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Backend Engineer Java Jobs in Ajax, ON (NOW HIRING)

YO AI Labs

Backend Engineer - Remote

Toronto, ON · Remote

$80 - $120/hr

Senior Software Engineer Job Type: Contractor (~15 hours/week) Location: Remote Job Summary We are ... Strong proficiency in Python 3, Java, Rust, C++, or TypeScript . * Strong understanding of ...

Kaseya Careers

Sr. Software Engineer

Toronto, ON · On-site

Senior Backend Engineer (SaaS, Data & AI) Why Kaseya? Join a fast-growing company that ... Experience with backend languages such as Node.js, Java, Go, or similar * Experience with Python ...

Localcoin

Senior Java Developer

Etobicoke, ON · Hybrid

CA$120K - CA$140K/yr

As a Senior Java Back-End Developer at Localcoin, you will be responsible for developing and maintaining functional and stable back end applications for our company, ensuring system consistency and ...

Okta

Staff Backend Engineer, Passwordless

Toronto, ON · Hybrid

The Staff Software Engineer Opportunity Passkeys, powered by FIDO2 WebAuthn, are revolutionizing ... Deep expertise in Java, including a strong understanding of object-oriented design, multithreading ...

Priceline.com LLC

Associate Java Developer

Toronto, ON · Hybrid

CA$85K - CA$100K/yr

Associate Software Engineer - Java This role is eligible for our hybrid work model: Two days in ... We design and develop our back end systems and REST APIs that serve hundreds of millions of ...

Priceline

Associate Java Developer

Toronto, ON · Hybrid

CA$85K - CA$100K/yr

Associate Software Engineer - Java This role is eligible for our hybrid work model: Two days in ... We design and develop our back end systems and REST APIs that serve hundreds of millions of ...

Rumble - Career Page

Senior Back-End Developer

Toronto, ON · On-site

CA$135K - CA$154K/yr

Rumble is seeking a Senior Back-End Developer to design, build, and maintain high-performance server-side systems that power a large-scale video platform serving millions of users. This is a senior ...

PPT

Senior Back-End Developer

Toronto, ON · Remote

NET Backend Developer to join our backend team. In this role, you will be responsible for designing, developing, and maintaining robust and scalable backend systems using .NET technologies . The ...

New

Atyeti Inc

Sr Java developer

Toronto, ON · On-site

A Java Developer designs, develops, tests, and maintains scalable Java-based applications (web ... Build new and enhance existing Java applications, including back-end services, APIs (RESTful), and ...

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Backend Engineer Java information

What does a backend engineer Java do?

A Backend Engineer Java is responsible for developing and maintaining the server-side logic, databases, and application programming interfaces (APIs) using the Java programming language. They ensure that the backend of web applications or software systems is efficient, secure, and scalable. Their work often involves collaborating with frontend developers, designing system architecture, and optimizing performance to handle large volumes of user requests. Backend Java engineers often use frameworks such as Spring or Hibernate and work with databases like MySQL or PostgreSQL.

What are the key skills and qualifications needed to thrive as a backend engineer Java?

To thrive as a Backend Engineer Java, you need a solid understanding of Java programming, data structures, algorithms, and experience with backend frameworks, typically supported by a relevant degree or industry experience. Familiarity with tools and technologies such as Spring Boot, RESTful APIs, relational databases, and build systems like Maven or Gradle is commonly required. Problem-solving ability, teamwork, and effective communication are crucial soft skills for excelling in collaborative and fast-paced development environments. These combined skills ensure robust, scalable backend systems that meet business needs and integrate smoothly within larger software architectures.

How does a backend engineer Java typically collaborate with frontend developers and other stakeholders in a project?

As a Backend Engineer Java, you will regularly collaborate with frontend developers to ensure seamless integration between server-side logic and user interfaces. This often involves participating in design discussions, clarifying API requirements, and troubleshooting integration issues. You’ll also engage with product managers, QA engineers, and sometimes DevOps teams to align on project goals, timelines, and deployment strategies. Effective communication is key to translating business requirements into reliable backend solutions and maintaining smooth workflows across the team.

What is the difference between Backend Engineer Java vs Backend Developer Java?

AspectBackend Engineer JavaBackend Developer Java
Primary FocusDesigning, developing, and maintaining server-side applications and systemsImplementing and coding backend functionalities based on specifications
ResponsibilitiesSystem architecture, performance optimization, API developmentWriting code, debugging, integrating databases
Skills & CertificationsJava, Spring, REST APIs, SQL, cloud platformsJava, Spring, SQL, version control, testing tools
Work EnvironmentCollaborative teams, project planning, architecture designCode implementation, debugging, feature development

Both roles require Java expertise and similar certifications, but Backend Engineer Java typically involves higher-level system design and architecture responsibilities, while Backend Developer Java focuses more on coding and implementing features. Employers often see these roles as complementary within software development teams.

What are popular job titles related to Backend Engineer Java jobs in Ajax, ON?

For Backend Engineer Java jobs in Ajax, ON, the most frequently searched job titles are:

What cities near Ajax, ON are hiring for Backend Engineer Java jobs?

Cities near Ajax, ON with the most Backend Engineer Java job openings:

Backend Engineer Java jobs near you
Infographic showing various Backend Engineer Java job openings in Ajax, ON as of August 2026, with employment types broken down into 87% Full Time, 8% Part Time, and 5% Contract. Highlights an 83% Physical, 5% Hybrid, and 12% Remote job distribution.

Backend Engineer - Remote

YO AI Labs

Toronto, ON • Remote

$80 - $120/hr

Full-time

Posted 11 days ago

Job description

Senior Software Engineer

Job Type: Contractor (~15 hours/week)
Location: Remote

Job Summary

We are seeking experienced Senior Software Engineers to support an AI training project by creating reinforcement learning environments that evaluate AI models on complex software engineering tasks using Model Context Protocol (MCP) tools.

You will design reproducible environments, deterministic verification, and reference solutions for tasks such as bug fixing, feature implementation, codebase refactoring, and performance optimization. No prior AI experience is required.

Key Responsibilities
  • Create reinforcement learning environments for software engineering tasks.
  • Design tasks involving bug fixing, feature development, refactoring, and performance optimization.
  • Build deterministic verification systems and golden reference solutions.
  • Evaluate AI agents' ability to reason through complex codebases and use MCP tools effectively.
  • Develop realistic, reproducible software engineering scenarios.
  • Ensure tasks accurately measure coding ability, problem-solving, and tool usage.
  • Document solutions and provide clear technical feedback.
Required Skills
  • Strong proficiency in Python 3, Java, Rust, C++, or TypeScript.
  • Strong understanding of algorithms and data structures.
  • Experience with bug fixing and debugging complex software issues.
  • Proven experience in feature implementation and codebase refactoring.
  • Strong knowledge of performance optimization and tuning.
  • Excellent written and verbal communication.
  • Strong attention to detail.
Preferred Qualifications
  • Experience working with large-scale or distributed codebases.
  • Familiarity with AI/ML systems is a plus but not required.
  • Experience with rigorous code reviews and software engineering best practices.
  • Experience working effectively in remote or cross-functional teams.
Hiring Process
  1. Submit an application and screening questions.
  2. Complete an AI interview (~30 minutes).
  3. Complete a technical assessment, if required.
  4. Hiring Manager review.
Compensation

Compensation is output-based, with payment provided per task that meets project specifications. Minimum weekly submission requirements may apply.

Availability

Selected experts should be prepared to begin their first tasks within 24–48 hours of completing onboarding.