Robert Half have partnered with a high growth sports manufacturing organisation based in London who are looking to engage an experienced Senior Backend Engineer to support the evolution of a live, transaction‑driven platform as it scales internationally.
This is an initial 6‑month, Inside IR35 contract, focused on building and scaling core backend systems that support global commerce, real‑time interactions, and the integration of newly acquired platform capabilities.
Responsibilities:
* Owning and evolving backend services within a high‑scale, real‑time environment
* Designing and scaling systems to support multi‑currency and cross‑border transactions
* Building and extending a shared transaction and ledger layer used across multiple platforms
* Supporting the integration of newly acquired products and capabilities into the core platform
* Designing and exposing APIs for frontend, mobile, and third‑party platform use cases
* Handling complex transaction logic including currency conversion, fees, reconciliation, and refunds
* Supporting region‑specific requirements such as tax, compliance, and shipping logic
* Improving performance, resilience, and scalability of transaction‑heavy systems
* Leading architectural decisions across backend and platform services
* Mentoring engineers and contributing to higher backend engineering standards
* Collaborating closely with frontend, mobile, and product teams to deliver global user experiences
Skills:
* Extensive experience working as a Senior Backend Engineer in production environments
* Strong background designing and building distributed systems and APIs
* Proven experience building or scaling payment, ledger, or transaction systems
* Experience working with Elixir and GraphQL (strongly preferred)
* Background in eCommerce or transaction‑heavy, real‑time platforms operating across regions
* Ability to evolve existing systems pragmatically in fast‑moving environments
* Comfortable operating with ambiguity and a strong sense of ownership
* Strong communication skills and experience working within cross‑functional teams
Contract:
* Initial 6‑month contract with potential to extend
* Inside IR35
* London‑based assignment with hybrid working (on‑site expectation)
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