Mid/Senior Backend Engineer (Java)

Mid Backend Engineer (Java)

Payments Orchestration | Greenfield Gaming PlatformCONTRACTB2BLOCATIONRemote / Poland

• WORKSHOPS
• Kraków
• STARTASAP / agreed dateB2B RATE120–150 PLN/h + VAT
• Final rate depends on seniority, payments experience and technical fit.

The Mission

West Code is building a new engineering team for a greenfield international gaming platform. The Payments team will own payment orchestration and integrations with external payment providers.

You will work on backend services where reliability, transaction consistency and failure handling matter as much as clean code. This is a hands-on role with real influence on technical design and implementation from the beginning.

What You’ll Buildpayment orchestration services with Java 21+ and Spring Boot 3provider / PSP integrations and a consistent integration layertransaction flows such as deposits, withdrawals, refunds, reversals and status handlingrouting, retry, timeout and fallback mechanismsidempotency and duplicate-event protectionasynchronous callbacks / webhooks and event-driven flowsreconciliation and transaction-state consistencyhigh-volume, highly available services with strong observability

• Must Have4+ years of backend engineering experiencestrong Java and Spring Bootexperience with microservices and distributed systems
• Kafka or a similar messaging platform
• REST APIs and external system integrationsSQL / PostgreSQL or similar relational database experience
• Docker and CI/CDexperience working with production systemsgood English and ability to work independently
• Strong Advantagehands-on experience with payments, payment gateways, PSPs or fintechpayment orchestration, provider adapters or routing logicidempotency, retries, callbacks, reconciliation or transaction state machineswallets, high-volume transactional systems, e-commerce or marketplacesi
• Gaming, sportsbook or online casino
• Kubernetes and AWS
• Kotlin or Scala
• Open
• Telemetry, Prometheus, Grafana or similar observability tooling
• Engineering Environment
• Java 21+
• Spring Boot 3
• Kafka
• PostgreSQL
• Docker
• Kubernetes
• AWS
• REST APIs
• Open
• Telemetry
• CI/CD
• Working ModelB2B cooperationremote work from Polandinitial workshops in Kraków and follow-up onsite sessions approximately once per quarterinternational team with English used on the projectgreenfield delivery with direct access to senior technical leadershipWhy West CodeAt West Code, we build engineering teams around ownership and strong technical delivery, not just individual roles.

You’ll join a real greenfield platform build, influence technical decisions and work on problems where payments, reliability and distributed-system design genuinely matter. Our delivery environment also uses AI-assisted engineering workflows to support code quality, security, requirements context and knowledge transfer.

Sounds like your kind of project? Apply and let’s talk.