Senior Blockchain Developer – Java

Methodius Ltd; Dublin; On-site; EUR 90,000 - 120,000; Full time

Benefits offered by this job

Annual Bonus Scheme

Contributory Pension

Private Medical Insurance

Life Assurance & Long-Term Disability

Employee Assistance Programme

22 days annual leave + 10 public holidays

Continuous Learning & Development

Company discounts

On-site parking

Bike-to-work scheme

Lunch & Learn sessions

Company discounts

On-site parking

Bike-to-work scheme

Job summary

A technology company in Dublin is seeking an experienced Blockchain developer. You will design and deliver backend systems integrating Java platforms with blockchain technologies. Responsibilities include building scalable services, secure APIs, and collaborating in Agile environments. Key requirements include strong Java skills and knowledge of blockchain concepts. The role is permanent, offers competitive salary, benefits like bonus schemes, medical insurance, and a hybrid working model.

Qualifications

• Strong experience in Java backend development.
• Understanding of blockchain and distributed ledger technologies.
• Knowledge of security practices in application development.
• Experience integrating backend systems with blockchain platforms.
• Knowledge of secure coding practices, cryptography basics, and application security.
• Experience with relational or NoSQL databases and distributed systems.

Responsibilities

• Design and build scalable backend services using Java.
• Develop and integrate blockchain components.
• Build secure RESTful APIs for system integrations.
• Ensure security, data integrity, and consistency across on-chain and off-chain systems.
• Contribute to system architecture, performance optimization, and reliability in distributed environments.
• Collaborate with cross-functional teams in Agile delivery environments.
• Provide technical guidance, code reviews, and mentorship to engineering team members.

Skills

Java (8+)

Spring Boot

REST API design

Blockchain concepts

Secure coding practices

Relational or NoSQL databases

Databases (SQL/NoSQL)

Job description

My client is looking for an experienced Blockchain developer to join their growing team in Dublin city centre. You’ll be responsible for designing and delivering backend systems that integrate enterprise Java platforms with blockchain and distributed ledger technologies.

Responsibilities

• Design and build scalable backend services using Java and microservices architecture.
• Develop and integrate blockchain-enabled components, including distributed ledger interactions and transaction workflows.
• Build secure RESTful APIs for system integrations.
• Ensure security, data integrity, and consistency across on-chain and off-chain systems.
• Contribute to system architecture, performance optimization, and reliability in distributed environments.
• Collaborate with cross-functional teams in Agile delivery environments.
• Provide technical guidance, code reviews, and mentorship to engineering team members.

Core Skills

• Strong Java (8+) backend development experience.
• Spring Boot, microservices, and REST API design.
• Understanding of blockchain concepts such as distributed ledgers, consensus, and transaction models.
• Experience integrating backend systems with blockchain platforms.
• Knowledge of secure coding practices, cryptography basics, and application security.
• Experience with relational or NoSQL databases and distributed systems.

Additional Experience (Optional)

• Smart contracts or blockchain frameworks/SDKs.
• Cloud-native development, containers, and orchestration tools.
• CI/CD pipelines, DevOps practices, and automated testing.
• Event-driven architectures or messaging systems.
• Work in high-security or large-scale enterprise platforms.
• Technical leadership or solution design experience.

Permanent Role.

Salary dependent on candidate experience. Benefits: Annual Bonus Scheme. Contributory Pension. Private Medical Insurance. Life Assurance & Long-Term Disability. Employee Assistance Programme. 22 days annual leave + 10 public holidays. Continuous Learning & Development. Access to extensive training & certification resources. Lunch & Learn sessions. Additional perks including company discounts, on-site parking, and bike-to-work scheme

Based in Dublin, Ireland. Hybrid (2 days onsite per week). Candidates must be eligible to work in Ireland/EU.

For more information, please contact David Coyle at 01 635 1748 or email [e-mail]