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Senior Blockchain Developer

Keen Technology Solutions LLC
Chicago, IL Contractor
POSTED ON 6/5/2026
AVAILABLE BEFORE 7/5/2026

Senior Blockchain Developer

Chicago, IL, USA (Hybrid)

Long term W2 contract.

Must have 10 yrs of Blockchain developer experience
Must have 10 Java SpringBoot experience
Must have SDLC experience
Must be able to code in Solidity, Java, NodeJs, Python, GoLand, and Rust
Must have outstanding understanding of data structures and algorithms

Required Qualifications:
Java Springboot experience is a must
Experience working as a Blockchain Developer or a similar role in the IT department
Experience leading to a complete understanding of the software development lifecycle
Expertise in building robust systems (resiliency, fault tolerance, scalability) at scale
Demonstrate excellent ability to code in various languages such as Solidity, Java, NodeJs, Python, GoLang, Rust and others
Experience in working with various types of cryptography to secure data
Outstanding understanding of data structures and algorithms
Knowledge of various cybersecurity guidelines and protocols
Strong understanding and knowledge of various kinds of cyberattacks
Ability to work in a team or individually as and when required
Possess excellent communication skills
Have keen eye for details
Manage multiple projects simultaneously

Preferred Qualifications:
Experience working with Cloud platforms such as MS Azure, AWS preferred

Senior Blockchain Developer Summary:
As a Blockchain Developer, you are responsible for developing application features and interfaces using blockchain technology
You will be also responsible for designing and developing a system that is secure, reliable and scalable
Your primary goal for this job role will be designing, implementing, and administering a secure blockchain network
You should be highly knowledgeable about various blockchain technologies
You should also have an excellent understanding of cryptography and its uses in the blockchain network
You should be knowledgeable about packing & deploying apps via CI/CD pipelines to a cloud platform

Job Responsibilities:
Architect, develop and deploy decentralized applications providing permissioned access to data at both the smart contract and protocol level
Develop & Interacting with Smart Contracts implemented on most common Blockchain/DLT technology platforms
Oracle development (connecting "off-chain" data to the blockchain)
Construct integration libraries to interface with our server and APIs
Collaborate closely with the rest of the engineering team to review application requirements, help plan implementation details and estimate delivery timelines
Provide mentorship to your peers in the engineering team through education on best practices
Preparing documentation on the blockchain development processes
Adhering to all the rules and regulations of data protection for digital payments
Staying updated with the latest crypto technologies for data protection

Hourly Wage Estimation for Senior Blockchain Developer in Chicago, IL
$55.00 to $68.00
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