Java Engineer – Backend & Search Platform
Location: London, UK
**PLEASE NOTE SPONSORSHIP IS NOT PROVIDED FOR THIS ROLE - MUST HAVE FULL RIGHT TO WORK IN THE UK **
About the Role
You’ll be working on a large‑scale backend platform that powers advanced search, data processing, and high‑performance API experiences. The environment involves significant volumes of structured and unstructured data, low‑latency requirements, and distributed systems operating at scale. The work spans backend services, search capabilities, data ingestion, and graph‑driven features. You’ll contribute to systems that must remain fast, resilient, and highly available.
What You’ll Work On
Build and maintain backend services using Java / Spring
Design and optimise APIs using GraphQL and REST
Develop search functionality using Elasticsearch
Work with large‑scale data models across multiple storage technologies
Contribute to ingestion pipelines that process high‑volume datasets
Improve platform performance, reliability, and observability
Integrate semantic or ML‑driven components into backend services
Deploy and operate services in AWS using modern cloud toolingKey Tech Stack
Java 17+
Elasticsearch / GraphQL
AWSWho You Are
Strong Java engineer with experience building distributed backend systems
Comfortable with Elasticsearch (indexing, querying, relevance)
experience with GraphQL or graph‑oriented APIs
Familiar with AWS cloud environments
Understands data modelling across document, graph, and key‑value stores
Enjoys solving complex search and data‑intensive engineering problems
Works well in cross‑functional engineering environments
Job Title: Backend Java Engineer
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