Mississauga, On Senior javascript full stack developer Jobs – 101 Openings This Week

Senior Software Engineer
Guidewire Software —Toronto, ON
- $126,000–$157,000 a year
- Full-time
- Hybrid work
- Computer Science
- DevOps
- Engineering
- Dental care
- Paid time off
Software Development Manager, Generative AI
Autodesk —Toronto, ON
- $140,000–$205,700 a year
- Full-time
- Hybrid work
- JavaScript
- APIs
- AI
Senior Software Developer
SkillsWave Corporation —Toronto, ON
- Full-time
- Hybrid work
- Computer science
- Computer Science
- Engineering
Quick apply
Ionic Developer | Oakville
SearchVelocity —Oakville, ON
- Computer Science
- Engineering
- Bachelor's
- Flextime
Senior Specialist - Software Engineering
LTM —Toronto, ON
- $110,000–$130,000 a year
- On call
- Computer science
- Azure
- Computer Science
- Disability insurance
- Dental care
Quick apply
Sr Software Engineer - Core Backend & Platform Engineering
Basis —Toronto, ON
- $119,051–$160,000 a year
- Full-time
- Remote
- Java
- AWS
- JavaScript
Quick apply
RQ00580 - Sr. Full Stack Developer, Digital Experience Platform
Source Code —Toronto, ON
- Full-time
- Bilingual
- Azure
- DevOps
Quick apply
Senior Lead Software Engineer – Regulatory Reporting & Big Data
Citi —Mississauga, ON
- $120,800–$170,800 a year
- Full-time
- Hybrid work
- Management
- Computer Science
- Engineering
10h
Staff Back End Engineer (Applications)
Forma.ai —Toronto, ON
- Java
- Databases
- SQL
- Disability insurance
- Dental care
Senior Salesforce Developer
Tata Consultancy Services —Toronto, ON
- Management
- Salesforce
- JavaScript
Senior Test Developer (Automation)
SkillsWave Corporation —Toronto, ON
- Full-time
- Hybrid work
- Computer Science
- Engineering
- AWS
Quick apply
Senior Software Engineer | Remote | AI SaaS Software Role
Process Street —Toronto, ON
- Full-time
- Remote
- Java
- AWS
- JavaScript
- Dental care
- Paid time off
Quick apply
Principal Software Engineer - Platform, Identity and BI
Calabrio —Toronto, ON
- On call
- Remote
- DevOps
- Java
- SQL
- Designated paid holidays
- Disability insurance
Quick apply

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Senior Software Engineer

Guidewire Software -
Toronto, ON

Apply Now

Job details

Full-time
$126,000–$157,000 a year

Qualifications

CI/CD
Computer Science
Software Engineering
Kubernetes
DevOps
Engineering
Git
Enterprise architecture
Java
Master's degree
Microservices
AWS
Docker
C
Bachelor's
Continuous improvement
JavaScript
Software development
GitHub
APIs
SaaS
TypeScript
Communication skills
Python
Design patterns

Full job description

Canada - Toronto ; Canada - Mississauga, ON

Product Development and Operations/Full time/Hybrid

Guidewire’s Product Development and Operations (PDO) organization builds and runs the cloud platform that powers the world’s most trusted P&C insurance software. You’ll join a collaborative, agile group building high‑performance modeling and configuration services that accelerate how insurers design and deploy products. Our culture values curiosity, humility, and practical innovation in a modern cloud-native stack.

As a Senior Full‑Stack Software Engineer, you will design and build elegant, high‑impact capabilities for insurance content transformation and modeling, advancing Guidewire’s shift toward AI‑driven development and highly scalable SaaS solutions. You’ll combine deep engineering craft with AI‑native coding approaches to extend complex systems quickly and safely, helping deliver secure, reliable cloud services at scale.

Your work will directly support PDO’s mission to embed GenAI across our products and improve operational excellence, contributing to Guidewire’s broader goal of transforming how the world’s P&C insurers do business through our cloud platform that unifies digital, core, analytics, and AI.

Job Description

What you’ll do

Design, build, and maintain full‑stack capabilities for APD (Advanced Product Designer) as well as insurance content transformation that make it faster and safer for insurers to model, configure, and launch products on Guidewire systems, aligned with PDO’s AI‑ and cloud‑first priorities.

Implement robust, scalable microservices and APIs in Java on AWS, using Kubernetes and Docker to deliver secure, reliable, and cost‑efficient cloud services.

Develop intuitive, performant front‑end experiences using JavaScript/TypeScript frameworks that enable business and technical users to configure complex insurance products with confidence.

Leverage AI‑assisted development tools (such as Claude Code or Copilot) to rapidly generate, refactor, and extend code while maintaining high engineering standards, tests, and observability.

Apply enterprise architecture and software design patterns to evolve our systems for reliability, maintainability, and performance, contributing to PDO’s goals for operational excellence and service quality.

Collaborate closely with product management, architects, and fellow engineers in an agile environment to break down complex domain problems, run technical spikes, and ship incremental value.

