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Freelance Java Back End Developer Jobs in Toronto, ON

Capgemini

Java Full-stack Developer

Mississauga, ON · On-site

CA$86K - CA$127K/yr

The candidate must have Java backend development experience with Core Java Java EE Springboot ... engineering, all fueled by its market leading capabilities in AI, generative AI, cloud and data ...

Capgemini

Java Full-stack Developer

Mississauga, ON · On-site

CA$86K - CA$127K/yr

The candidate must have Java backend development experience with Core Java Java EE Springboot ... engineering, all fueled by its market leading capabilities in AI, generative AI, cloud and data ...

Virtusa

Senior Java Developer

Mississauga, ON

The ideal candidate will have deep expertise in Java and modern backend / frontend technologies, a strong understanding of system design, and the ability to mentor junior engineers while ...

Capco

Staff Java Engineer (Backend)

Toronto, ON · On-site

What You'll Do * Design and build scalable backend applications using Java, Spring Boot ... developer productivity and software quality. Bonus Points For * Experience with domain-driven ...

Virtusa

Senior Java Developer

Mississauga, ON

The ideal candidate will have deep expertise in Java and modern backend / frontend technologies, a strong understanding of system design, and the ability to mentor junior engineers while ...

Virtusa

Senior Java Developer

Mississauga, ON

The ideal candidate will have deep expertise in Java and modern backend / frontend technologies, a strong understanding of system design, and the ability to mentor junior engineers while ...

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Freelance Java Back End Developer information

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 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 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:

Freelance Java Back End Developer jobs near you
Infographic showing various Freelance Java Back End Developer job openings in Toronto, ON as of August 2026, with employment types broken down into 58% Full Time, and 42% Contract. Highlights an 100% In-person job distribution.

Senior Backend Developer- .NET

Charger Logistics Inc

Brampton, ON

Full-time

Medical

Posted 20 days ago

Job description

Charger logistics Inc. is a world- class asset-based carrier with locations across North America. With over 20 years of experience providing the best logistics solutions, Charger logistics has transformed into a world-class transport provider and continue to grow.

We are seeking a skilled and performance-minded .Net Core Developer to support and evolve our distributed system of over 100 microservices, built primarily with .NET Core and PostgreSQL. The ideal candidate has deep experience in backend development, service-to-service communication, and infrastructure-level tools like service mesh, and observability platforms. You will work closely with DevOps, QA, and frontend teams to ensure high availability, scalability, and maintainability of our services.

Responsibilities:

  • Design, develop, and optimize high-performance backend microservices using .NET Core/C#.
  • Implement distributed tracing, logging, and metrics for observability using tools like OpenTelemetry, Prometheus, and Grafana.
  • Optimize service-to-service communication and database access to reduce latency and improve throughput.
  • Write scalable SQL queries and optimize PostgreSQL usage, indexing, and connection handling.
  • Contribute to service discovery, dynamic routing, and rollout strategies (e.g., blue/green, canary).
  • Collaborate with QA to improve testability and traceability in a distributed system.
  • Participate in architecture reviews and contribute to best practices for microservices at scale.
  • Maintain CI/CD integration pipelines and ensure backend services deploy reliably.
  • Troubleshoot and debug production issues using logs, traces, metrics, and profiling tools.

Requirements

  • 7+ years of backend development experience, including 2+ years in a microservices environment.
  • Strong hands-on experience with .NET Core (C#) and PostgreSQL.
  • Experience with distributed tracing, metrics, and log aggregation tools (e.g., Jaeger, Prometheus, Loki, Grafana).
  • Deep understanding of REST, gRPC, and asynchronous messaging patterns (e.g., Kafka, RabbitMQ).
  • Familiarity with Kubernetes, Docker, and container-based deployments.
  • Understanding of software performance profiling, benchmarking, and optimization.
  • Strong grasp of service resilience patterns: timeouts, retries, bulkheads, circuit breakers.
  • Excellent problem-solving and debugging skills in large-scale systems.

Preferred Qualifications

  • Experience working with Istio, Consul, or another service mesh.
  • Familiarity with Event Sourcing, CQRS, and DDD patterns.
  • Exposure to Infrastructure as Code tools (Terraform, Helm).
  • Experience with other databases like Redis, MongoDB, or TimescaleDB.
  • Knowledge of cloud platforms like AWS, Azure, or GCP.

Benefits

  • Competitive Salary
  • Healthcare Benefit Package
  • Career Growth

Apply