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Senior Full Stack Developer Jobs in Whitby, ON (NOW HIRING)

Scotiabank

Full Stack Developer

Toronto, ON · On-site

... Senior Manager, on the design, development, integration, and implementation of Insider Threat ... computer engineering or related field and 5+ years of full stack development experience required ...

Konrad

Full Stack Developer

Toronto, ON · Hybrid

CA$90K - CA$120K/yr

About The Role As a Full Stack Developer you'll be tasked with working on one of our web application projects. Working within the software development team, your duties will require you to assist in ...

Codal

Senior Full Stack Engineer

Toronto, ON

Optimize application performance, scalability, and security across the stack. * Participate in ... Troubleshoot, debug, and resolve production issues in collaboration with DevOps and QA teams.

Codal

Senior Full Stack Engineer

Toronto, ON

CA$110K - CA$125K/yr

Optimize application performance, scalability, and security across the stack. * Participate in ... Troubleshoot, debug, and resolve production issues in collaboration with DevOps and QA teams.

Morson Talent

25-189 - Full Stack Developer

Oshawa, ON · Hybrid

$70 - $80/hr

Full Stack Developer Resume Due Date: November 21st, 2025 (5:00PM EST) Number of Vacancies: 2 Level: MP4 Duration: 12 Months Hours of work: 35 hours Location: 1908 Colonel Sam Drive, Oshawa (Hybrid ...

Synechron

Python Full Stack Developer

Toronto, ON · Hybrid

CA$105K - CA$115K/yr

As a Full Stack Developer, candidate will be responsible for designing, building, and maintaining robust end-to-end solutions - with a deep focus on understanding the underlying systems work with.

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Senior Full Stack Developer information

What is the difference between Senior Full Stack Developer vs Backend Developer?

AspectSenior Full Stack DeveloperBackend Developer
Required SkillsProficiency in both frontend and backend technologies, such as JavaScript, HTML, CSS, and server-side languages like Node.js, Python, or JavaSpecialized in server-side development, working with languages like Java, Python, Ruby, or PHP, and database management
Work EnvironmentCollaborates across frontend and backend teams, often involved in full project lifecycleFocuses primarily on backend systems, APIs, and database integration
Common UsageUsed in roles requiring full project oversight and versatile development skillsUsed in roles focused on server-side logic, database management, and API development

The main difference is that a Senior Full Stack Developer handles both frontend and backend development, providing a comprehensive approach to projects, while a Backend Developer specializes solely in server-side logic and database management. Both roles require strong programming skills, but the Full Stack Developer's expertise spans the entire technology stack.

How does a Senior Full Stack Developer typically collaborate with cross-functional teams during a project lifecycle?

As a Senior Full Stack Developer, you'll frequently collaborate with designers, product managers, QA engineers, and other developers to deliver end-to-end solutions. You'll be involved in requirements discussions, offer technical guidance, and help align frontend and backend development with business goals. Your role often includes code reviews, mentoring junior team members, and ensuring seamless integration across various systems. This collaborative environment encourages knowledge sharing and innovation while ensuring project success.

What are the key skills and qualifications needed to thrive as a Senior Full Stack Developer, and why are they important?

To thrive as a Senior Full Stack Developer, you need advanced proficiency in both front-end and back-end programming languages, frameworks, and a solid understanding of software architecture, usually supported by a relevant degree and several years of experience. Mastery of tools such as Git, Docker, CI/CD systems, and cloud platforms like AWS or Azure is typically required, alongside familiarity with databases and version control systems. Strong problem-solving abilities, leadership, effective communication, and collaboration skills set exceptional developers apart. These skills and qualities are crucial for delivering robust, scalable solutions while mentoring teams and efficiently bridging gaps between client requirements and technical implementation.

What are Senior Full Stack Developers?

Senior Full Stack Developers are experienced professionals who design, develop, and maintain both the front-end and back-end components of web applications. They are proficient in multiple programming languages and frameworks, enabling them to handle servers, databases, APIs, and user interfaces. In addition to coding, they often lead development teams, make architectural decisions, and ensure software quality and scalability. Their expertise allows them to oversee the entire application lifecycle, from concept to deployment.
What job categories do people searching Senior Full Stack Developer jobs in Whitby, ON look for? The top searched job categories for Senior Full Stack Developer jobs in Whitby, ON are:
What cities near Whitby, ON are hiring for Senior Full Stack Developer jobs? Cities near Whitby, ON with the most Senior Full Stack Developer job openings:
Senior Full Stack Developer jobs near you
Infographic showing various Senior Full Stack Developer job openings in Whitby, ON as of July 2026, with employment types broken down into 83% Full Time, 3% Part Time, 1% Temporary, and 13% Contract. Highlights an 80% Physical, 5% Hybrid, and 15% Remote job distribution.

