Senior Core Banking Developer in London

We’re looking for a Thought Machine (4th Generation) Developer to design, build, and evolve core banking products on modern, cloud-native platforms. You’ll configure and implement Vault-based product logic (or equivalent product/ledger engines), build integration services and APIs, and partner with engineering, product, operations, and risk teams to deliver secure, scalable financial capabilities. This role suits candidates with direct Thought Machine experience or a comparable background building digital banking products on modern core platforms, with strong engineering fundamentals and an appreciation for ledger integrity, financial controls, and operability.

Accountabilities and Responsibilities

• Product & Ledger Engineering
  • Design and implement core banking product logic (e.g., accounts, deposits, lending, fees, interest, limits, delinquency, posting rules) using Thought Machine’s framework (or equivalent rules/contract approach).
  • Build and maintain ledger-posting logic that is accurate, auditable, idempotent, and aligned with accounting principles.
  • Configure product parameters and lifecycle states (e.g., onboarding, maturity, closures, arrears, write-off).
  • Implement financial events and schedules (interest accrual, compounding, billing cycles, statement generation triggers).
• Platform Integration & APIs
  • Develop integration services and APIs for channels and downstream systems (payments, KYC, CRM, GL, data/analytics, fraud, notifications).
  • Implement event-driven integrations (pub/sub, streaming) and ensure robust error handling, retries, reconciliation, and observability.
  • Collaborate on data models, reporting extracts, and controls required for Finance, Risk, and Regulatory needs.
• Quality, Controls & Delivery
  • Write comprehensive tests (unit, integration, contract), including edge cases and reconciliation scenarios.
  • Support product releases through CI/CD pipelines and controlled promotion (dev → test → prod).
  • Troubleshoot production issues with a focus on root-cause analysis, stability, and improved runbooks.
  • Maintain clear technical documentation (product specs, decision records, operational playbooks).
• Collaboration
  • Partner with Product Owners and SMEs to translate banking requirements into implementable designs.
  • Work with Security and Risk teams to ensure controls, audit trails, segregation of duties, and compliance-by-design.
  • Contribute to engineering standards, reusable components, and platform accelerators.

Experience and Key Competencies

• Knowledge & Experience
  • 5+ years developing APIs/integration services in regulated enterprise environments; banking or financial services experience strongly preferred.
  • BA/MBA in IT or relevant experience of 10+ years in Integration technology and Core Banking.
  • Proven experience delivering core banking products on Thought Machine or a comparable modern core/ledger platform.
  • Strong understanding of double-entry accounting concepts, ledgers, postings, balances, and reconciliation.
  • Experience implementing product features such as fees, interest, limits, repayment schedules, and lifecycle events.
  • Direct experience with Thought Machine Vault (product configuration, contract-style logic, lifecycle events).
  • Experience with payments (SEPA, Faster Payments, SWIFT), card processing, or transaction monitoring patterns.
  • Knowledge of regulatory reporting and controls (audit trails, model governance, policy-as-code).
  • Experience with test automation for financial logic (golden datasets, reconciliation harnesses, simulation testing).
  • Familiarity with data platforms (e.g., SQL, Snowflake/BigQuery, ETL/ELT pipelines) for reporting and analytics.
• Engineering Fundamentals
  • Strong software engineering background in one or more of: Python, Java, Kotlin, Go, or similar.
  • Experience building APIs and integration services (REST/gRPC), plus familiarity with event-driven architectures (Kafka or equivalent).
  • Solid grasp of software design principles, version control (Git), and testing practices.
• Cloud & Operability
  • Experience working in cloud-native environments (AWS/Azure/GCP), containers (Docker), and CI/CD.
  • Familiarity with observability practices: logs, metrics, tracing, SLOs, and production support patterns.
  • Strong problem-solving skills with a disciplined approach to debugging and incident response.
• Personal Attributes
  • Highly organised, proactive, and detail-oriented, with the ability to operate at pace.
  • Comfortable operating in ambiguity and adapting to changing priorities.
  • Resilient, calm under pressure, and confident acting as an extension of the CIO.
  • Trusted partner with a collaborative, inclusive leadership style.
  • Banking domain knowledge: payments (SEPA/SWIFT), card processing, transaction monitoring, AML/KYC, customer onboarding.
  • Exposure to 4th generation banking platforms such as Thought Machine or 10X.
  • Experience with service mesh (Istio/Linkerd) and zero trust patterns.
  • Familiarity with TOGAF, enterprise integration architecture, or API product management.
  • Experience with data privacy and retention requirements (GDPR), and operational controls.

Key Competencies

• Communications & Relationships
  • Excellent communication skills required to manage third party relationships. Ability to use insights and relationships to influence and deliver.
  • The ability to build connections and partnerships within own business area and beyond, through formal and informal channels, utilising considerable tact, diplomacy and people skills.
• Agility and innovation
  • Adapt quickly to changing priorities; create new and better ways for the organization to be successful.
• Collaboration
  • Build partnerships and promote a culture of teamwork to drive on U.S. Bank.
• Drive for results
  • Hold self and others accountable to consistently achieve meaningful results.
• Ethics and trust
  • Maintain high ethical standards; gain the confidence and trust of others through honesty, integrity and authenticity.
• Inclusion
  • Build a culture of equity and inclusion in which diverse ideas, talent and perspectives are welcomed and encouraged.
• Customer centricity
  • Build strong customer relationships and deliver customer-centric solutions.
• Commercial Judgement
  • Strong knowledge of business unit with the ability to understand USBE’s business and deliver the business performance needed to achieve USBE’s purpose and goals.
• Managing Programs
  • Proven analytical, decision-making and problem-solving skills, with the ability to plan and implement appropriate measures to mitigate the impact of an event affecting USBE’s ability to achieve its objectives.
  • To complete day-to-day activities in a manner which is consistent with legal, regulatory and stakeholder expectations.

Location expectations

This role requires working from a U.S. Bank location three (3) or more days per week.

Accessibility

We are committed to providing an inclusive and accessible recruitment experience. If you need adjustments at any stage of the application or hiring process, please contact your recruiter for guidance and support.

Total Rewards

U.S. Bank is committed to fair, equitable, and transparent compensation practices in line with local regulatory and legal requirements. Our total rewards approach is designed to attract, retain, and support top talent while ensuring equal pay for work of equal value. We offer a market-competitive compensation package that includes:

• Clearly defined salary ranges aligned with industry benchmarks and internal equity standards.
• Performance-based incentives for eligible employees (as defined by relevant plan rules), awarded through transparent, objective criteria that recognize both individual and company performance.
• Inclusive equitable benefits that are accessible to all employees and focused around our 3 main pillars of financial wellbeing, health & wellness.
• Continuous development opportunities including training, education support and career progression pathways based on inclusive and transparent criteria.
• Employee recognition programs that celebrate achievements and milestones for all.

Closing Date

Posting may be closed earlier due to high volume of applicants. We aim to provide timely updates throughout the process and encourage early applications to ensure consideration.