Senior Back-end Engineer (Crypto and Fiat Payments) (iGaming)

SweepTech iGaming Solutions; Düsseldorf; Remote; EUR 60.000 - 90.000; Vollzeit

Zusammenfassung

A leading iGaming solutions provider in Düsseldorf seeks a Senior Back-end Engineer to develop secure payment solutions bridging blockchain and fiat systems. The role requires extensive experience in Node.js and TypeScript, and proficiency in PostgreSQL. Ideal candidates will have a strong background in integrating cryptocurrency payment gateways and working in remote teams. This position emphasizes security and efficient transaction processing.

Qualifikationen

• 5+ years in back-end development, expertise in Node.js and TypeScript.
• Experience integrating crypto payment gateways and RPC Node Providers.
• Proficiency in PostgreSQL schema design and optimization.
• Knowledge of distributed systems and microservices.
• Fluency in English and either Ukrainian or Russian.

Aufgaben

• Develop and maintain back-end services for payment processing.
• Integrate cryptocurrency and fiat payment gateways.
• Architect event-driven systems for transaction monitoring.
• Collaborate with front-end teams to define APIs.
• Conduct code reviews and implement observability tools.

Kenntnisse

Node.js

TypeScript

PostgreSQL

Redis

Docker

Kubernetes

WebSockets

English

Ukrainian

Russian

Tools

CI/CD pipelines

NATS

GitLab

Turborepo

Jobbeschreibung

Overview

As a Senior Back-end Engineer, you’ll lead the development of secure, high-throughput payment solutions that bridge blockchain and fiat ecosystems for our cutting-edge Skin Gambling and Casino Platform. Your expertise will directly enable seamless cross-chain operations and drive the future of digital financial services in a collaborative, globally distributed environment.

Required Qualifications

• 5+ years of professional back-end development experience with Node.js and TypeScript in production environments. Proven expertise in integrating crypto payment gateways and fiat processors.


• Hands-on experience with integration of RPC Node Providers (e.g., Infura, Alchemy) for cross-chain operations (ERC-20/BEP-20/TRC-20 tokens).


• Proficiency in PostgreSQL, including schema design, optimization, and ORM tools (Drizzle or equivalent).


• Strong knowledge of distributed systems using Redis, message brokers (NATS/Kafka), and real-time protocols (WebSockets).


• Experience deploying microservices via Kubernetes, Docker, and CI/CD pipelines (GitLab/GitHub Actions).


• Familiarity with monorepo management tools (e.g., Turborepo, Nx).


• Fluency in Ukrainian or Russian and proficiency in English for technical collaboration in a remote/global team setting.


• Ability to work within the CET/EET time zone.

Your Advantage

• Prior integration experience with ZEN.com’s payment ecosystem.


• Experience with Skin/NFT Gambling or Online Casinos.


• Exposure to front-end technologies like React, Next.js, and state management (MobX/Redux).


• Previous experience working in a start-up environment with rapid iteration cycles.

Key Responsibilities

• Design, develop, and maintain scalable back-end services for crypto and fiat payment processing using Node.js, TypeScript, and PostgreSQL.


• Integrate and optimize payment gateways for cryptocurrencies (ERC-20/BEP-20/TRC-20) and traditional fiat systems, ensuring secure and low-latency transactions.


• Implement cross-chain payment solutions by interfacing with RPC Node Providers for deposits, withdrawals, and balance synchronization.


• Architect event-driven systems leveraging NATS, Redis, and WebSockets for real-time transaction monitoring and notifications.


• Optimize database performance and integrity using Drizzle ORM, including complex querying and indexing strategies.


• Collaborate with front-end teams to define APIs and ensure seamless integration with React/Next.js applications (full-stack exposure).


• Establish CI/CD pipelines via GitLab and Turborepo, deploying containerized services (Docker) on Kubernetes clusters.


• Conduct code reviews, troubleshoot production issues, and implement observability tools for system health monitoring.


• Drive security best practices for payment handling, including encryption, audit trails, and compliance checks.