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Sr. Java Kotlin Engineer (Hybrid)(Toronto, ON)

Sr. Java Kotlin Engineer (Hybrid)(Toronto, ON)

Hybrid

Toronto, Canada

Senior

Freelance

05-02-2026

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Skills

Leadership Java Kotlin TypeScript MongoDB PostgreSQL GraphQL GitHub CI/CD DevOps Docker Kubernetes Jenkins Scrum Architecture Programming Databases angular react node.js AWS Agile Junit Spring Redux GCP Redis Spring Boot Gradle CI/CD Pipelines Microservices GitHub Actions

Job Specifications

Title: Sr. Java Kotlin Engineer

Location: Toronto, ON(Hybrid - 3 days a week)

Duration: 6+ months

Highly skilled software engineer with 7+ years of experience in designing, developing, and deploying scalable applications using Kotlin and Java Adept at building robust backend services and dynamic front-end interfaces, with a strong emphasis on clean architecture, performance optimization, and maintainability. Proven ability to work in Agile environments, collaborate with cross-functional teams, and deliver high-quality solutions aligned with business goals.

Core Skills

Languages & Frameworks: Kotlin (Spring Boot, Ktor), TypeScript (React, Angular, Node.js)
Architecture: Microservices, RESTful APIs, Event-driven systems
Tools & Platforms: Docker, Kubernetes, AWS/GCP, Gradle, Webpack
Testing: JUnit, Jest, Cypress, Mockito
Practices: CI/CD, TDD, SOLID principles, Clean Code
Databases: PostgreSQL, MongoDB, Redis

Experience Highlights

Backend Development (Kotlin):

Designed and implemented microservices using Spring Boot and Ktor, ensuring high availability and scalability.
Integrated RESTful APIs and GraphQL endpoints for seamless data exchange.
Optimized application performance by leveraging coroutines and asynchronous programming in Kotlin.

Frontend Development (TypeScript):

Built responsive and interactive web applications using React and Angular.
Implemented state management with Redux and RxJS for complex UI workflows.
Developed reusable UI components and ensured cross-browser compatibility.

DevOps & Cloud:

Automated deployments using CI/CD pipelines (Jenkins, GitHub Actions).
Containerized applications with Docker and orchestrated using Kubernetes.
Deployed and monitored services on AWS/GCP, ensuring cost optimization and reliability.

Collaboration & Leadership:

Mentored junior developers on Kotlin and TypeScript best practices.
Participated in code reviews, ensuring adherence to coding standards and security guidelines.
Worked closely with product owners and QA teams in Agile/Scrum environments.

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About the Company

TestingXperts (Tx) is a leading provider of Digital Assurance and Quality Engineering services and solutions globally, with a dedicated division specializing in Digital Engineering. Recognized amongst the three largest pure-play quality engineering services companies worldwide, Tx is partnered with a plethora of Forbes Global 2000 & Fortune 500 companies. With our headquarters strategically located in Pennsylvania, USA, and London, UK, we maintain a dynamic network of offices and delivery centers across the US, UK, Canada, ... Know more