Junior Fullstack Engineer

Role at a Glance

AI is core to how we build Paystand’s open banking network and transform how businesses pay and get paid. We’re seeking a Junior Full-Stack Engineer ready to tackle meaningful technical challenges and ship customer-facing payment experiences. You’ll combine AI-assisted development with sound engineering judgment, ensuring your solutions fit the broader product. Working alongside experienced engineers, you’ll own scoped frontend and backend projects, move quickly, and grow your capabilities while building software that businesses depend on.

AI-First Engineering Expectations

Paystand is an AI-first organization. We expect engineers at every level to combine AI-powered development with the technical judgment needed to build reliable software. As a Junior Full-Stack Engineer, you are expected to:

• Apply AI coding assistants and development agents across implementation, testing, debugging, and documentation to increase development velocity while maintaining engineering standards.
• Provide AI tools with clear requirements, relevant codebase context, and acceptance criteria. Critically review generated code, verify its behavior, and ensure it aligns with customer needs and existing architecture.
• Develop AI-enabled features and integrations using established architectural patterns, with technical guidance and review from experienced engineers.
• Identify opportunities to automate repetitive engineering tasks and implement improvements to testing, documentation, and development workflows.
• Evaluate emerging AI tools and development practices, assess their value for Paystand’s engineering workflows, and contribute to their adoption within the team.

Role and Key Responsibilities

• Deliver frontend and backend features for Paystand’s open banking network, taking ownership of scoped work from implementation through release with guidance from experienced engineers.
• Build reusable components, APIs, and service integrations that follow established architectural patterns and support maintainable applications.
• Collaborate with product owners, designers, and engineers to translate customer and business needs into reliable, intuitive payment experiences.
• Write maintainable code, develop automated tests, and troubleshoot defects to meet engineering standards for correctness, security, and performance.
• Contribute to technical discussions and code reviews, incorporate feedback, and communicate progress, dependencies, and blockers to support timely delivery.

Requirements & Qualifications

• AI-assisted development: Hands-on experience with AI coding assistants and development agents such as Claude Code, OpenAI Codex, or comparable tools. Ability to provide clear requirements and relevant codebase context, critically evaluate generated code, and explain how a solution meets customer needs and integrates with existing systems.
• Builder experience: 1–2 years of relevant software development experience, including internships, or demonstrated ability through substantial personal, academic, or open-source projects. Ability to explain your contributions, technical decisions, and how you validated the results.
• Frontend development: Practical experience with JavaScript or TypeScript, HTML, CSS, and a modern framework such as React, Next.js, Vue, or Angular, with attention to usability and responsive design.
• Backend development: Practical experience with a backend language or framework, such as Node.js, Python, Java, or Go, including building or integrating REST APIs and working with application data.
• Engineering fundamentals: Understanding of modular code design, relational databases, SQL, and Git-based workflows, including branches, pull requests, and code reviews.
• Cloud and delivery: Familiarity with deploying applications to AWS, Google Cloud, or a comparable platform, including through personal or academic projects. Basic understanding of CI/CD pipelines, environment configuration, and application logs, with the ability to follow established deployment workflows and troubleshoot issues with guidance.
• Quality and problem-solving: Ability to debug issues systematically, write automated tests, and validate functionality and edge cases. Foundational understanding of secure coding practices, including input validation, access controls, and handling sensitive information.
• Product thinking and collaboration: Ability to connect implementation decisions to customer and business needs, explain technical reasoning, ask focused questions, and incorporate feedback from engineering, product, and design.
• Self-directed learning and ownership: Initiative to navigate unfamiliar codebases, research and test solutions independently, and contribute early, while asking focused questions, escalating blockers, and following through on delivery.

Perks & Benefits

At Paystand, we offer a comprehensive benefits package that goes beyond statutory requirements:

• 🛡️ Statutory benefits, including IMSS, INFONAVIT, and AFORE.
• 🏖️ Paid vacation with an enhanced vacation premium.
• 🎄 Annual Christmas bonus (*aguinaldo*).
• 🛒 Monthly food vouchers.
• 🏦 Savings fund with a matching company contribution.
• 🏥 Company-provided major medical insurance.
• 📈 Stock option eligibility under Paystand’s equity incentive plan, subject to approval.
• 💻 Company-provided equipment and tools.