Full Stack Engineer

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PaymentGenes are supporting ahigh-growth fintech company is building next-generation financial infrastructure focused on enabling fast, efficient international funds distribution for businesses. Currently midway through an MVP build, the team is looking to hire a Senior Full Stack Engineer to join at a critical stage of product development.

You will work closely with a small, experienced engineering team to help design and deliver a regulated financial platform from the ground up, with a strong emphasis on performance, scalability, and security.

The Opportunity

This role offers end-to-end ownership across the stack, with involvement in architecture, implementation, and building systems designed for compliance within a regulated environment. The team is focused on creating robust, auditable, and scalable systems from day one.

Key Responsibilities

  • Design and build end-to-end features across frontend and backend
  • Contribute to transaction processing and ledger systems
  • Develop event-driven services using modern architectural patterns
  • Build real-time functionality using WebSockets
  • Integrate with third-party providers (e.g. identity verification, payments)
  • Support fraud prevention and monitoring capabilities
  • Contribute to infrastructure and CI/CD pipelines
  • Ensure systems are secure, resilient, and compliant

Technology Stack

  • TypeScript across the stack
  • Modern backend frameworks (Node.js ecosystem)
  • React (TypeScript) and contemporary UI libraries
  • Relational and NoSQL databases (e.g. PostgreSQL, DynamoDB)
  • Cloud-native infrastructure (AWS or similar)
  • Event-driven architecture
  • Monorepo setup and CI/CD pipelines

What We’re Looking For

  • 5–7 years of software engineering experience
  • Strong full stack development experience with TypeScript
  • Experience building and scaling production systems
  • Solid understanding of APIs and distributed systems
  • Experience with relational databasesAwareness of security and compliance considerations
  • Comfortable working in a fast-paced, startup environment

What’s on Offer

  • Hybrid working model (London-based)
  • Early-stage opportunity with real ownership and impact
  • Strong engineering culture and standards
  • Competitive benefits package including pension
  • Dedicated time for learning and development
  • Collaborative, low-ego environment

#J-18808-Ljbffr”, “datePosted”: “2026-05-04”, “hiringOrganization”: { “@type”: “Organization”, “name”: “Pentasia”, “sameAs”: “https://uk.whatjobs.com/pub_api__cpl__422601791__4861?utm_campaign=publisher&utm_medium=api&utm_source=4861&geoID=33” }, “jobLocation”: { “@type”: “Place”, “address”: { “@type”: “PostalAddress”, “addressLocality”: “London” } } }
Company: Pentasia
Apply for the Full Stack Engineer
Location: London
Job Description:

PaymentGenes are supporting ahigh-growth fintech company is building next-generation financial infrastructure focused on enabling fast, efficient international funds distribution for businesses. Currently midway through an MVP build, the team is looking to hire a Senior Full Stack Engineer to join at a critical stage of product development.

You will work closely with a small, experienced engineering team to help design and deliver a regulated financial platform from the ground up, with a strong emphasis on performance, scalability, and security.

The Opportunity

This role offers end-to-end ownership across the stack, with involvement in architecture, implementation, and building systems designed for compliance within a regulated environment. The team is focused on creating robust, auditable, and scalable systems from day one.

Key Responsibilities

  • Design and build end-to-end features across frontend and backend
  • Contribute to transaction processing and ledger systems
  • Develop event-driven services using modern architectural patterns
  • Build real-time functionality using WebSockets
  • Integrate with third-party providers (e.g. identity verification, payments)
  • Support fraud prevention and monitoring capabilities
  • Contribute to infrastructure and CI/CD pipelines
  • Ensure systems are secure, resilient, and compliant

Technology Stack

  • TypeScript across the stack
  • Modern backend frameworks (Node.js ecosystem)
  • React (TypeScript) and contemporary UI libraries
  • Relational and NoSQL databases (e.g. PostgreSQL, DynamoDB)
  • Cloud-native infrastructure (AWS or similar)
  • Event-driven architecture
  • Monorepo setup and CI/CD pipelines

What We’re Looking For

  • 5–7 years of software engineering experience
  • Strong full stack development experience with TypeScript
  • Experience building and scaling production systems
  • Solid understanding of APIs and distributed systems
  • Experience with relational databasesAwareness of security and compliance considerations
  • Comfortable working in a fast-paced, startup environment

What’s on Offer

  • Hybrid working model (London-based)
  • Early-stage opportunity with real ownership and impact
  • Strong engineering culture and standards
  • Competitive benefits package including pension
  • Dedicated time for learning and development
  • Collaborative, low-ego environment

#J-18808-Ljbffr…

Posted: May 4th, 2026