EY (Ernst & Young) is a global leader in assurance, tax, consulting, and strategy and transactions services. As one of the "Big Four" professional services firms, it operates a vast network of member firms across more than 150 countries, employing nearly 400,000 professionals worldwide to help clients navigate complex regulatory and business challenges.

In Spain, EY maintains a significant footprint with a major headquarters in Madrid and a strong presence in Barcelona and other regional hubs. The firm is a major recruiter of international talent, offering diverse opportunities in digital transformation, financial services, and sustainability, often within multicultural teams where English is a primary working language.

EY was formed in 1989 through the merger of Ernst & Whinney and Arthur Young & Co. Its roots date back to the 19th century with founders Arthur Young and Alwin C. Ernst, who established their respective firms in the US and UK.

For international professionals

EY Spain frequently hires international profiles for its Global Delivery Services and specialized consulting arms.
The company provides a structured career development framework and extensive internal training programs.
Many roles in technology and consulting hubs allow for hybrid work arrangements.
The firm has a dedicated International Mobility program to facilitate internal transfers and relocations.
Offices are located in major Spanish business hubs, offering flexibility in geographic placement.

Core Banking Technical Architect (Integration & APIs)

This job was originally posted in Spanish and automatically translated to English. You'll most likely need Spanish to apply.

Job Description

At EY, we shape the future with confidence. Here you will find more than a job: an opportunity to grow, learn, and leave a mark.

Join our 7,000 professionals in Spain across 15 offices and a global network of 400,000 people working every day to transform businesses and societies.

ShapeTheFutureWithConfidence | #EYCareers | #BuildingABetterWorkingWorld

The opportunity

Within the Emerging Technologies area for the Financial and Insurance Sector, the candidate will join strategic banking transformation programs, being responsible for the definition and evolution of the technical architecture in Core Banking environments, with a special focus on integration, apification, and the modernization of legacy systems.

The role requires designing solutions that enable the transition toward API-first, distributed, and event-driven architectures, ensuring the modularity, scalability, and sustainability of banking systems.

You will act as a technical reference, guaranteeing the viability of functional solutions and aligning architectural decisions with the principles of efficiency, simplicity, decoupling, and the progressive evolution of systems.

Your main functions:

Definition of the technical integration architecture in Core Banking environments:

Design of integration layers
Decoupling strategies between core and channels

Design and evolution of architectures:

Microservices
Event-driven architecture
API-first

Definition and design of:

APIs (REST / OpenAPI)
Service contracts
Versioning strategies and API governance

Design of the integration model:

Orchestration vs choreography
Synchronous vs asynchronous processes

Participation in the apification of banking services:

Exposure of core capabilities
Orchestration vs choreography
Synchronous vs asynchronous processes

Participation in the apification of banking services:

Exposure of core capabilities
Preparation for Open Banking

Ensuring architectural quality in terms of:

Scalability
Performance
Resilience
High availability
Traceability and observability

Definition of technical standards:

API security (OAuth2, JWT)
Logging, monitoring, and tracing

Evaluation of technological solutions and vendors:

API Management
Middleware
Integration platforms

Collaboration with:

Functional teams (core banking)
Development teams
Infrastructure and cloud teams

Participation in core modernization programs:

Evolution of legacy systems
Migration and coexistence strategies

Requirements:

Degree in Computer Engineering, Telecommunications, or similar
Valued:
- Cloud certifications (AWS, Azure, GCP)
- Certifications in architecture or integration

Experience

Technical Architecture

Distributed architectures
Microservices
Highly scalable systems

Design of solutions oriented toward:

Decoupling
Incremental evolution
Complexity reduction

Knowledge and application of architectural principles:

Domain-Driven Design (DDD) (valued)
Lean Architecture (valued)

Integration and APIs

Proven experience in:

Design and implementation of REST APIs
Definition of OpenAPI / Swagger contracts

Use of integration platforms:

API Management (Apigee, Kong, MuleSoft, Azure API Management)
Middleware / ESB

Experience in messaging:

Kafka
RabbitMQ
IBM MQ or similar

Banking knowledge: Banking knowledge is essential.

Understanding of:

Core banking
Account operations
Financial products (asset and liability)

Regulation:

PSD2 / Open Banking
API security
Exposure of regulated services

What do we offer you?

Well-being and personal benefits

EY Wellbeing HUB, with physical health programs (Wellhub) and mental well-being.
Life and Accident Insurance.
EY Flex flexible compensation plan: transport, training, restaurant vouchers, childcare, among others.
Bankinter office with special conditions for EY professionals.

Flexibility and work-life balance

Hybrid work model, with flexibility depending on the project and team.

Professional development

EY University: continuous training with an individualized itinerary (more than 100 hours per year)
Defined career plan, with annual reviews and real growth opportunities.
Support from day one thanks to the roles of:

Buddy for your integration.
Counselor for your professional development throughout your career.

Culture and work environment

Dynamic, collaborative, and inclusive environment.
Opportunity to work with global and multidisciplinary teams.
Constant expansion of your professional network in a leading firm.

