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Freelance Java Back End Developer Jobs in Toronto, ON

Job Overview We are seeking a Back-End Developer with deep expertise in Oracle PL/SQL and experience in Java-based REST API development . This role will focus primarily on database development with ...

The Senior Back-End Developer is responsible for designing, building, and maintaining high-performance server-side systems that power a large-scale video platform serving millions of users. This role ...

PL/SQL & API Developer

Toronto, ON · On-site

CA$70K - CA$115K/yr

Job Overview We are seeking a Back-End Developer with deep expertise in Oracle PL/SQL and experience in Java-based REST API development . This role will focus primarily on database development with ...

The Sr. Consultant, Back End Developer provides technical leadership to develop precise steps and ... Java, Spring Boot, RDBMS/SQL, Micro-servicesarchitecture, J2EE, SOAP Services, REST APIs, gRPC ...

The Sr. Consultant, Back End Developer provides technical leadership to develop precise steps and ... Java, Spring Boot, RDBMS/SQL, Micro-servicesarchitecture, J2EE, SOAP Services, REST APIs, gRPC ...

The Sr. Consultant, Back End Developer provides technical leadership to develop precise steps and ... Microservices architecture, Java/J2EE, SOAP, REST and gRPC Services, Quarkus, Spring Boot, JSON ...

The Sr. Consultant, Back End Developer provides technical leadership to develop precise steps and ... Microservices architecture, Java/J2EE, SOAP, REST and gRPC Services, Quarkus, Spring Boot, JSON ...

Senior Backend Developer

Toronto, ON · Hybrid

CA$100K - CA$140K/yr

The ideal candidate combines strong backend and frontend engineering skills with experience in distributed systems, integrations, and scalable architectures . JavaScript, TypeScript, Node.js, and ...

... and Back end like Angular Node Js Core Java Spring Spring boot REST API etc Should have 6 to 8 ... DevOps tools like Jenkins Should have working experience or sound knowledge in PCF OCP Should have ...

Senior Back-End Developer (Toronto)

Toronto, ON · On-site

CA$150K - CA$180K/yr

About the Role You will be responsible for developing and maintaining our Backend services. You will code with other developers in expanding our product offering using Node and GraphQL, deployed on ...

Staff Backend Engineer (SaaS, Data & AI) Why Kaseya? Join a fast-growing company that ... Experience building APIs and backend services using technologies such as Node.js, Java, Go, Rust ...

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Freelance Java Back End Developer information

What are the key skills and qualifications needed to thrive as a Freelance Java Back End Developer, and why are they important?

To thrive as a Freelance Java Back End Developer, you need strong proficiency in Java, object-oriented programming, RESTful API design, and experience with frameworks like Spring or Hibernate, typically supported by a relevant degree or proven project portfolio. Familiarity with version control systems (such as Git), build tools (like Maven or Gradle), cloud platforms, and continuous integration/continuous deployment (CI/CD) pipelines is highly valued. Outstanding problem-solving abilities, self-motivation, and effective client communication set top freelancers apart. These skills ensure you can deliver robust, maintainable solutions independently and build lasting client relationships.

What are some common challenges faced by Freelance Java Back End Developers when working with multiple clients simultaneously?

Freelance Java Back End Developers often juggle several projects at once, which can present challenges in time management, prioritizing tasks, and aligning with different client expectations. Each client may use distinct tech stacks, communication tools, and development processes, requiring adaptability and strong organizational skills. Clear communication, setting realistic deadlines, and using project management tools can help freelancers maintain quality and meet deliverables across diverse projects.

What does a Freelance Java Back End Developer do?

A Freelance Java Back End Developer is a software professional who specializes in building and maintaining the server-side logic of web applications using the Java programming language. They work independently on a contract basis for various clients, handling tasks such as developing APIs, managing databases, and ensuring the performance and security of the application’s back end. Their responsibilities often include collaborating with front-end developers, integrating third-party services, and troubleshooting server-side issues. Freelancers in this role can work remotely or onsite, offering flexibility to both clients and developers.

What is the difference between Freelance Java Back End Developer vs Freelance Java Software Engineer?

AspectFreelance Java Back End DeveloperFreelance Java Software Engineer
CredentialsJava certifications, experience in backend frameworksJava certifications, broader software development skills
Work EnvironmentRemote, project-based, client-specificRemote or on-site, project or product-focused
Industry UsagePrimarily in backend development projectsInvolved in full software development lifecycle
Search & Comparison IntentFocus on backend Java skillsBroader software development expertise

While both roles involve Java skills, a Freelance Java Back End Developer specializes in server-side development, focusing on backend systems. A Freelance Java Software Engineer may have a broader scope, including full-stack or application development, often requiring additional skills beyond backend work.

