Java Tech Lead - Cloud Native Microservices Architect

OSQuay; Lisboa, Viseu; Hybrid; EUR 90,000 - 130,000; Full time

Benefits offered by this job

Health insurance extendable to your HH

Sports benefits and partner discounts

Job summary

OSQuay in Lisbon or Viseu, Portugal is seeking a Java Tech Lead to join the Core Development Department and help design a new payments solution from scratch. You will lead backend teams, drive cloud-native microservices, and ensure security and observability.

You will mentor engineers, oversee code reviews, and collaborate with product owners to deliver scalable, high-availability systems within a hybrid work model.

Qualifications

• Degree in Computer Engineering or similar.
• Mandatory Java and cloud-native projects experience, with technical leadership.
• Advanced command of Java (recent versions) and solid experience with Spring Boot (ideally also Spring Cloud).
• Proven experience in cloud native architectures, distributed systems, microservices, and event driven patterns.
• Knowledge of containers and orchestration (Kubernetes or equivalent).
• Strong command of microservices patterns: circuit breaker, saga, retries, API gateway, service discovery, service mesh, REST, gRPC, among others.
• Hands on experience with messaging/streaming (Kafka, Pulsar, RabbitMQ, etc.).
• Knowledge of active/active topologies, geo distribution, fault tolerance, and high availability.
• Experience with distributed databases (SQL/NoSQL) and consistency models (eventual, strong, compensation).
• Solid knowledge of application and API security (OAuth2/OIDC, secrets management, hardening).
• Experience in observability (centralized logging, metrics, tracing) and SRE practices.
• Experience in payments, instant payments, or mission critical financial systems.
• Knowledge of standards such as ISO 20022 and SEPA Inst.
• Certifications in Cloud, Cloud Architecture, and/or Kubernetes (valued).
• Strong communication skills, mentoring ability, technical rigor, and a collaborative spirit.

Responsibilities

• Be the technical focal point of the project, supporting Management and Product Owners in strategic technology and roadmap decisions.
• Design, define, and evolve the cloud native architecture of the solution, based on microservices, APIs, and event driven patterns, ensuring vendor independence (cloud agnostic) and support for active/active topologies.
• Ensure alignment between development and architecture, from solution design through to production release.
• Conduct regular code reviews, promoting good engineering practices, clean code, and automated testing, ensuring the technical quality of the platform.
• Manage and prioritize technical debt, identifying critical refactors and ensuring the sustainable evolution of the product.
• Ensure non functional requirements such as performance, resilience, security, observability, and scalability.
• Support the design of high availability strategies, data consistency, and disaster recovery plans.
• Promote and maintain up to date technical documentation, including architecture, decisions, standards, and development guides.

Skills

Java

Spring Boot

Microservices architectures

MongoDB

Messaging

Geo distributed setups

Education

Degree in Computer Engineering or similar

Tools

Kubernetes

Kafka

Pulsar

RabbitMQ

OAuth2/OIDC

Job description

OSQuay in Lisbon or Viseu, Portugal is seeking a Java Tech Lead to join the Core Development Department and help design a new payments solution from scratch. You will lead backend teams, drive cloud-native microservices, and ensure security and observability.

You will mentor engineers, oversee code reviews, and collaborate with product owners to deliver scalable, high-availability systems within a hybrid work model.