BackEnd Engineer (Java)

Ambush; Porto Alegre; Presencial; BRL 100.000 - 130.000; Tempo integral

Resumo da oferta

A forward-thinking technology company based in Porto Alegre is seeking a skilled Java Developer. The role involves creating high-performance, reactive mid-tier services for seamless payment experiences. Ideal candidates will possess expert-level Java programming skills, a strong background in reactive systems, and experience designing REST APIs. This role requires teamwork and effective communication in English, offering an environment focused on collaboration and long-term growth.

Qualificações

• Expert-level Java 17+ programming skills required.
• Minimum of 1 year working with reactive systems or payment/fintech platforms.
• Strong understanding of object-oriented design and design patterns.

Responsabilidades

• Design and implement reactive workflows using FluentWorkflow pattern.
• Integrate with external services like VaultAPI and Risk APIs.
• Build and maintain RESTful APIs following OpenAPI specifications.

Conhecimentos

Java 17+

Reactive Systems

REST APIs

Git

CI/CD Pipelines

Object-oriented Design

Functional Programming

Multi-threaded Programming

Descrição da oferta de emprego

Ambush is a people first company where talented, thoughtful individuals come together to build meaningful products and lasting partnerships. We believe the best work happens when people feel supported, trusted and empowered to bring their full abilities to the table. Since 2015, because of our people first and long term mindset, we have grown into a partner relied on by some of the best companies in the world. We combine strong engineering, design and strategy with a growing strength in AI to help our clients see what is next and achieve bigger outcomes. At the heart of everything we do is our team. We collaborate, take risks, lift each other up and take pride in doing work the right way, not settling for a quick makeshift solution. If you join Ambush, you join a group of people who want you to succeed and who show up for each other every day. We believe in and expect real teamwork, a constant drive to be better, and delivering meaningful long term outcomes that we can be proud of together.

This role focuses on building and maintaining a high-performance, reactive mid-tier service that powers seamless payment experiences for millions of users. We’re looking for a Java developer with strong backend fundamentals and hands-on experience building scalable, reactive systems, ideally in payments or fintech environments.

When you join us, you will:

• Design and implement reactive workflows using FluentWorkflow pattern.
• Integrate with external services (VaultAPI, Identity Services, Risk APIs).
• Build and maintain RESTful APIs following OpenAPI specifications.
• Debug production issues in distributed reactive systems.
• Write comprehensive unit and integration tests.
• Participate in code reviews and architectural discussions.
• Optimize application performance and scalability.
• Ensure security best practices and PCI compliance.
• Collaborate with cross-functional teams on feature development.

Communicate in English on a daily basis, both verbally and in writing.

What we'd like to see in a candidate:

• Expert-level Java 17+ programming skills.
• At least 1 year working with reactive systems or payment/fintech platforms.
• Proven experience debugging and maintaining complex distributed systems.
• Strong experience designing and implementing REST APIs.
• Experience with Git version control.
• Experience with CI/CD pipelines (Jenkins or similar).
• Strong understanding of object-oriented design, SOLID principles, and design patterns.
• Solid knowledge of functional programming concepts (lambdas, streams, Optionals).
• Experience with concurrent and multi-threaded programming.
• Knowledge of memory management and performance optimization.

Reactive Programming skills:

• Proficiency with Project Reactor (Mono / Flux).
• Strong understanding of the Reactive Streams specification.
• Experience with asynchronous and non-blocking programming patterns.
• Knowledge of backpressure handling and error recovery strategies.
• Experience with reactive composition and transformation operators.