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Block Labs

Web3 Incubator & Investment

Senior Software Engineer – Payments

Full-stack EngineerSoftware EngineerFull TimeRemoteSeniorTeam 51-200Since 2022H1B No SponsorCompany SiteLinkedIn

Location

Portugal

Posted

96 days ago

Salary

0

Seniority

Senior

Bachelor Degree4 yrs expEnglishPHPReactTypeScript

Job Description

Senior Software Engineer – Payments

Block Labs

• Design, implement and improve backend services supporting payment and transaction flows. • Develop and refine frontend components that power deposit, withdrawal and account experiences. • Own end to end third party payment and supplier integrations. • Implement and maintain secure authentication, webhook validation, signature verification and callback handling. • Improve integration architecture and internal tooling to reduce onboarding time for new providers. • Ensure transactional integrity, idempotency and reliability across all payment flows. • Identify bottlenecks that slow down integration and delivery cycles and propose structural improvements. • Write clean, efficient and maintainable code with strong focus on scalability and resilience. • Collaborate closely with backend, frontend, QA and DevOps teams to deliver reliably and quickly. • Manage individual project priorities, deadlines and deliverables.

Job Requirements

  • 4+ years of experience as a Full Stack Engineer working on backend and frontend systems.
  • Strong experience building and maintaining APIs and transactional backend services.
  • Experience contributing to modern frontend applications such as React.
  • Comfortable working in environments that include Go, TypeScript and PHP.
  • Proven experience integrating third party APIs, ideally payment providers or financial services.
  • iGaming, fintech or other high transaction system experience is required.
  • Solid understanding of authentication flows, external callbacks, webhooks and idempotent systems.
  • Pragmatic mindset focused on shipping and improving time to market.
  • Strong debugging and problem solving skills.
  • Comfortable owning a feature or integration from design to production.
  • Fluent in English, both spoken and written.

Benefits

  • Competitive salary
  • Flexible working hours
  • Professional development opportunities

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