Senior/ Lead FullStack Engineer

Canadian time zone

Time: 6 months

About the Opportunity

Our client is a leading European online car marketplace, serving 30M+ monthly users across 18 countries.

As a Senior/Lead FullStack Engineer:

• You will play a key technical leadership role within the client’s engineering organization. You will design, build, and evolve scalable backend services and user-facing features across our product suite.
• You will contribute across a polyglot stack that includes PHP (Laravel), JavaScript, and TypeScript, collaborating closely with product managers, designers, and other engineers to deliver robust, maintainable, and secure solutions.
• This role requires a high level of proficiency in using AI tools in day-to-day software development. AI-assisted workflows are not optional—they are an expected part of how we design, implement, test, debug, document, and optimize software. As a Senior/ Lead engineer, you will also help elevate your team’s AI capabilities by modeling effective usage patterns and sharing best practices.

What You'll Do

• Architect, design, and implement scalable services and product features using PHP (Laravel)
• Build and maintain frontend features using JavaScript and TypeScript
• Use AI tools extensively for code generation, refactoring, test creation, debugging, performance optimization, and documentation
• Critically evaluate AI-generated outputs to ensure correctness, security, maintainability, and alignment with architectural standards
• Lead technical design discussions and contribute to system and API architecture decisions
• Own complex features end-to-end, from technical design through deployment, monitoring, and iteration
• Drive improvements in code quality, performance, reliability, and security
• Write clean, maintainable, and well-tested code with strong automated test coverage
• Conduct in-depth code reviews and mentor engineers through actionable feedback
• Coach teammates on effective and responsible AI usage in software engineering workflows
• Collaborate cross-functionally to translate business requirements into scalable technical solutions
• Contribute to cloud infrastructure and services (AWS), ensuring high availability and operational excellence
• Participate in compensated on-call rotations to ensure platform reliability
• Champion DevOps best practices, CI/CD improvements, and observability standards
• Identify and lead technical initiatives that improve long-term platform sustainability

What We're Looking For

• 6-8 years of extensive professional experience in backend software development
• Strong expertise in PHP and Laravel (6+ years)
• Proficiency in JavaScript and TypeScript for modern frontend development
• Demonstrated advanced proficiency using AI tools in day-to-day engineering work (code generation, debugging, test automation, documentation, architectural exploration)
• Strong ability to validate, refine, and productionize AI-assisted outputs
• Experience improving team-level engineering practices
• Deep understanding of API design, distributed systems, and scalable architecture patterns
• Experience working with AWS or similar cloud environments
• Strong knowledge of CI/CD pipelines and modern DevOps practices
• Experience designing and optimizing relational databases and data models
• Proven ability to independently lead complex technical initiatives
• Strong problem-solving skills and ability to navigate ambiguity
• Clear and effective communication skills
• Participate in compensated on-call rotations to ensure reliability of our backend services
• Canadian timezone working hours
• English proficiency at B2/C1 level or higher.

Nice to Have

• Experience integrating AI capabilities into production products (e.g., LLM integrations, AI-driven features, intelligent workflows)
• Experience designing AI-enabled user experiences or backend AI services
• Experience in automotive, dealer software, or SaaS platforms
• Experience with containerization (Docker, Kubernetes)
• Event-driven architectures and messaging systems
• Performance tuning and high-scale system optimization
• Experience working in multi-product platform environments