Contribute to and improve our CI/CD, DevOps, and testing practices (for example, TeamCity, Kubernetes-based deployment pipelines) to support faster, safer releases and higher automation.

At Guidewire, we foster a culture of curiosity, innovation, and responsible use of AI—empowering our teams to continuously leverage emerging technologies and data-driven insights to enhance productivity and outcomes.

What you’ll bring

Required

Demonstrated ability to embrace AI and apply it to your current role as well as data-driven insights to drive innovation, productivity, and continuous improvement.

5+ years of professional software development experience, ideally in SaaS or cloud-based products.

Strong proficiency in core Java, with experience building and maintaining production microservices on a major cloud platform (preferably AWS).

Hands-on experience with JavaScript or TypeScript on the front end; experience with Python is a plus for tooling, automation, or data-related tasks.

Solid understanding of common enterprise architectural and software design patterns, and proven experience applying them in real-world SaaS applications.

Practical experience with containerization and orchestration (Docker, Kubernetes) and familiarity with CI/CD and DevOps practices and tools (for example, TeamCity, Git-based workflows).

Proven ability to use AI-assisted coding tools (e.g., Claude Code, GitHub Copilot) to accelerate development while exercising strong judgment around code quality, testing, and security.

Excellent communication skills, with the confidence to and defend ideas based on technical merit, and the humility and curiosity to learn from peers.

Preferred

Experience in the property & casualty insurance domain, financial services, or other complex, highly regulated business domains.

Experience with business rules engines or decision modeling, particularly DMN FEEL.

Background in AI/ML development patterns, including prompt engineering, model tuning, or integrating AI services into production systems.

Prior work on configuration or modeling platforms, low-code/no-code tools, or developer/productivity platforms.

BS/MS in Computer Science, Software Engineering, or a related technical field, or equivalent practical experience.

Your Impact

We believe in clarity and setting you up for success. In your first months, you’ll immerse yourself in architecture and domain, pair with senior engineers to implement features end-to-end, and start contributing improvements to our microservices, UI, and pipelines. As you ramp, you’ll own impactful projects—such as new product modeling capabilities, AI-assisted configuration workflows, or reliability and performance enhancements—that support PDO’s FY26 goals to embed GenAI into products, improve platform efficiency, and ensure every customer realizes measurable value from our solutions.

Over time, your architectural influence, hands-on coding, and AI-driven experimentation will help shape how insurers around the world design products, how our engineering teams build software, and how Guidewire delivers on its mission to transform P&C insurance through secure, scalable, and intelligent cloud services.

What’s in it for you

The people we employ give their all, and in return, we offer flexibility wherever we can, such as:

Flexible work environment, with a hybrid setup that supports both focused work and in-person collaboration.

Health and wellness benefits.

Paid time off programs, including volunteer time off.

Market-competitive pay and incentive programs.

Continual development and internal career growth opportunities, including upskilling in AI, cloud, and modern engineering practices aligned with PDO’s transformation agenda.

All roles include our in-person orientation process, giving you the chance to connect with colleagues, experience Guidewire’s culture first-hand, and build relationships that support your long-term success.

The Canadian CAD base salary range for this full-time position is $126,000 - $157,000. Your base pay will depend on your experience, skills, education, training, and location among other factors. All full-time positions or part-time roles working 30 hours or more a week at Guidewire are eligible for benefits that support their health and well-being including health, dental, and vision insurance, paid time off, and a company sponsored retirement plan. In addition, some roles may be eligible for the annual company bonus plan, commissions, and/or long term incentive awards which are contingent on a variety of factors including, but not limited to, company and employee performance.

Interested in this position?

About Guidewire

Guidewire is the platform P&C insurers trust to engage, innovate, and grow efficiently. We combine digital, core, analytics, and AI to deliver our platform as a cloud service. More than 540+ insurers in 40 countries, from new ventures to the largest and most complex in the world, run on Guidewire.

As a partner to our customers, we continually evolve to enable their success. We are proud of our unparalleled implementation track record with 1600+ successful projects, supported by the largest R&D team and partner ecosystem in the industry. Our Marketplace provides hundreds of applications that accelerate integration, localization, and innovation.

For more information, please visit www.guidewire.com and follow us on Twitter: @Guidewire_PandC.

Guidewire Software, Inc. is proud to be an equal opportunity and affirmative action employer. We are committed to an inclusive workplace, and believe that a diversity of perspectives, abilities, and cultures is a key to our success. Qualified applicants will receive consideration without regard to race, color, ancestry, religion, sex, national origin, citizenship, marital status, age, sexual orientation, gender identity, gender expression, veteran status, or disability. All offers are contingent upon passing a criminal history and other background checks where it's applicable to the position.

Apply Now

Refine Your Search

senior javascript full stack developer jobs in mississauga, on

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Senior Software Developer

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Senior Specialist - Software Engineering

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RQ00580 - Sr. Full Stack Developer, Digital Experience Platform

Senior Lead Software Engineer – Regulatory Reporting & Big Data

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Senior Software Engineer | Remote | AI SaaS Software Role

Principal Software Engineer - Platform, Identity and BI

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