API Developer ( Lead )

Job title: Lead API Developer

Location: Barcelona, Spain / Dublin, Ireland

Contract type: B2B Contract + Permanent

This is a Contract to hire role . Initially 12 Months Contract and After that candidate needs to work on our client payroll as a permanent employee.

As a Lead API Developer, you will be

responsible for designing, developing,

and maintaining APIs that enable the

interaction between distinct software

systems.

• You will play a crucial role in modern

software development and digital

transformation strategies by ensuring that

APIs are high-performance, reusable, and

reliable.

Primary Responsibilities:

Design and Develop APIs: Create high-

performance, reusable, and reliable APIs that

meet business needs.

• Collaborate with Teams: Work with other

software developers and business analysts to

understand user needs and translate them into

technical requirements.

• Integrate APIs: Ensure seamless integration of

APIs with existing data and software systems.

• Optimize for Performance: Optimize APIs for

speed, efficiency, and scalability.

• Testing and Troubleshooting: Test APIs to

ensure responsiveness and efficiency and identify

and fix bugs or bottlenecks.

• Documentation: Document API development

processes, standards, and guidelines for future

reference and other developers.

• Technical Support: Provide technical support for

APIs, including troubleshooting and problem

resolution.

• Ensure Security: Implement appropriate

encryption and data protection measures to

ensure API security.

• Coaches team members and leads teams as

necessary.

Skills:

Experience with API Management

Platforms: Familiarity with tools like

MuleSoft, Apigee, or similar.

• Knowledge of Security Protocols:

Understanding of API security protocols

and best practices.

• Agile Methodologies: Experience

working in an Agile development

environment.

• Proficiency in Programming

Languages: Strong coding skills in 2 of 3

languages - Java, Python, GoLang.

• Microservices: Experience building

microservices in AWS and Azure and

deployment and use of micro services in

the Amazon and Azure ecosystem.

• Experience in API Design: Deep

understanding of API design principles

and best practices.

• Integration Skills: Experience in

integrating APIs with existing systems.

• Problem-Solving Skills: Ability to

troubleshoot and resolve issues

efficiently.

• Attention to Detail: Strong eye for detail

and a meticulous approach to

development.

• Communication Skills: Excellent

communication skills to collaborate

with cross-functional teams.

Business Knowledge

• Strong understanding of reliability and

production management, with a focus on

maintaining high availability and stability

across services.

• Risk-aware mindset with knowledge of key

operational risks in financial institutions,

applying this insight to develop resilient and

compliant solutions.

• Promotes a culture of continuous

improvement, driving proactive

enhancements in processes and systems.

Experience

• Experience in system and software

security (SSO, Kerberos, LDAP, Windows

AD, etc.), ensuring robust identity and

access management.

• Application of engineering principles to

production management, supporting

scalable and efficient operations.

• Proven track record in automation,

effectively reducing manual work and

enhancing workflow productivity and

consistency.