization.
• Apply best practices for mitigating vulnerabilities (reentrancy, overflow, etc.).
• Collaboration & Ownership:
• Work closely with frontend, DevOps, and product teams to deliver robust end-to-end blockchain products.
• Take complete ownership from architecture to deployment.

• 4+ years in backend development and 2+ years in smart contract development.
• Deep understanding of Ethereum, EVM architecture, L2 scaling solutions, and DeFi/NFT standards (ERC20, ERC721, ERC1155).
• Proficiency in Solidity, JavaScript/TypeScript, Node.js, and at least one systems language (Go, Rust, or C++).
• Strong experience in blockchain solution architecture for scalable dApps.
• Mid-level experience with AWS (EC2, Lambda, API Gateway, S3, RDS).
• Familiarity with common smart contract vulnerabilities and mitigation strategies.
• Proven ability to deliver secure, scalable, production-ready blockchain systems.

• Experience with Hardhat, Foundry, Truffle, Web3.js / Ethers.js.
• AWS DevOps experience for blockchain-based apps, including CI/CD pipelines and container orchestration.
• Cross-chain development and interoperability protocol expertise.
• Knowledge of zero-knowledge proofs (ZK-SNARKs/STARKs).
• Experience with audited DeFi protocols.
• Familiarity with L2 rollups, bridges, and advanced blockchain scaling techniques.
• Exposure to NFTs, DeFi mechanics, and modern blockchain infrastructure.

Location: Remote / Hybrid (India preferred)

Type: Full-time

We’re building a lean, high-performance trading desk and are seeking a Senior Crypto Trader with ~6 years of experience to take ownership of live strategies and scale into a Head of Trading role.

What You’ll Do

• Run your own crypto trading strategy from day one
• Full ownership from idea to execution, including risk and performance tracking
• Optimize and operate ultra-low-latency (tick-to-trade, single-digit µs) strategies
• Scale P&L and build infrastructure around your trading edge
• Help shape the future structure and direction of the desk

Requirements

• Currently live with a profitable crypto strategy (or recently)
• Deep understanding of market microstructure, HFT, and execution risk
• Strong Python/C++ skills for rapid development/testing (plus)
• Strategic thinker with leadership potential

Compensation & Perks

• Competitive base + strong P&L share
• Fully remote-friendly (outside US due to regulatory structure)

Preferred locations: Europe / Dubai / Singapore /Remote

If you’re ready to run your own strategies with full autonomy and a clear path to Head of Trading, apply now or DM for a confidential discussion

Summary:

We are not hiring. We are choosing.

One human who can move with the market like instinct — fast, precise, unshaken. Someone who thrives under pressure, adapts to change quickly, and approaches markets with focus and resilience. This isn’t just a job — it’s growth and challenge combined.

You must:

• React faster than you analyze.
• Adapt without hesitation when momentum shifts.
• Protect capital like it’s sacred, yet attack opportunities without fear.
• See patterns where others see only noise.

Who you are:

• A mind that thrives under pressure and finds rhythm in volatility.
• Someone who sees trading not as charts and numbers, but as a living game of survival.

Apply only if you believe:

Discipline is everything. Consistency is survival. Profit is the side effect.

About Us:

Founded in 2016, we are a crypto trading firm focused on building more than profit — we build people. Here, you will find a positive, collaborative environment where learning never stops and the right mindset turns effort into collective growth.

CoinFantasy is looking for a Senior Blockchain Developer who will be responsible for designing, developing, and implementing blockchain solutions. You will be a core member of the team responsible to make significant contributions to CoinFantasy's ecosystem of products and protocols.

