Senior Full-Stack Engineer: Build Scalable APIs & UI

Requirements

• 5+ years of software engineering experience with a track record of shipping production systems or features
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• Experience building backend services using relational databases such as MySQL, and working with microservices or service-oriented architectures
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• Strong working knowledge of HTML, CSS, JavaScript, and modern frontend frameworks or libraries, with comfort building user-facing experiences
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• Solid system design, coding, and testing skills across both frontend and backend
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• Proven ability to collaborate effectively with product, design, and other engineering partners
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• Experience mentoring or supporting the growth of other engineers through reviews, guidance, or leadership
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• Comfortable working across product, operations, and data teams to deliver end-to-end solutions
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• We encourage you to apply to a role even if your experience doesn't fully match the job description

What the job involves

• You will work across the stack, building scalable backend services and APIs while also crafting intuitive, high-quality frontend experiences that bring those systems to life. This role is ideal for engineers who enjoy switching between backend problem-solving and frontend user experience work, and who are excited to grow their impact across both
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• You will collaborate closely with product managers, designers, and other engineers to ship products that are reliable, secure, and delightful to use. At Plaid, engineers take ownership early, contribute to architectural decisions, and see their work reach millions of users
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• Build across the stack. Design, develop, and maintain scalable backend services and APIs, as well as intuitive, high-quality frontend applications that bring those systems to life
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• Collaborate cross-functionally. Partner closely with product managers and designers to define requirements and deliver features that solve real customer problems
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• Maintain high code quality. Write clean, maintainable, and well-tested code, and participate in code reviews and technical design discussions
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• Test and debug. Build automated tests, monitor system performance, and troubleshoot issues in production environments
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• Contribute to system design. Engage in hands-on coding and architectural decisions to ensure reliability, security, and scalability
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• Grow the team. Support a strong engineering culture through mentorship, thoughtful reviews, and shared ownership of technical standards