Payment Solution Engineer
Unlimit is a London-based global fintech providing cross-border payment processing, business accounts, banking-as-a-service, card issuing, and crypto/stablecoin payment infrastructure.
About Unlimit
Founded in 2009, Unlimit operates a global financial-services platform for businesses, combining payment processing, local and international payment methods, multicurrency business accounts, banking-as-a-service APIs, card issuing, payment rails, and digital-asset on/off-ramp capabilities. The company is headquartered in London and operates across multiple continents.
Skills
Candidate Availability
Required and preferred rules are kept separate and reflect the wording in the original posting.
About the Role
You'll act as both project lead and solution engineer, running each integration with a regulator or provider while doing the technical implementation yourself. You will own projects connecting Unlimit to banking infrastructure, design and build local clearing and payment-system connections, manage onboarding through certification and production activation, and document integrations for engineering and operations.
Requirements
- 5+ years in payments, banking, or integration engineering with ownership of complex integration projects.
- Direct experience integrating with central banks or national clearing and settlement systems.
- Familiarity with payment schemes and networks such as SWIFT and SEPA.
- Strong understanding of payment rails, clearing, and settlement flows.
- Experience with ISO 20022, MT/MX, SOAP/REST web services, and certificate-based authentication.
- Ability to run regulated projects independently and manage regulator communication.
- Awareness and practical use of AI-driven engineering tools, LLMs, AI-assisted development environments, or automation frameworks.
- Clear, structured communication skills for working with regulators and technical counterparties.
Responsibilities
- Own central bank and clearing integration projects end to end, from kickoff to go-live.
- Act as the primary technical and project contact for regulators and their assigned counterparts.
- Manage credentials, environment setup, certification test cases, and production activation.
- Set and defend realistic launch timelines and keep projects on track.
- Design and implement connections to local clearing and payment systems.
- Deliver integrations with third-party BaaS providers to bring additional payment rails online.
- Document integrations and hand over maintainable solutions to engineering and operations.
Benefits
- Ownership of high-impact projects that unlock new markets.
- Exposure to acquiring, BaaS, wallets, crypto, and other fintech products.
- Global company with a strong engineering culture, agile mindset, and flat hierarchy.
- Collaboration with international teams across EU, LATAM, and APAC.