What are the most commonly searched types of Java Back End Developer jobs in Toronto, ON? The most popular types of Java Back End Developer jobs in Toronto, ON are:
What are popular job titles related to Freelance Java Back End Developer jobs in Toronto, ON? For Freelance Java Back End Developer jobs in Toronto, ON, the most frequently searched job titles are:
What job categories do people searching Freelance Java Back End Developer jobs in Toronto, ON look for? The top searched job categories for Freelance Java Back End Developer jobs in Toronto, ON are:
Infographic showing various Freelance Java Back End Developer job openings in Toronto, ON as of May 2026, with employment types broken down into 58% Full Time, and 42% Contract. Highlights an 78% In-person, and 22% Remote job distribution.
PL/SQL & API Developer

PL/SQL & API Developer

CMiC

Toronto, ON

CA$70K - CA$115K/yr

Full-time

Medical, Dental, PTO

Posted 18 days ago


Job description

About CMiC

Headquartered in Toronto, CMiC is a software company focused on the Construction industry. We have built a comprehensive platform for construction companies to manage their most important workflows. Our customers have their choice of a SaaS or Private Hosted platform that includes industry focused modules to manage everything from Financials and Payroll to Project Management and Budgeting. Our market share is very strong in North America and rapidly expanding internationally in regions like Europe, Southeast Asia and the Middle East.

Job Overview

We are seeking a Back-End Developer with deep expertise in Oracle PL/SQL and experience in Java-based REST API development. This role will focus primarily on database development with additional responsibilities in API development and integration. Strong analytical thinking and problem-solving skills are essential to succeed in this role.

Important Information:

  • The overall hiring salary range for this position from Intermediate to Senior level, is $70,000 to $115,000 annually
  • This position is for an existing vacancy
  • We do not use AI to screen, assess, or select applicants

Duties & Responsibilities

Oracle / PL-SQL

  • Advanced PL/SQL development (packages, procedures, functions, triggers)
  • Strong SQL skills (complex joins, subqueries, performance tuning)
  • Query optimization and execution plan analysis
  • Data modeling (normalized/denormalized schemas)
  • Bulk processing and efficient data handling techniques
  • Use of Oracle development tools (PL-SQL Developer, TOAD, SQL*Plus)
  • Error handling, exception management, and logging
  • Working with large datasets and high-volume transactional systems

API Development

  • Object oriented programming
  • Java programming
  • RESTful API design and implementation
  • Java backend development (Java 8+ preferred)
  • Spring / Spring Boot framework (Nice to have)
  • API documentation (Swagger/OpenAPI)
  • JSON/XML data handling
  • Secure API development (OAuth2, JWT, basic authentication)

Nice to Have

  • IntelliJ experience
  • Oracle JDeveloper experience
  • CI/CD pipelines (Jenkins, GitHub Actions)
  • Database design principles and data architecture
  • Transaction management and concurrency control
  • API lifecycle management and versioning strategies
  • Software development lifecycle (SDLC)
  • Secure coding practices
  • Data integrity and validation techniques
  • Version control systems (Git)

Requirements

  • 3-7+ years in backend development
  • Significant hands-on experience with Oracle database development
  • Proven experience developing and maintaining PL/SQL code in enterprise environments
  • Experience building and consuming REST APIs in Java
  • Exposure to system integration across multiple applications
  • Experience in performance tuning and troubleshooting production issues
  • Working in Agile/Scrum environments

Analytical Skills

  • Strong problem-solving and root-cause analysis abilities
  • Ability to analyze complex data flows and system dependencies
  • Debugging and troubleshooting complex database and API issues
  • Translating business requirements into efficient technical solutions
  • Identifying performance bottlenecks and optimizing solutions
  • Data-driven decision-making mindset

Attitudes and Aptitudes

  • Detail-oriented, especially with data accuracy and integrity
  • Ownership mindset with accountability for deliverables
  • Continuous learning (especially evolving database and API technologies)
  • Proactive in identifying issues and proposing improvements
  • Collaborative team player with good communication skills
  • Adaptable to changing priorities and requirements
  • Quality-focused with emphasis on maintainability and scalability
  • Logical reasoning and structured thinking
  • Strong attention to detail (critical for database work)
  • Ability to work with abstract data models and complex logic
  • Capability to manage both deep backend processing and API layers

Benefits

  • Competitive benefits Package (including Health & Dental benefits)
  • Paid vacation and personal days
  • Townhall meetings where all employees are encouraged to participate in open discussions
  • Located on York University's campus, easily accessible by transit (TTC, GO, etc.), walking distance to shopping and restaurants
  • Outdoor lunch space, including picnic tables
  • An active Social Events Committee (past events include annual seasonal parties, pool and bowling tournaments, karaoke nights, Game nights, BBQ's, and more)
  • Health and Wellness focus including virtual yoga classes and wellness webinars
  • RRSP Matching Program after 2 years of employment
  • Experience in a rapidly growing, socially responsible corporation

CMiC is an Equal Opportunity Employer. In accordance with the Accessibility for Ontarians with Disabilities Act, 2005 and the Ontario Human Rights Code, CMiC will provide accommodation to applicants with disabilities throughout the recruitment, selection and/or assessment process. If selected to participate in the recruitment, selection and/or assessment process, please inform Human Resources staff of the nature of any accommodation(s) that you may require.