Senior Java Backend Architect | Cloud-Native Microservices

Citigroup Inc.; Mississauga; On-site; CAD 133,000 - 200,000; Full time

Job summary

Citigroup Inc. is seeking a seasoned Senior Java Back-End Developer to lead end-to-end technical design and delivery of mission-critical systems.

You will own architecture decisions, mentor senior engineers, and partner with product, security, and platform teams to build scalable, reliable, and secure distributed systems. The role emphasizes hands-on development with Java 17+, Spring Boot, REST/GraphQL, and event streaming, along with cloud & platform design across AWS/Azure/GCP and Kubernetes.

Qualifications

• 5+ years of progressive experience building enterprise systems with 5+ years in Java and Spring at scale.
• Proven delivery of cloud-native, microservices, and event-driven architectures.
• Strong expertise in Java 11/17+, Spring Boot, Spring Cloud, REST/GraphQL APIs, Kafka, Kubernetes, Docker.

Responsibilities

• Define and evolve system architecture for cloud-native, microservices/event-driven platforms.
• Lead design reviews and ensure alignment with domain-driven design and 12-factor principles.
• Lead squads through full SDLC from discovery to production and SRE handoff.

Skills

Java

Spring Framework

Cloud-native architectures

Microservices

Event-driven architectures

REST APIs

GraphQL

Kubernetes

Docker

Kafka/Pulsar

CI/CD

IaC

Observability

DDD & 12-factor

Education

Bachelor's degree

Tools

Terraform

Azure DevOps

GitHub Actions

Jenkins

ARM templates

Job description

Citigroup Inc. is seeking a seasoned Senior Java Back-End Developer to lead end-to-end technical design and delivery of mission-critical systems.

You will own architecture decisions, mentor senior engineers, and partner with product, security, and platform teams to build scalable, reliable, and secure distributed systems. The role emphasizes hands-on development with Java 17+, Spring Boot, REST/GraphQL, and event streaming, along with cloud & platform design across AWS/Azure/GCP and Kubernetes.