Social commitment

Participation in social commitment initiatives through the EY Foundation and its own Social Impact programs in Spain.
Real commitment to sustainability, diversity, and corporate responsibility.

#LI-HYBRID

View original advert (Spanish)

En EY, damos forma al futuro con confianza. Aquí encontrarás más que un trabajo: una oportunidad para crecer, aprender y dejar huella.

Únete a nuestros 7.000 profesionales en España y 15 oficinas y a una red global de 400.000 personas que trabajan cada día para transformar negocios y sociedades.

ShapeTheFutureWithConfidence | #EYCareers | #BuildingABetterWorkingWorld

La oportunidad

Dentro del área de Emerging Technologies de Sector Financiero y de Seguros, a persona se incorporará a programas estratégicos de transformación bancaria, siendo responsable de la definición y evolución de la arquitectura técnica en entornos Core Banking, con especial foco en la integración, apificación y modernización de sistemas legacy.

El rol requiere diseñar soluciones que permitan la transición hacia arquitecturas API-first, distribuidas y orientadas a eventos, asegurando la modularidad, escalabilidad y sostenibilidad de los sistemas bancarios.

Actuará como referente técnico, garantizando la viabilidad de las soluciones funcionales y alineando las decisiones de arquitectura con los principios de eficiencia, simplicidad, desacoplamiento y evolución progresiva de los sistemas.

Tus principales funciones:

Definición de la arquitectura técnica de integración en entornos Core Banking:

Diseño de capas de integración
Estrategias de desacoplamiento entre core y canales

Diseño y evolución de arquitecturas:

Microservicios
Event-driven architecture
API-first

Definición y diseño de:

APIs (REST / OpenAPI)
Contratos de servicio
Estrategias de versionado y gobierno de APIs

Diseño del modelo de integración:

Orquestación vs coreografía
Procesos síncronos vs asíncronos

Participación en la apificación de servicios bancarios:

Exposición de capacidades del core
Orquestación vs coreografía
Procesos síncronos vs asíncronos

Participación en la apificación de servicios bancarios:

Exposición de capacidades del core
Preparación para Open Banking

Asegurar la calidad de la arquitectura en términos de:

Escalabilidad
Rendimiento
Resiliencia
Alta disponibilidad
Trazabilidad y observabilidad

Definición de estándares técnicos:

Seguridad en APIs (OAuth2, JWT)
Logging, monitoring y tracing

Evaluación de soluciones tecnológicas y vendors:

API Management
Middleware
Plataformas de integración

Colaboración con:

Equipos funcionales (core banking)
Equipos de desarrollo
Equipos de infraestructura y cloud

Participación en programas de modernización de core:

Evolución de sistemas legacy
Estrategias de migración y coexistencia

Requisitos:

Grado en Ingeniería Informática, Telecomunicaciones o similar
Valorable:
- Certificaciones cloud (AWS, Azure, GCP)
- Certificaciones en arquitectura o integración

Experiencia

Arquitectura Técnica

Arquitecturas distribuidas
Microservicios
Sistemas altamente escalables

Diseño de soluciones orientadas a:

Desacoplamiento
Evolución incremental
Reducción de complejidad

Conocimiento y aplicación de principios de arquitectura:

Domain-Driven Design (DDD) (valorable)
Lean Architecture (valorable)

Integración y APIS

Experiencia demostrada en:

Diseño e implementación de APIs REST
Definición de contratos OpenAPI / Swagger

Uso de plataformas de integración:

API Management (Apigee, Kong, MuleSoft, Azure API Management)
Middleware / ESB

Experiencia en mensajería:

Kafka
RabbitMQ
IBM MQ o similares

Conocimiento bancario: Imprescindible tener conocimientos bancarios.

Entendimiento de:

Core banking
Operativa de cuentas
Productos financieros (activo y pasivo)

Regulación:

PSD2 / Open Banking
Seguridad en APIs
Exposición de servicios regulados

¿Qué te ofrecemos?

Bienestar y beneficios personales

Wellbeing HUB EY, con programas de salud física (Wellhub) y bienestar mental.
Seguro de Vida y Accidentes.
Plan EY Flex de compensación flexible: transporte, formación, tarjeta restaurante, guardería, entre otros.
Oficina Bankinter con condiciones especiales para profesionales EY.

Flexibilidad y conciliación

Modelo de trabajo híbrido, con flexibilidad según proyecto y equipo.

Desarollo profesional

EY University: formación continua con itinerario individualizado (más de 100 horas al año)
Plan de carrera definido, con revisiones anuales y oportunidades de crecimiento real.
Acompañamiento desde el primer día gracias a las figuras de:

Buddy para tu integración.
Counselor para tu desarrollo profesional durante toda tu trayectoria.

Cultura y entorno de trabajo

Entorno dinámico, colaborativo e inclusivo.
Oportunidad de trabajar con equipos globales y multidisciplinares.
Ampliación constante de tu red profesional en una firma líder.

Compromiso social

Participación en iniciativas de compromiso social a través de la Fundación EY y de programas propios de Impacto Social en España.
Compromiso real con la sostenibilidad, la diversidad y la responsabilidad corporativa.

#LI-HYBRID