Founding Engineer & Engineering Leader, FinTech Core

Dex; Greater London; On-site; GBP 120,000 - 180,000; Full time

Job summary

Dex, in partnership with a pioneering fintech, is building a new core banking platform from first principles in London. The role focuses on designing secure, scalable financial infrastructure and owning the architecture end to end.

You will translate ambitious product concepts into production-ready systems, establish engineering culture, and recruit the founding team as the company scales, with in-person collaboration in London.

Qualifications

• 5-12 years of engineering experience in backend systems, infrastructure and production architecture.
• Experience building complex, regulated financial infrastructure (core banking, ledger, payments).
• Founding engineer/early hire or senior scale-up experience in fintech or infrastructure.

Responsibilities

• Architect, build, and own the core banking platform from first principles.
• Design and implement highly secure, scalable, and regulated financial infrastructure.
• Drive all technical decisions across architecture, infrastructure, security, and product engineering.
• Translate product concepts into production-ready systems with data integrity and reliability.
• Establish the engineering culture and recruit the foundational team as the company scales.

Skills

Backend systems

Distributed systems

Cloud infrastructure

Data integrity

Reliability

Security

Tools

APIs

Distributed systems

Cloud infrastructure

Data integrity

Reliability

Security

Job description

Dex, in partnership with a pioneering fintech, is building a new core banking platform from first principles in London. The role focuses on designing secure, scalable financial infrastructure and owning the architecture end to end.

You will translate ambitious product concepts into production-ready systems, establish engineering culture, and recruit the founding team as the company scales, with in-person collaboration in London.