Blockchain Developer

6 days ago

Abuja, FCT, Nigeria Convexity Full time ₦600,000 - ₦1,200,000 per year

Overview

We are looking for a Blockchain / Smart Contract Developer & Backend Engineer with deep experience building decentralized applications (dApps), multi-chain integrations, and backend systems using TypeScript and The role requires strong technical expertise across blockchain ecosystems, backend architecture, and microservices deployment.

Key Responsibilities

Blockchain / Smart Contract Development

● Design, develop, and deploy smart contracts across multiple blockchains (e.g., Ethereum, BNB Chain, Polygon, Solana, Avalanche, etc.).

● Write efficient, secure, and gas-optimized contracts in Solidity or relevant languages per chain.

● Integrate on-chain logic with backend systems and APIs.

● Conduct contract testing, audits, and simulation using tools like Hardhat, Foundry, or Truffle.

● Maintain interoperability between chains via bridges, oracles, and cross-chain messaging protocols.

● Keep up with evolving blockchain technologies, standards (ERC, BEP, SPL, etc.), and tooling.

Backend Engineering

● Architect, build, and maintain backend services using , TypeScript, NestJS, or

● Develop and manage microservices-based architectures supporting blockchain operations, APIs, and user interactions.

● Build robust RESTful and GraphQL APIs for dApp frontends and third-party integrations.

● Implement data models and persistence layers using PostgreSQL and MongoDB.

● Design asynchronous and event-driven systems for real-time blockchain data processing.

● Integrate external services and SDKs (wallets, , , etc.).

● Implement authentication, authorization, and role-based access control in distributed environments.

● Ensure backend scalability, security, and fault tolerance in production systems.

Requirements

● Proven experience as a Blockchain Developer and Backend Engineer.

● Strong knowledge of Solidity, EVM-based chains, and smart contract deployment pipelines.

● Proficiency in TypeScript, , Express, or NestJS.

● Hands-on experience with microservices, Docker, and API Gateway design.

● Proficient in PostgreSQL and MongoDB, including schema design and optimization.

● Solid understanding of blockchain architecture, transaction flow, gas mechanics, and contract interaction models.

● Familiarity with CI/CD, GitHub Actions, or similar DevOps pipelines.

● Experience using Web3 libraries (e.g., , ) for blockchain interactions.

● Strong grasp of security best practices in both web and blockchain contexts.

Preferred Qualifications

● Experience with non-EVM blockchains (e.g., Solana, Cosmos, Near, Aptos).

● Understanding of cross-chain messaging, bridging, or L2 scaling solutions.

● Familiarity with IPFS, The Graph, or subgraph indexing.

● Knowledge of event streaming and real-time data pipelines (Kafka, Redis, RabbitMQ).

● Prior work on DeFi, NFT, or DAO projects.

● Contributions to open-source blockchain frameworks or libraries.

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