Senior Software Engineer, Java
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Job Description
Senior Software Engineer developing backend services for a fintech company with a focus on Web3 technologies. Responsible for delivery of core systems supporting wallet operations and blockchain integrations.
Responsibilities:
- Implement and operationalize core backend services with fault tolerance, security, and scalability.
- Build API-first services integrating blockchain networks, third-party provider solutions, and internal systems with strong consistency guarantees.
- Implement secure service communications using cryptographic signatures, key management, and zero-trust architecture principles.
- Operationalize event-driven systems using Apache Kafka and asynchronous messaging patterns.
- Build highly available, strongly consistent, horizontally scalable services.
- Implement robust concurrent and asynchronous processing patterns for multi-threaded workloads.
- Integrate Web3 SDKs and libraries for on-chain interactions, transaction signing, and state monitoring.
- Implement structured logging, distributed tracing, metrics, and OpenTelemetry instrumentation.
- Produce and maintain high test coverage via automated unit, integration, and functional testing frameworks within CI/CD pipelines.
- Produce and maintain technical documentation, API specifications, and operational runbooks.
Requirements:
- 7 or more years of software engineering experience building and operating production-grade backend systems in regulated financial or enterprise environments.
- Extensive hands-on proficiency in Java and Spring Boot.
- Comfort operating across polyglot stacks.
- Deep expertise in API-first design, RESTful service contracts, and microservices architecture patterns.
- Strong command of concurrent, multi-threaded, and asynchronous programming models.
- Proven track record delivering highly available, strongly consistent, and distributed applications.
- Hands-on experience building event-driven solutions using Apache Kafka.
- Solid understanding of messaging patterns including pub/sub, event sourcing and saga/choreography orchestration.
- Strong understanding of CI/CD, DevSecOps practices, secure SDLC, and automated security controls.
- Hands-on experience with OpenTelemetry, distributed tracing, and observability platforms.
- Strong technical writing skills; demonstrated ability to produce API specs and runbooks.
- Nice to Have: Extensive hands-on proficiency in TypeScript, Node.js, and/or NestJS.
- Direct experience with Ethereum, Bitcoin, Solana, XRPL, and other distributed ledger technologies.
- Familiarity with MPC (Multi-Party Computation), HSMs, and enterprise key management systems.
- Experience implementing Zero Trust security architecture end-to-end.
- Knowledge of tokenization, stablecoins, settlement systems, and digital asset operations.
- Contributions to open-source blockchain projects or Web3 tooling.
- Experience with AI-assisted development workflows and LLM-powered tooling.
Benefits:
- International experience in a stable company: the company has offices in Antwerp, Leuven, Lisbon, Krakow, Kyiv, New York and operates on the market for over 15 years.
- Passionate team in an innovative casual, positive, and open work environment ready to meet your new ideas.
- Great opportunities for personal and professional development as well as the chance to change the way the business works in the financial world.
- Work where you're most productive: remote, in-office, or hybrid options available.
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