Senior Full-Stack Developer

About the Role  

We’re looking for a Senior Full-stack Developer with 5+ years of professional experience and a passion for application development to join our engineering team in a dynamic startup environment. This is a hands-on role where you’ll build, optimize, and scale critical features across our payment systems (both front-end and back-end). You’ll collaborate closely with support, product, and design teams, contribute to architecture decisions, fix bugs, and write production-level code that moves the needle for our customers.  

What You’ll Do 

• Design, build, and maintain scalable full-stack applications supporting Valpay’s embedded payments platform

• Develop and evolve APIs, backend services, and frontend interfaces used by SaaS partners and internal teams

• Work closely with Product, Customer Support, and Customer Success to translate requirements into thoughtful technical solutions

• Work with APIs and payment infrastructure to integrate third-party services.

• Help shape architecture and data strategy as we scale our platform.

• Troubleshoot, debug, and continuously improve performance and reliability.

• Ensure high standards for security, reliability, and performance in a regulated payments environment

• Participate in code reviews and provide mentorship to junior developers.

• Write and maintain clear technical and data documentation.

• Leverage AI tools and agentic workflows to optimize your velocity.

• Share your lessons learned with your teammates.

What You Bring 

Core Requirements 

• 5 years of professional experience as a backend developer with front-end experience or vice-versa, with exposure to product engineering workflows.

• Proficient in most aspects of the Software Development Life Cycle (SDLC).

• Proficiency with some of the technologies used in our tech stack (see below).

Technical Competencies 

• Strong problem-solving skills and attention to detail.

• Strong experience building modern web applications and APIs

• Proficiency in backend technologies (e.g., Node.js, Java, C#, or similar)

• Experience with frontend frameworks (e.g., React, Angular, Vue)

• Solid understanding of databases (SQL and/or NoSQL)

• Experience working in cloud environments (AWS, GCP, or Azure)

• Strong fundamentals in system design, scalability, and performance

• Knowledge of security best practices in web development and data handling.

• Bonus: experience in fintech, payments, or other regulated environments

Soft Skills & Mindset 

• Collaborative mindset with strong communication skills.

• Excitement about fintech and a desire to work on real-world payment systems.

• Self-starter attitude, comfortable with ambiguity, and eagerness to take ownership.

• Hybrid work mode: on-site in Ville-Saint-Laurent office 2–3 days a week.

• Continuous learning mindset and adaptability to new technologies.

Bonus Points For  

• Experience with payments, banking APIs, or financial compliance systems.

• Familiarity with some DevOps practices and CI/CD pipelines.

• Contributions to open-source projects or technical blogs.

• Knowledge of financial data regulations and compliance requirements

Our Technical Stack 

• Frontend: React with TypeScript, Material-UI (MUI), Redux, responsive design.

• Backend: Node.js, TypeScript, MongoDB, RESTful API design.

• Database & Data: MongoDB, Snowflake, ETLs, SQL/NoSQL optimization.

• Cloud: AWS (ECS, CloudWatch, SQS, S3, Lambda, etc.), Docker, GitHub Actions.

• Testing & Quality: Jest, ESLint, SonarQube, Postman, automated tests.

• AI: Cursor, ChatGPT, Devin, Copilot, Codex, Claude Code, etc.

Why Valpay 

• Build products that power real revenue for SaaS companies

• Work on complex, meaningful technical challenges in payments and compliance

• High-impact role with ownership and influence over technical direction

• Collaborative, pragmatic engineering culture

• Competitive compensation and benefits

• Flexible, remote-friendly work environment