Data Architect

Roles: Data Architect Location: London, UK Is it Permanent/ Contract: Open for both Is it Onsite/Remote/Hybrid: for London (4 days WFO, 1-day WFH mandatory) Experience 15+ years About the Role: We are seeking a senior Data Architect to join the engineering organisation as part of Project Compass. This programme is delivering next-generation capabilities across Accounts (Real-Time Ledger), Payments Engine, and Foreign Exchange – all of which generate, consume, and depend on high-quality, well-governed data at scale. The Data Architect will own the end-to-end data architecture across spanning Snowflake as the enterprise data warehouse and a landscape of in-house application databases (relational, time-series, document, and in-memory stores) that serve real-time operational workloads. You will define how data flows from source systems into the warehouse, how application databases are modelled and managed, and how data products are exposed to downstream consumers within and beyond . This is a hands-on, delivery-focused role. You will work closely with Integration Architects, platform engineers, and domain product teams to translate business data requirements into durable, governed, and scalable data solutions. Key Responsibilities Data Architecture & Strategy Define and own the data architecture target state, covering the Snowflake enterprise data warehouse, application databases, and the data flows that connect them Establish a unified data modelling standard across relational (PostgreSQL, Oracle), in-memory (Redis), time-series (TimescaleDB / InfluxDB), and document (MongoDB) stores used by applications Design the data ingestion and movement architecture – real-time CDC pipelines, batch ETL/ELT patterns, and event-driven feeds from the NATS messaging layer into Snowflake Define data domain boundaries, ownership, and lineage standards aligned with Project Compass product domains (RTL, Payments, FX) Produce and maintain authoritative data architecture artefacts: entity-relationship models, data flow diagrams, data dictionaries, and Architecture Decision Records (ADRs) Snowflake & Data Warehouse Lead the design and evolution of the Snowflake data warehouse, including schema design (Raw / Conformed / Consumption layers), virtual warehouse sizing, and cost governance Define standards for data loading (Snowpipe, Streams & Tasks, external stages), transformation (dbt patterns), and data sharing across business units Establish Snowflake data access controls, row-level security, dynamic data masking, and PII governance in line with regulatory requirements (GDPR, BCBS 239) Champion Snowflake best practices for performance tuning, clustering keys, materialised views, and query optimisation Evaluate Snowflake-native capabilities (Snowpark, Cortex AI, Dynamic Tables) and recommend adoption where they accelerate data product delivery Application Database Architecture Govern the application database landscape across – reviewing schema designs, indexing strategies, and data lifecycle management across all in-house databases Define patterns for operational data stores (ODS) that bridge real-time application databases and the analytical warehouse layer Ensure consistency between transactional data models and their warehouse representations, minimising transformation complexity and maximising fidelity Set standards for database change management, migration tooling (Liquibase / Flyway), and schema versioning across the application estate Identify and remediate data quality issues at source, defining data contracts between application teams and downstream consumers Data Governance & Quality Define and implement data governance frameworks covering data ownership, stewardship, classification (PII, sensitive, public), and retention policies Establish data lineage and cataloguing standards, working with tooling such as Apache Atlas, Collibra, or Snowflake Horizon Catalog Design and enforce data quality rules and SLAs at ingestion, transformation, and consumption layers Collaborate with the Risk and Compliance function to ensure data architecture meets BCBS 239 Risk Data Aggregation and Reporting requirements Champion Master Data Management (MDM) principles for shared reference data (counterparty, instrument, currency) across domains AI, Analytics & Data Products Define the architecture fordata products – curated, well-documented datasets served to analytics, reporting, and AI/ML consumers Design feature stores and data pipelines that support AI/ML model training and inference for use cases such as FX pricing, payment anomaly detection, and limit utilisation forecasting Evaluate and integrate AI-assisted data tooling (AI-powered cataloguing, natural language querying, automated data quality) where it accelerates productivity Partner with the Analytics Engineering team to establish dbt modelling standards, testing