Senior Backend Engineer (Remote) Castelo Branco

Overview

Venga: bridging innovative blockchain technologies to traditional finance

Venga is an app with a mission to take innovative blockchain technologies and bridge them to traditional finance inside a powerful centralized app, empowering people to effortlessly discover, invest, and navigate the world of Web3.

Who We're Looking For

We’re seeking a Senior Backend Engineer with expertise in Java/Spring ecosystems to architect the systems powering Venga’s financial infrastructure. You’ll design scalable microservices, build secure bridges between Web2 and Web3 technologies, and collaborate with functional teams to deliver robust solutions for both traditional finance and blockchain use cases. If you’re passionate about performance backend systems, join us in redefining finance.

What You’ll Be Doing

• Design and develop Java/Spring microservices to handle traditional finance workflows (payments, compliance).
• Integrate blockchain networks (Ethereum, Solana, etc. ) into Venga’s backend, interacting with nodes, indexers, and smart contracts.
• Architect-driven solutions with Apache Kafka to process
  - sensitive transactions, blockchain events, and user activity streams.
• Build and optimize RESTful APIs and Web
  Socket interfaces to power our
  - end app, backoffice tools, and partner integrations.
• Secure sensitive data using AWS KMS, Hashi
  Corp Vault, or MPC solutions, aligning with financial compliance standards.
• Collaborate in a functional squad to deliver
  -
  - end features, from ideation to deployment.
• Manage Postgre
  SQL databases, optimizing performance, security, and replication strategies for
  - volume financial data.
• Deploy and scale services on AWS using Kubernetes (k8s), ensuring efficient resource utilization and cost management.
• Implement robust security practices for financial systems, including encryption, authentication, and regulatory compliance.
• Mentor junior engineers, lead code reviews, and champion best practices in testing, CI/CD, and observability.
• Stay ahead of industry trends, exploring innovations in blockchain integration, native architectures, and tooling.

Who You Are & What You Need

• 4+ years of backend development experience in Java and expertise in the Spring ecosystem. Bonus if you have 2+ years integrating blockchain systems in production.
• Proven track record building microservices architectures in production, including service discovery, circuit breakers, and distributed tracing.
• Strong experience with Apache Kafka (event sourcing, stream processing) and Postgre
  SQL (performance tuning, replication, partitioning).
• Hands-on knowledge of Kubernetes and AWS.
• Expertise in designing RESTful APIs and time systems using Web
  Socket or similar protocols.
• Familiarity with fintech or blockchain integrations is a strong plus.
• Experience in regulated industries (e. g. , banking, crypto compliance) and tools like Vault, Hashi
  Corp, or AWS KMS is a bonus.
• Collaborative mindset: Thrive in functional teams and align technical decisions with business goals.
• Fluent English and Russian, with excellent communication skills for
  - functional teamwork.
• Passion for solving challenges in financial systems, scalability, and bridging Web3 with traditional finance.

Nice to have

• Familiarity with compliance, AML and regulation.
• ISO/IEC 27001 experience.

What we offer

• Full-Time Employment Contract.
• Own your time company culture - manage start and finish work times within each day.
• A brand new Mac
  Book or similar option of your choice.
• 25 vacation days (more than the Spanish norm).
• Exciting work in a dynamic, international, and growth startup.
• Remote, but you must be within a maximum time zone difference of 3 hours from Barcelona.
• A sunny office in Barcelona, less than 50 meters away from the beach!