java backend engineer jobs in Toronto

Join Agentic AI as a Lead Java Engineer, focusing on edge computing and AI/ML systems in Toronto. Leverage your Java expertise to architect and build scalable distributed platforms. In this full-time contract role, you will lead the design and development of innovative backend services using Java and Spring Boot. Your leadership will guide engineering teams...

Build high-throughput streaming systems as a Senior Java Engineer specializing in Apache Flink, working hybrid from downtown Toronto three days weekly. This senior backend engineering role supports the Core Data Platform team in evolving real-time data architecture. You will develop stateful pipelines with Java DataStream and Table/SQL APIs, integrate...

Build reliable AI infrastructure with Python and distributed systems at Lydia AI, working hybrid in Toronto to advance ORCA's platform. As a Senior Backend and AI Platform Engineer, you will improve ORCA's execution architecture and establish AI-native engineering practices. You will design backend services, APIs, asynchronous workflows, and secure...

Transform enterprise-scale projects as a Senior Backend Engineer with Raise in Toronto, ON, leveraging a hybrid work environment. Bring your expertise to cloud-native solutions and technical leadership. This role requires a seasoned professional with a strong background in technology and architecture. You will support modernization efforts, mentor...

~5+ years building and operating production REST APIs in Node.js & TypeScript ~ Hands-on AWS serverless experience — Lambda, API Gateway, DynamoDB, S3, CloudWatch, IAM, SNS, SQS, Glue, ECS — built and run in production, not just in tutorials ~ Strong REST API design skills — resource modeling, semantics, versioning, idempotency, and...

Affrim is seeking a Staff Software Engineer to lead Observability. You’ll own the architecture of our telemetry pipeline, balancing reliability, performance, and cost for 200+ TB/day. You’ll design log-sampling strategies to reduce volume while preserving signal during incidents. You’ll shape how observability fits into agentic development, mentor a...

Senior Staff Software Engineer, Backend (Compute Platform) Remote Canada At Affim, we exist for the moments that matter—giving people a clear, predictable way to pay over time, with no hidden fees, no surprises, and no tradeoffs on what matters most. Affirm's engineering team is building a large-scale, highly-available, and global infrastructure that is...

Kaseya is hiring a Senior Backend Engineer (SaaS, Data & AI) in the Toronto area. You will lead backend design, APIs, and data/ML integration for multi-tenant SaaS platforms, partnering with Product, Design, and Data teams to drive scalable, high-impact features. The role emphasizes hands-on development, system reliability, and mentoring engineers while...

Use Java, Spring Boot, and React to deliver modern digital solutions from Miratech’s downtown Toronto office two days weekly. Solve enterprise challenges across front end and back end. This Senior Full Stack Developer position suits an engineer comfortable designing interfaces, services, APIs, databases, and cloud deployments. You will translate business...

Develop Curinos fintech software from the Toronto HUB or remotely, combining Java Spring Boot, Angular, Databricks, and AWS. Curinos is seeking a Senior Software Engineer for B2B SaaS applications serving financial institutions. This hybrid-modality role is open to remote or hybrid candidates commutable to Toronto. You will build customer-focused pricing and...

Build Java cloud services with strong DevOps expertise at Thomson Reuters in Toronto, using AWS, Spring Boot, and PostgreSQL within a hybrid model. As a Senior Software Engineer, you will design, deploy, and operate scalable cloud-native services. You will own solutions across delivery and production operations while improving reliability, deployment...

About Plooto Plooto is a Canada-born fintech company on a mission to give small and mid-sized businesses the financial power to succeed on their own terms. We make payments secure, accurate, and stress-free so businesses and their accountants can spend less time in the books, confidently manage cash flow, and make smarter decisions every day. We’re a team...

About Feathery Feathery is the AI Operating & Decisioning system for financial services. Our customers — including Fortune 500s like Allstate — use Feathery to power mission-critical workflows such as customer onboarding, insurance underwriting and quoting, account openings, and advisor transitions. Why We’re Hiring As Feathery grows, so does the...

Elevate your career as a Senior Software Engineer with Mozilla, focusing on backend systems for Firefox and enhancing cloud infrastructure in a collaborative environment. The Mozilla Corporation seeks an experienced engineer to join the Ecosystem Services Team. This role requires strong expertise in backend technologies, collaborating with product managers...

Earn Up To $50/hr as an OpenClaw Agent Builder Shape the future of autonomous agents like OpenClaw. Freelance, remote, up to $50 USD/hr. Weekly payments. Trusted by 10,000+ software engineers worldwide MIN EXP REQUIRED 2+ years PAY RATE Up to $50 USD/hr Earn Up To $50 USD/hr— Plus Additional Incentives Rates vary based on expertise and project...

Excel as a Staff Backend Software Engineer at Motion, focusing on API design and backend services. Use your skills in Node, TypeScript, and MongoDB to influence company-wide operations. Join Motion's Platform team to develop and enhance high-quality backend solutions that cater to diverse product lines. You will collaborate closely with engineers to deliver...

Transform the fintech landscape as a Senior Backend Engineer at a leading firm in Downtown Toronto. This hybrid position emphasizes building scalable backend systems for investment and risk management. In this role, you'll engage with diverse teams to design high-performance solutions that streamline financial data workflows and support complex datasets...

At Cognichip, we are building AI-native tools that transform how semiconductor engineers create, verify, and optimize chips. Our platform combines large proprietary models, agentic workflows, domain-specific engineering intelligence, and high-performance simulation infrastructure to accelerate one of the world’s most complex engineering disciplines. ...

Take on a vital role as a Senior Python Backend Engineer focusing on API and platform engineering in Toronto, Ontario. Develop scalable backend solutions for mission-critical financial platforms. This on-site position is suited for candidates with 5-10+ years of strong Python backend development experience. You will design and implement backend services...

Your Role As a Software Engineer you will be responsible for building Zip's core products and architecture. You will ship features that will be immediately used by our users, and will work with a tight‐knit team that values open communication and cross‐functional collaboration. We move quickly to solve a wide range of complex technical and product...