Java Backend Engineer

Citibank (Switzerland) AG; Mississauga; Hybrid; Confidential; Full time

Job summary

Citi in Mississauga, Canada, is seeking an intermediate Java Backend Engineer to participate in building scalable, secure, microservices-based backends using Java, Spring Boot, Kafka, and containers.

You will design and develop RESTful services, optimize APIs, work with Oracle, MongoDB, MSSQL, and collaborate with architects, DevOps, QA, and business teams within an Agile SDLC.

Qualifications

• 5+ years of design, development, testing and deployment of high-quality code.
• 3+ years in Core Java (Java 8+), OOP, collections, concurrency, and multithreading.
• 3+ years with Spring Boot, REST services, microservices architecture.

Responsibilities

• Design, develop, and maintain Java/Spring Boot applications and RESTful microservices.
• Build scalable backend components with performance, reliability, and clean architecture.
• Develop and optimize APIs, backend logic, and integrations with internal/external systems.

Skills

Core Java

Spring Boot

REST microservices

Microservices architecture

Database concepts

Kafka

Docker

Kubernetes

Git CI/CD

OOP/multithreading

Education

Bachelor’s degree in Computer Engineering/CS/IS

Tools

Docker

Kubernetes

Git/GitHub/GitLab

Maven/Gradle

Job description

About the Role

The Java Backend Engineer is an intermediate level position responsible for participation in the establishment and implementation of new or revised application systems and programs in coordination with the Technology team. The overall objective of this role is to contribute to applications systems analysis and programming activities. We are seeking a highly skilled Java Developer with strong expertise in building scalable, secure, and high‑performance backend systems. You will work closely with architects, leads, DevOps, QA, and business teams to deliver modern microservices‑based solutions using Java, Spring Boot, Kafka, containers, and multiple databases.

Key Responsibilities

• Design, develop, and maintain Java/Spring Boot applications and RESTful microservices.
• Build scalable backend components with strong focus on performance, reliability, and clean architecture.
• Develop and optimize APIs, backend logic, and integrations with internal/external systems.
• Work with Oracle, MongoDB, MSSQL databases; Containerize and deploy applications using Docker and Kubernetes.
• Write clean, testable, well‑documented code and perform code reviews to maintain coding standards.
• Develop automated unit/integration tests using JUnit and REST testing frameworks.
• Troubleshoot and resolve issues across development, testing, and production environments.
• Collaborate with cross‑functional teams and participate in Agile ceremonies throughout the SDLC.
• Continuously improve application performance, development processes, and automation maturity.

Qualifications:

• 5+ years relevant experience in Design, development, testing and deployment of high quality code.
• 3+ years’ experience and expertise in Core Java (Java 8+), OOPs, collections, concurrency, and multithreading.
• 3+ years of hands‑on experience with Spring Boot, REST services, microservices architecture.
• 3+ years’ experience with Database skills: Oracle, MongoDB, MSSQL.
• Good to have Messaging systems: Kafka (producers, consumers, topics, streaming).
• Experience with Docker, Kubernetes, and containerized deployments.
• Strong knowledge of JSON, XML, serialization, annotations, caching, and distributed computing concepts.
• Experience with Git/Bitbucket/GitHub, Maven/Gradle, CI/CD pipelines.
• Education: Bachelor’s degree/University degree in Computer Engineering, Computer Science, Information systems or equivalent experience.

This job description provides a high-level review of the types of work performed. Other job-related duties may be assigned as required.

Job Family Group: Technology

Job Family: Applications Development

Time Type: Full time

Primary Location Full Time Salary Range: $94,300.00 - $141,500.00

Most Relevant Skills Please see the requirements listed above.

Other Relevant Skills Back-End Development, Java, Spring Boot, Structured Query Language (SQL).

Automated Processing and AI We use automated processing, including artificial intelligence, for our legitimate business interests (or our reasonable and appropriate business purposes) to identify and align the candidate's skills and abilities with a specific job opening. Additionally, if you so choose, or consent, we can match your skills and abilities to other suitable roles at Citi. Importantly, all our hiring processes and decisions, including determining your suitability for a role, are conducted, checked, and decided by individuals. Our automated processing and AI do not involve relying on automatic or autonomous decision-making. Please refer to any Jurisdictional Considerations, with specific provisions for your country (where relevant) for further details.

This job opening is for an existing job vacancy.

Citi is an equal opportunity employer, and qualified candidates will receive consideration without regard to their race, color, religion, sex, sexual orientation, gender identity, national origin, disability, status as a protected veteran, or any other characteristic protected by law. If you are a person with a disability and need a reasonable accommodation to use our search tools and/or apply for a career opportunity review Accessibility at Citi. View Citi’s EEO Policy Statement and the Know Your Rights poster.