Responsibilities

• Design, develop, and deploy blockchain solutions including smart contracts, dApps, tokenization systems, and protocol upgrades.
• Write and audit secure smart contracts (Solidity/Rust) for tokens (ERC-20, ERC-721, SPL), DeFi protocols, and governance systems.
• Research and implement tokenomics models, including supply mechanics, vesting, and utility design.
• Build and optimize multi-chain contracts (Ethereum, Solana, Avalanche, Hyperliquid) with cross-chain interoperability.
• Ensure contract security and gas efficiency, adhering to industry standards (EIPs, BPF) and mitigating vulnerabilities.
• Develop supporting APIs and microservices for blockchain interaction
• Implement event-driven architectures for real-time on-chain data processing and optimize database schemas for blockchain data indexing
• Working closely with Business and software developers in designing and creating innovative solutions.
• Research, create and document existing and new blockchain structures and proposed solutions.
• Analyzing the needs, resources, and problems of the company and providing necessary solutions.
• Working with open-source projects and codebases.
• Keeping up with current blockchain technology and cryptocurrency trends.

Requirements

• Bachelor's/Master Degree in Engineering, IT ,Computer Science or equivalent educational qualification.
• 6+ years of experience in software development and in Blockchain solutions.
• Experience with blockchain development frameworks and tools, such as Truffle, Remix, and Web3.js.
• Strong programming skills.
• Experience with solidity, rust or golang and node.js must.
• Knowledge in Java & C++
• Understanding other programming languages, like Python, C++, JavaScript.
• Strong back-end skills
• Proficiency in Algorithms & data structures
• Basic knowledge of cryptography
• Knowledge of current technology tools like microservice architectures and Docker containers.

About Us

CoinFantasy is a Play to Invest platform that brings the world of investment to users through engaging games. With multiple categories of games, it aims to make investing fun, intuitive, and enjoyable for users.

It features a sandbox environment in which users are exposed to the end-to-end investment journey without risking financial losses.

Website:

Benefits

• Competitive Salary
• An opportunity to be part of the Core team in a fast-growing company
• A fulfilling and challenging work experience
• Practically unlimited professional and career growth opportunities

Hiring: Senior Backend + Smart Contract Developer (Web3)We’re looking for a highly experienced Backend + Smart Contract Developer with a strong grasp of blockchain architecture and mid-level AWS expertise to join our innovative Web3 team. This is your chance to design and build cutting-edge decentralized systems that scale globally.Key ResponsibilitiesSmart Contract Development:Architect, develop, and deploy secure smart contracts (Solidity / Rust) for Ethereum, EVM-compatible chains, and other L1/L2 networks.Conduct in-depth testing, auditing, and gas optimization.Backend Engineering & Blockchain Architecture:Design high-performance backend systems and scalable blockchain architectures.Build and maintain APIs, node integrations, and indexing services (e.g., The Graph, Alchemy, Infura).Cloud & Infrastructure (AWS):Deploy and manage backend services using AWS (EC2, Lambda, API Gateway, S3, RDS) and cloud best practices.Implement CI/CD pipelines, containerization (Docker, Kubernetes), and monitoring solutions.Security & Optimization:Ensure system security, resilience, and gas optimization.Apply best practices for mitigating vulnerabilities (reentrancy, overflow, etc.).Collaboration & Ownership:Work closely with frontend, Dev Ops, and product teams to deliver robust end-to-end blockchain products.Take complete ownership from architecture to deployment.Must-have Qualifications4+ years in backend development and 2+ years in smart contract development.Deep understanding of Ethereum, EVM architecture, L2 scaling solutions, and De Fi/NFT standards (ERC20, ERC721, ERC1155).Proficiency in Solidity, Java Script/Type Script, Node.js, and at least one systems language (Go, Rust, or C++).Strong experience in blockchain solution architecture for scalable d Apps.Mid-level experience with AWS (EC2, Lambda, API Gateway, S3, RDS).Familiarity with common smart contract vulnerabilities and mitigation strategies.Proven ability to deliver secure, scalable, production-ready blockchain systems.Preferred QualificationsExperience with Hardhat, Foundry, Truffle, Web3.js / Ethers.js.AWS Dev Ops experience for blockchain-based apps, including CI/CD pipelines and container orchestration.Cross-chain development and interoperability protocol expertise.Knowledge of zero-knowledge proofs (ZK-SNARKs/STARKs).Experience with audited De Fi protocols.Familiarity with L2 rollups, bridges, and advanced blockchain scaling techniques.Exposure to NFTs, De Fi mechanics, and modern blockchain infrastructure? Location: Remote / Hybrid (India preferred) ? Type: Full-time