Technical Lead (OMS, Java)

We are seeking a Technical Lead (OMS) to drive the technical side of a Discovery & Planning engagement for a new API-first Order Management System at a long-established UK omnichannel retailer of high-value goods. In this role, you will be the senior hands-on technical voice between the client’s IT leadership, the Fluent Commerce vendor and our Enterprise Architect, confirming platform fit, designing a domain-driven integration architecture and producing the estimates for an MVP build expected to start in early 2027.

Essential functions

• Technical Fit Assessment: Assess Fluent Commerce against roughly 120 business requirements, confirming what is out of the box, configuration, extension or custom build, and quantifying the effort for each.
• Integration Architecture: Design the target integration architecture with the Enterprise Architect across eCommerce, POS, ERP and stock, payments, carriers, marketplace partners and customer-service tooling, and show the client the cost of a domain-driven approach compared with point-to-point.
• Technical Workshops: Lead integration workshops with client IT on product, inventory, price, online and in-store orders, third-party partners, carriers, stores and payments, including sequencing with a new payment provider rollout.
• Fulfilment Without a WMS: Design interim pick, pack and despatch for stores and the distribution centre while no warehouse management system is in place, and surface the risks and options.
• Technical Design & Estimates: Author the Technical Design Guide (logical architecture, system context, non-functional requirements, data migration) and produce estimates by functional area with technical input to the MVP plan, rollout approach and test strategy.
• Build Leadership: Act as the technical counterpart to the OMS vendor and client IT, and be ready to lead the engineering team into the MVP build.

Qualifications

• Technical lead experience on at least one Order Management System implementation, ideally Fluent Commerce (workflows and rulesets, custom rules via the Fluent SDK in Java, GraphQL API); comparable OMS leadership with evidence of fast platform ramp-up is also considered.
• Retail Integration Design: Experience designing API- and event-based integrations for retail order flows, with idempotency and reconciliation built in.
• Java Backend Engineering: Strong hands-on Java skills, enough to set extension patterns and review custom OMS code.
• Design & Estimation: Ability to turn discovery findings into a technical design and defensible estimates, covering solution options, effort by functional area, technical risks and cost drivers.
• Technical Leadership & Communication: Confidence leading workshops with client IT and explaining architecture and cost trade-offs to a Head of Technology audience.
• English & Availability: Fluent spoken and written English, with daily overlap with UK business hours.

Would be a plus

• Commerce & Payments Integration: Experience with commercetools order and inventory integration with an OMS, and with Adyen or similar PSPs in order flows (capture on despatch, refunds, split tender).
• ERP & Logistics Integration: Experience integrating Microsoft Dynamics NAV / Navision or similar ERP for stock and finance, carrier and label integrations (e.g. Royal Mail, DPD), returns platforms and marketplace order feeds.
• Composable Architecture: Background in domain-driven design or integration abstraction layers for composable retail.
• Non-Functional Design: Experience designing for high availability (99.9%), RTO and RPO targets, audit, and order history migration.

We offer

• Opportunity to work on bleeding-edge projects
• Work with a highly motivated and dedicated team
• Competitive salary
• Flexible schedule
• Benefits package - medical insurance, sports
• Corporate social events
• Professional development opportunities
• Well-equipped office

About us

Grid Dynamics (NASDAQ: GDYN) is a leading provider of technology consulting, platform and product engineering, AI, and advanced analytics services. Fusing technical vision with business acumen, we solve the most pressing technical challenges and enable positive business outcomes for enterprise companies undergoing business transformation. A key differentiator for Grid Dynamics is our 8 years of experience and leadership in enterprise AI, supported by profound expertise and ongoing investment in data, analytics, cloud & DevOps, application modernization and customer experience. Founded in 2006, Grid Dynamics is headquartered in Silicon Valley with offices across the Americas, Europe, and India.