Senior Full Stack Software Engineer

AltaML

Toronto, ON

Full-time

Posted 4 days ago

Job description

We're looking for a Senior Full Stack Software Engineer who is passionate about building high-quality software in an AI-native way. Someone who treats Claude and the latest agentic coding tools as a core part of their craft, not a novelty. In this role, you will own technical delivery end-to-end, from shaping the architecture of ML-powered applications to leading implementation across cloud services, APIs, and modern front-end frameworks, with Claude Code, the Claude Agent SDK, and the Claude API woven into how you design, build, and ship.

You will act as the technical backbone of your project pod, balancing hands-on development with technical leadership, architectural decision-making, and client-facing collaboration. You'll lead epic-level solution design, mentor developers on how to get the most out of Claude in their day-to-day workflows, contribute to shared internal frameworks and skills/plugins, and help shape how we evaluate and deploy emerging AI engineering tooling.

You will thrive in this role if you are:

  • A builder at heart who leans on Claude Code to spin up prototypes in hours and scale them into production-grade systems with confidence.
  • Fluent in agentic development patterns. Writing good specs for Claude, structuring repos so AI agents can navigate them, reviewing AI-generated code critically, and knowing when to delegate versus when to hand-code.
  • A strong communicator who can translate between business requirements, technical realities, and what modern AI tooling actually makes feasible.
  • A decision-maker who brings clarity to ambiguous technical challenges and can evaluate when an LLM-in-the-loop is the right solution versus traditional software.
  • Excited by ML-enabled product development and eager to bridge software engineering with intelligent automation and agentic workflows.
What You'll Do:
  • Reduced Project Risk: Technical risks on projects are significantly reduced through proactive ownership of epic-level technical design, execution, and cross-team dependency resolution accelerated by effective use of Claude for research, code review, and rapid exploration of design alternatives.
  • Improved Technical Decision-Making: The team makes better technology choices through thorough research, evaluation, and documentation of potential solutions, including informed decisions on when and how to apply Claude, MCP servers, and agentic tooling versus conventional approaches.
  • Stronger Client Confidence: Client and stakeholder confidence is increased by leading technical discovery sessions and acting as a technical SME during project discussions, including on the pragmatic use of LLMs and AI-assisted development in client deliverables.
  • Feature & Epic Implementation: Leads implementation for features spanning multiple user stories or services, using Claude Code and agent-driven workflows to accelerate delivery without sacrificing quality.
  • Architecture & Solution Design: Leads the architecture design for moderately complex solutions, often involving multiple services or systems, and chairs technical reviews including architecting LLM-powered features, agent tool integrations, and MCP server designs.
  • AI Engineering Leadership: Champions best practices for working with Claude across the pod, prompt design, skill and subagent creation, context management, MCP integrations, evaluation of AI-generated code, and secure / cost-aware usage of the Claude API.
  • Mentorship & Technical Leadership: Provides technical leadership within the pod, mediates code review disputes, contributes new features and skills to shared AltaML libraries, and assists in the hiring process by conducting technical interviews. Coordinates the work of other engineers and levels them up on modern AI-assisted development.
  • Client Engagement & Discovery: Leads technical discovery sessions with clients to clarify requirements, define technical scope, and identify where Claude-powered features or agentic workflows unlock real product value.
  • Testing & Quality Strategy: Implements higher-level testing strategies, including integration and end-to-end tests for deployed solutions, plus evaluation harnesses for LLM-powered features (regression tests for prompts, agent behaviours, and tool use).
What You Bring:
  • Degree or equivalent work experience in Computer Science, Software Development, or similar
  • 5+ years of experience as a full stack developer
  • Demonstrable, hands-on experience using Claude (Claude Code, claude.ai, or the Claude API) as a daily driver for real software engineering work, not just casual chat use
  • Proven skills at taking ideas from conception to production, including shipping features that are partly or fully built with AI-assisted workflows
  • Strong working experience with Cloud Services (ideally Azure)
  • Strong working experience in a modern object-oriented language
  • Strong working experience writing clean, readable, and easily maintainable code, and a clear point of view on reviewing and hardening AI-generated code
  • Experience with Unit and API testing (e.g., xUnit, Postman, or others)
  • Experience working in an agile environment
  • Experience with Docker
  • Proficiency with Version Control systems (VCS), including working effectively with AI agents in a git-based workflow
$130,000 - $150,000 a year
We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses and identifying potential inconsistencies or verification signals in application materials based on available information. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.
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