Blockchain Developer Job Description and KRAs

A Blockchain Developer builds decentralised applications and smart contracts on platforms such as Ethereum or Hyperledger. At the entry level they write and test smart contracts, connect front ends to the chain and fix issues under the guidance of senior engineers. A good junior blockchain developer writes careful contract code, understands gas and security risks, and tests thoroughly because deployed contracts are hard to change. The role sits in a product or blockchain engineering team and reports to a blockchain lead or senior software engineer.

Detail	For this role
Department	Information Technology
Level	Entry level
Reports to	Blockchain Lead
Direct reports	None
Experience	Fresher or up to 2 years in blockchain development

Blockchain Developer job description template

Copy this job description, replace the text in square brackets and post it on your careers page or a job portal.

Job title: Blockchain Developer

Department: Information Technology

Reports to: Blockchain Lead

Location: [City], [office, branch or site]

About the role

Key responsibilities

Write, test and deploy smart contracts in Solidity or a similar language from clear specifications.
Build the logic that reads and writes to the blockchain and handles transactions safely.
Connect web front ends to contracts using libraries such as web3 or ethers.
Write thorough unit tests and run contracts on test networks before any main deployment.
Check contracts for common security risks such as reentrancy and integer overflow with senior review.
Estimate and reduce gas costs so transactions stay affordable for users.
Fix reported issues and add tests so the same problem cannot return.
Document contract functions, events and deployment steps for the team.
Follow secure key handling practices and never expose private keys in code.
Learn the platform, tooling and security patterns with support from senior engineers.

Requirements

Graduate in computer science, IT or engineering
Working knowledge of Solidity and blockchain concepts
A deployed project or portfolio is an advantage
Fresher or up to 2 years in blockchain development

KRAs and KPIs for a Blockchain Developer

Key result areas for the appraisal form, each with a KPI you can measure every month or quarter.

Key result area	How to measure it
Contract delivery	Assigned contracts and features delivered within sprint estimates
Security	No critical vulnerability found in own contracts during audit or review
Test coverage	Contracts covered by tests to the team target before deployment
Gas efficiency	Transaction gas cost kept within the agreed budget for each function
Code quality	Pull requests pass review with limited rework
Learning	New blockchain and security skills picked up each quarter

Skills and tools

SoliditySmart contract developmentWeb3 or ethers librariesBlockchain fundamentalsContract security basicsUnit testingJavaScriptCareful thinkingWillingness to learn

Tools used day to day: Solidity, Hardhat, Remix, MetaMask, ethers.js, Git.

Reporting line and career path

Moves up from: Software Trainee, Backend Developer, Intern
Next roles: Senior Blockchain Developer, Smart Contract Auditor, Blockchain Architect

Interview questions for a Blockchain Developer

What is a smart contract and why is it hard to change after deployment?
Explain a reentrancy attack and how you prevent it.
How do you test a contract before deploying to a main network?
What is gas and how do you keep transaction costs low?
How do you connect a web front end to a smart contract?
Tell me about a decentralised app you built and what was tricky.

Managing a Blockchain Developer in ZeniaHR

AttendanceOffice or hybrid on a general shift, with focus time for careful contract work. Web punch on the approved office network covers office days, and mobile app punch with a location check records the work from home days the work terms policy allows.LeaveNew joiners serve probation, so watch the probation end in the probation queue and ask the manager for a review before it lapses. The reporting manager approves leave first, then HR, and the leave apply preview shows the balance after and any warnings.Performance and KRAsAdd the KRAs above as goals in the review cycle and confirm the developer through the probation review the manager rates from 1 to 5. Once confirmed, run a quarterly review and watch security and test coverage each month.

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Frequently asked questions

What does a blockchain developer do?

A blockchain developer builds decentralised applications and smart contracts on platforms such as Ethereum or Hyperledger. They write and test contract code, connect front ends to the chain, manage transactions and guard against security risks. Because deployed contracts are hard to change, careful testing and review are a large part of the job.

What language do blockchain developers use?

On Ethereum and similar chains, Solidity is the main smart contract language, and developers also use JavaScript with libraries such as ethers or web3 to connect apps. Other platforms use languages like Rust or Go. A fresher in India usually starts with Solidity, test networks and tools such as Hardhat and Remix.

Is blockchain development a good career in India?

Blockchain has a smaller but growing job market in India, mostly in product startups, crypto firms and some enterprise projects. Demand rises and falls with the market, so many developers keep strong general programming skills too. Those who master contract security and testing stand out, since mistakes on chain are costly and public.