frameworks, and documentation practices Collaboration & Leadership Work hands-on across multiple product teams as a data authority, balancing strategic design with direct delivery contribution Guide and mentor application engineers on data modelling, query optimisation, and data quality best practices Engage senior stakeholders across Technology, Finance, Risk, and Operations to communicate data strategy, risks, and trade-offs Facilitate data architecture working groups with platform, BI, and enterprise architecture teams to align on shared standards Core Technical Skills  Data Warehouse Snowflake – schema design, Snowpipe, Streams & Tasks, Snowpark, dynamic data masking, cost governance Transformation dbt (data build tool) – modelling layers, testing, documentation, incremental strategies Application Databases PostgreSQL, Oracle, Redis, MongoDB, TimescaleDB / InfluxDB – schema design, indexing, replication Data Integration CDC (Debezium / Kafka Connect), ETL/ELT pipelines, NATS event feeds, AWS Glue, Apache Spark Cloud Platform AWS – S3, RDS, Aurora, Redshift (migration context), Glue, Lake Formation, IAM, VPC Data Governance Data lineage, cataloguing (Apache Atlas / Collibra / Snowflake Horizon), GDPR, BCBS 239, MDM Architecture Practice ERDs, data flow diagrams, data contracts, ADRs, C4 modelling, domain-driven data design AI / ML Data Feature stores, ML pipeline data design, Snowflake Cortex AI, vector stores, LLM data patterns Query & Performance SQL optimisation, clustering keys, partitioning, query profiling, cost-based tuning Data Landscape The Data Architect will work across the following technology landscape. Candidates should have direct experience with the majority of these platforms and the ability to define coherent architecture across heterogeneous stores:  Platform / Store Primary Use : Key Architecture Concerns Snowflake Enterprise data warehouse, analytics, reporting, data sharing Layer design, ingestion patterns, security, cost governance PostgreSQL Transactional data – ledger entries, client records, audit Schema design, CDC, replication lag, index strategy Oracle DB Legacy core banking integration, reference data Migration strategy, data contracts, schema versioning Redis Real-time caches – FX rates, limit state, session data Cache invalidation, persistence strategy, data consistency MongoDB Document stores – client profiles, trade enrichment data Schema evolution, aggregation pipelines, CDC integration TimescaleDB Time-series – market data ticks, position history Hypertable design, retention policies, compression NATS JetStream Event streaming – payments, ledger events, FX confirmations Event schema contracts, consumer group design, replay strategy AWS S3 / Glue Data lake staging, archival, batch ingestion into Snowflake Partitioning, file format (Parquet/ORC), Lake Formation governance Finance Domain Knowledge Candidates should have hands-on data architecture experience in one or more of the following financial services domains:  Domain Key Data Concepts Real-Time Ledger Double-entry accounting data models, event-sourced ledgers, real-time balance aggregation, reconciliation datasets Payments Engine Payment message data (ISO 20022 / SWIFT), settlement instructions, payment status lifecycle, fee and charge data Foreign Exchange Trade data models, rate feeds and time-series storage, position keeping, P&L attribution data Limit Management Exposure data models, limit hierarchy, breach event data, real-time risk aggregation feeds Client Onboarding Client master data, KYC / AML data structures, account hierarchy, regulatory reporting feeds Regulatory Reporting BCBS 239 data lineage, EMIR / MiFID trade reporting data, data quality SLAs for regulatory submissions Experience & Profile 15+ years of progressive technology experience, with at least 5 years in senior data architecture roles Deep, hands-on experience with Snowflake as an enterprise data warehouse – ideally holding Snowflake SnowPro Core or Advanced: Architect certification Proven track record of designing data architectures across heterogeneous application database landscapes in large financial institutions or fintech organisations Demonstrated experience implementing data governance frameworks, lineage tooling, and data quality programmes at programme scale Comfortable working hands-on – writing dbt models, reviewing SQL, profiling queries – while operating at senior stakeholder and architecture level Experience with CDC-based real-time data pipelines and event-driven data integration patterns Strong communicator able to convey complex data architecture decisions to both engineering teams and business stakeholders Familiarity with AI/ML data architecture patterns (feature stores, vector databases, LLM data pipelines) is a strong advantage AWS Solutions Architect or AWS Data Analytics certification is advantageous.