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Apptoza Inc.

Java Developer

Toronto, ON, Canada

Contract

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Job details

Job type: Contract
Apply by: Nov 26, 2026
Posting language: English
Posted: Oct 27, 2026

Original job description

Job Title: Java Developer

Location: Toronto, ON

Duration: Contract

Exp Range: 9 - 12 Years --- Must Have Technical/Functional Skills

Core Development

Java (8/11/17) – strong hands on experience

Spring Boot, Spring MVC, Spring Data

Microservices architecture (service decomposition, API contracts)

REST APIs, JSON, OpenAPI / Swagger

Kafka producer, consumer, partitioning

MongoDb

Openshift / AWS

Database & Data Layer

MongoDB

o Document modeling

o Indexing strategies

o Aggregation framework

o CRUD & performance tuning

Integration & Messaging

Experience with Kafka (preferred)

REST based integrations with upstream/downstream systems

Roles & Responsibilities

Design, develop, and maintain Java based microservices

Implement RESTful APIs adhering to enterprise design standards

Develop and optimize SQL queries (E2 level) for transactional and reporting use cases

Design and manage MongoDB schemas, indexes, and queries

Ensure high availability, scalability, and performance of microservices

Apply exception handling, logging, monitoring, and resiliency patterns

Collaborate with Business Analysts, Architects, QA, and DevOps teams

Participate in code reviews, unit testing, and defect resolution

Support CI/CD pipelines, deployments, and production issues

Follow secure coding and compliance standards

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More about this job

Responsibilities

Design, develop, and maintain Java microservices and REST APIs, while optimizing SQL queries and managing MongoDB schemas, indexes, and queries. Ensure service performance, scalability, resilience, and security; collaborate across teams; and contribute to testing, code reviews, deployments, and production support.

Requirements

Requires 9–12 years of experience and strong hands-on Java experience with Spring Boot, Spring MVC, Spring Data, and microservices. Candidates should also have experience with REST APIs, Kafka, MongoDB, SQL, and OpenShift or AWS.

Skills

Java
Spring Boot
Spring MVC
Spring Data
Microservices
REST APIs
JSON
OpenAPI
Swagger
Apache Kafka
MongoDB
OpenShift
AWS
SQL
CI/CD
Secure Coding

Visa sponsorship

Not detected in the job text

Keywords

Java 8
Java 11
Java 17
Spring Boot
Spring MVC
Spring Data
Microservices Architecture
Service Decomposition
API Contracts
REST APIs
JSON
OpenAPI
Swagger
Apache Kafka
Kafka Producers
Kafka Consumers
Kafka Partitioning
MongoDB
Document Modeling
Indexing Strategies
Aggregation Framework
SQL
OpenShift
AWS
REST Integrations
High Availability
Performance Tuning
Resiliency Patterns
CI/CD
Unit Testing

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