Junior Fullstack Engineer

Reposted 4 Days Ago
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Guadalajara, Jalisco, MEX
In-Office
Senior level
Blockchain • Fintech • Payments • Software • Financial Services • Cryptocurrency
Paystand
The Role
Lead architecture and development of Paystand’s user-facing full-stack applications and reusable frameworks. Build scalable, secure financial systems across frontend, backend, data, infrastructure, and integrations. Apply AI-assisted development throughout the engineering lifecycle and help deliver AI-enabled product capabilities. Collaborate with product, design, and engineering teams, provide technical leadership and mentorship, operate production systems, and drive quality, observability, reliability, and continuous improvement.
Summary Generated by Built In

Paystand is the world's leading blockchain-enabled B2B payments network, transforming commercial finance into a software-driven, zero-fee, and open ecosystem. Recognized as a CNBC/Statista 2026 World's Top Fintech company, Paystand delivers over a decade of on-chain payments experience to middle and large enterprises.

Paystand's network services more than one million payors that have moved $20+ billion in volume. With its acquisitions of Yaydoo, Teampay and Bitwage, Paystand's full-stack platform includes agentic AI, its USDb stablecoin, and AR/AP solutions on one tightly integrated network. Its non-profit arm, Paystand.org, advances the mission to democratize finance through Bitcoin and blockchain technology.

What We Do

We built the financial system we always thought should exist: zero fees, zero friction, just your money, faster. Blockchain automates receivables and payables, cuts time-to-cash, and turns every transaction into revenue instead of cost.

Why We Do It

The current system takes a cut from the people who build, create, and grow — and calls it the cost of doing business. We don't buy that. Every fee we eliminate compounds into growth. We're here to decentralize finance and hand the power back to the businesses driving the real economy — extended further through Paystand.org's work to democratize finance through Bitcoin and blockchain.

How We Do It

We don't wait for permission or for the industry to catch up — we build the future of finance ourselves, on-chain, in the open. Small moves now, monumental results later.

Join Us

We're not looking for people who want a job in fintech. We're looking for people who want to build what comes after it. Paystand is where you help lead a financial revolution instead of just reading about one. We stand on change. Come stand with us.

 

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.

If you're passionate about driving change in the FinTech landscape and being part of a company that is shaping the future of digital payments, we invite you to explore opportunities with Paystand.

We understand that no candidate is perfectly qualified for any job. Experience manifests in diverse ways, skills are transferable, and passion is a powerful driver. Your journey and skills are unique, and we value the richness that diverse perspectives bring to our team.

More than a resume, we prioritize a genuine commitment, impactful contributions, and the ability to thrive in our dynamic, collaborative environment. We are enthusiastic about providing you with opportunities to learn and grow within this role. If your experience aligns closely with what we're seeking, we encourage you to apply.

We celebrate the belief that diversity in backgrounds and thoughts fuels better problem-solving and fosters more creative thinking. Our commitment to adding new perspectives to the team reflects our dedication to innovation and inclusivity.

Your journey is important to us, and we look forward to the possibility of welcoming you to our team at Paystand. Feel free to reach out; we can't wait to hear from you.

Most of our roles are onsite. Positions that are eligible for remote or hybrid work arrangements will be clearly indicated in the job posting.

For roles based in Mexico, only resumes submitted in English will be considered.#LI-Onsite 

Skills Required

  • 7+ years of professional software engineering experience
  • Experience independently delivering products or major capabilities from concept through production
  • Strong full-stack engineering capability across frontend, backend, data, infrastructure, and integrations
  • Experience solving ambiguous business problems and designing, deploying, and improving practical solutions
  • Fluency with AI-assisted and agent-led software development tools such as Claude, Claude Code, OpenAI Codex, or comparable platforms
  • Experience using AI for discovery, architecture, planning, implementation, testing, debugging, documentation, code review, and operational analysis
  • Experience building AI-enabled product capabilities using model APIs, structured outputs, tool calling, retrieval, evaluations, guardrails, and human-in-the-loop workflows
  • Strong understanding of modular architecture, API design, asynchronous and event-driven processing, data consistency, caching, and integration patterns
  • Experience with relational databases, data modeling, distributed systems, observability, automated testing, and production troubleshooting
  • Knowledge of secure engineering practices including authorization, data protection, auditability, failure recovery, and idempotent processing
  • Strong experience with a modern frontend ecosystem such as React, Next.js, Vue, or Angular
  • Strong experience with a production backend ecosystem such as Node.js/TypeScript, Python, Java, Go, or Elixir
  • Ability to design APIs and data contracts and integrate internal services, third-party platforms, and legacy systems
  • Hands-on experience designing, deploying, and operating production systems on AWS or Google Cloud
  • Working knowledge of Cloudflare capabilities such as DNS, CDN, edge security, traffic management, or Workers
  • Experience with containers, infrastructure as code, CI/CD, environment management, secrets management, and automated deployments
  • Understanding of horizontal scaling, load management, queues, caching, database scaling, fault tolerance, disaster recovery, and multi-region systems
  • Ability to implement observability through logs, metrics, traces, alerts, and business workflow monitoring
  • Experience owning production software, including incident response, root-cause analysis, and continuous improvement
  • Product mindset and ability to co-own a product area from customer problem through technical delivery and adoption
  • Strong written and verbal communication skills
  • Demonstrated technical leadership through architecture, execution, code review, mentorship, and engineering standards
  • Experience with payment, fintech, accounting, ERP, banking, or transaction-intensive products
  • Experience with money movement, reconciliation, ledgers, approvals, or external financial integrations
  • Experience operating AI agents and agentic workflows in production
  • Familiarity with workflow orchestration, event streaming, or durable execution technologies
  • Experience with blockchain, digital assets, smart contracts, or decentralized systems
  • Open-source contributions or involvement in technical communities
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The Company
HQ: Santa Cruz, CA
400 Employees
Year Founded: 2013

What We Do

Paystand's on a mission to create a more open financial system, starting with B2B payments. Using blockchain and cloud technology, we pioneered Payments-as-a-Service to digitize and automate the entire cash lifecycle. Our software makes it possible to digitize receivables, automate processing, reduce time-to-cash, eliminate transaction fees, and enable new revenue.

Why Work With Us

At Paystand, we unlock global economic empowerment for the operators of the real economy (and the people they serve). By building an open, decentralized network of technology, companies, and people to redistribute economic advantages to those who create real value…one open transaction at a time.

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