OLTP Data Architect

London · Contract · Posted 29 October 2026

Data Architect – OLTP / Transactional Databases Great opportunity to join a large payments company working on a complex, high-volume transactional platform. Location: London or South East England – 3 days per week in…

Contract type Contract
Location London
Posted 29 October 2026

Trusted. Transparent. Built for contractors. Thousands of UK contractors find their next contract on ContractorUK.

View all IT & technology jobs ›

About this contract

Data Architect – OLTP / Transactional Databases

Great opportunity to join a large payments company working on a complex, high-volume transactional platform.

Location: London or South East England – 3 days per week in the office

Contract: 6-month initial contract, rolling

Rate: £300–£370 per day Umbrella

PLEASE NOTE: SPONSORSHIP IS NOT PROVIDED FOR THIS ROLE

Applicants must already have the right to work in the UK without requiring sponsorship.

What the role involves

Understanding and documenting a complex existing transactional platform
Designing OLTP and system-of-record databases
Creating conceptual, logical and physical data models
Defining data standards and maintaining architecture documentation
Working closely with developers and engineers to implement the architecture

Must have

Proven experience designing or modelling transactional / OLTP databases that have gone into production
Strong relational database design experience
experience with PostgreSQL, Oracle or SQL Server
Strong experience creating conceptual, logical and physical data models
Ability to produce clear technical documentation that developers and engineers can work from

Nice to have

experience with distributed or NoSQL databases such as Cassandra, Google Spanner, Yugabyte or MongoDB
Banking, financial services or payments experience
experience with modelling tools such as ER/Studio or ErwinReminder: this role does not provide sponsorship. Candidates must already have the right to work in the UK.

Job Title: OLTP Data Architect

Location: London, UK

Job Type: Contract

Trading as TEKsystems. Allegis Group Limited, Maxis 2, Western Road, Bracknell, RG12 1RT, United Kingdom. No. (phone number removed). Allegis Group Limited operates as an Employment Business and Employment Agency as set out in the Conduct of Employment Agencies and Employment Businesses Regulations 2003. TEKsystems is a company within the Allegis Group network of companies (collectively referred to as "Allegis Group"). Aerotek, Aston Carter, EASi, Talentis Solutions, TEKsystems, Stamford Consultants and The Stamford Group are Allegis Group brands. If you apply, your personal data will be processed as described in the Allegis Group Online Privacy Notice available at (url removed)>
To access our Online Privacy Notice, which explains what information we may collect, use, share, and store about you, and describes your rights and choices about this, please go to (url removed)>
We are part of a global network of companies and as a result, the personal data you provide will be shared within Allegis Group and transferred and processed outside the UK, Switzerland and European Economic Area subject to the protections described in the Allegis Group Online Privacy Notice. We store personal data in the UK, EEA, Switzerland and the USA. If you would like to exercise your privacy rights, please visit the "Contacting Us" section of our Online Privacy Notice at (url removed)/en-gb/privacy-notices for details on how to contact us. To protect your privacy and security, we may take steps to verify your identity, such as a password and user ID if there is an account associated with your request, or identifying information such as your address or date of birth, before proceeding with your request. If you are resident in the UK, EEA or Switzerland, we will process any access request you make in accordance with our commitments under the UK Data Protection Act, EU-U.S. Privacy Shield or the Swiss-U.S. Privacy Shield

Set up for this contract

ContractorUK partners
Markel Direct IR35 and contractor insurance

Most agencies and clients ask for professional indemnity and public liability before you start.

Get your quote →
SG Accounting Contractor accountants

Working through your own limited company? A contractor-specialist accountant keeps the admin off your desk.

Find out more → Also: Caroola · Dolan Accountancy · Compare all accountants

Get new IT contracts by email

One email when new matches appear. Unsubscribe with one click.

Prefer to be found? Upload your CV to CV-Library — free