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About the Role

We are seeking a motivated and technically skilled Onboarding and Client Services Associate to join our London team. This role will focus on FIX client onboarding, integrations, and client service delivery across FX, equities and digital assets. The successful candidate will work closely with clients and internal teams to ensure seamless connectivity, smooth integration, and exceptional service throughout the client lifecycle.

Responsibilities

Lead and manage FIX client onboarding projects — from initial requirements gathering through certification and production go-live.
Configure, test, and validate FIX sessions, including order routing, execution reporting, and market data flows.
Coordinate conformance testing and certification with clients to ensure compliance with platform standards.
Document onboarding procedures, client configurations, and integration best practices.
Leverage internal AI and automation tools to streamline client onboarding and troubleshooting.
Collaborate with engineering and product teams to support new FIX workflows, APIs, and client integration initiatives.
Serve as a frontline technical support for clients in EMEA across FX and equities business lines.
Build and maintain strong client relationships, ensuring timely and transparent communication addressing their needs and queries with professionalism and efficiency.
Provide ongoing technical and operational support for production trading environments.
Manage client inquiries, troubleshoot workflow or configuration issues, and coordinate resolutions across internal teams.
Partner with account management, sales and product teams to ensure a positive client experience and successful delivery of platform enhancements.

Requirements

3+ years of experience in a client onboarding, integration, or technical support role within a financial technology, trading, or brokerage environment.
Strong working knowledge of the FIX protocol — message structures, session management, and common trading workflows.
Proven experience troubleshooting FIX connectivity, analysing logs, and resolving integration issues.
Familiarity with FX and Equities trading environments, order lifecycle management, and market data connectivity.
Comfortable with (or curious about) automation and AI-assisted tooling in an operational context.
Excellent communication and organisational skills, with strong attention to detail and the ability to manage multiple onboarding/client projects in parallel.
Candidates must have the existing right to work in the UK.
We are not currently able to offer visa sponsorship for this role.

Skills

FIX protocol
Client onboarding
Integrations
Client service delivery
FX
Equities
Digital assets
Technical support
AI and automation tools
Communication skills
Organisational skills
Attention to detail
OMS/EMS platforms
Liquidity aggregators
Trading system integrations
REST APIs
WebSocket APIs
Scripting
Python
Monitoring tools
Splunk
Grafana
Financial market structure
Post-trade workflows

Location

London, UK

Work Type

Hybrid
Full-Time

Experience Level

3+ years of experience

Benefits

Up to 30 days leave + bank holidays
Private health insurance
Pension
Life insurance
Dental/optical cashback
Cycle to work
Socials and offsites

About the Company

Reactive Markets is the 2026 OTC Trading Platform of the Year (Risk.net).
Our network handles billions in daily trading volumes across FX, Equities, and Cryptocurrency, connecting 35+ of the world's leading liquidity providers.
We build trading systems that operate at the edge of what's technically possible — where nanoseconds matter and a dropped message costs real money.
Our engineering team is small, senior, and deeply invested in the craft of building reliable, high-performance systems.

Equal Opportunity

Reactive Markets is an equal opportunities employer.
We welcome applications from all qualified candidates regardless of age, disability, gender reassignment, marriage or civil partnership, pregnancy or maternity, race, religion or belief, sex, or sexual orientation.
If you need any adjustments or support during the application or interview process, please let us know — we're happy to accommodate.