Java Engineer

We are looking for a Java Engineer with strong backend development experience and a passion for building scalable Shopify integrations.

At Mindera, you will help design and deliver backend systems that power next-generation e-commerce experiences - connecting Shopify with enterprise platforms through well-architected APIs and event-driven designs.

You will focus on architecture, API design, mentoring, and delivery - blending technical excellence with practical execution. This is a great opportunity for engineers who love crafting elegant systems, care about code quality, and enjoy solving real-world integration challenges.

- Design and implement Java-based backend services (Micronaut preferred) for Shopify integration and related e-
commerce workflows.
- Architect and document APIs using OpenAPI / AsyncAPI specifications, ensuring clarity, versioning, and
scalability.
- Implement Shopify integration patterns including webhooks, event-driven communication, and
synchronization of products, orders, and fulfillment.
- Build RESTful APIs and Kafka-based event pipelines, supporting reliable, decoupled services.
- Apply domain-driven design (DDD) and event-driven architecture (EDA) to ensure maintainable and
extensible codebases.
- Create and maintain reusable backend components (e.g., Catalogue Validator, Pricing Service, Notification Engine).
- Mentor junior developers in Java design principles, code reviews, and testing best practices.
- Contribute to CI/CD pipelines, improving automation, observability, and release reliability.
- Champion code quality, ensuring standards for linting, formatting, and secure coding are consistently
- Collaborate with cross-functional teams (frontend, QA, DevOps, and product) to deliver features end-to-end.

Requirements

Core Technical Skills Backend
Development:
- Java (8+) with frameworks like Micronaut (preferred) or Spring Boot.
- Strong knowledge of Gradle, REST, and Kafka scaffolding.
- Experience with service health checks, observability, and performance tuning.

API Design & Integration:
- Hands-on experience with OpenAPI / AsyncAPI documentation and design-first development.
- Expertise in Shopify APIs (Admin API, Storefront API, Webhooks).
- Solid understanding of authentication, rate limiting, and API orchestration patterns.

Testing & Quality:
- Proficient with JUnit, Mockito, and Contract testing tools.
- Strong emphasis on unit testing, mocking strategies, and code coverage metrics.
- Experience with test data generation and automation frameworks.

Architecture & Patterns:
- Deep understanding of Domain-Driven Design (DDD) and Event-Driven Architecture (EDA).
- Ability to design modular, reusable components and shared libraries.
- Experience designing resilient, scalable systems across distributed environments.

Dev Standards & Governance:
- Advocates for clean code principles - linting, formatting, and code review culture.
- Applies secure coding and governance standards for enterprise-grade software.
- Familiarity with CI/CD pipelines, GitHub Actions or Jenkins, and infrastructure as code (IaC) workflows.

Nice-to-Have Skills
- Experience with Shopify Plus, custom app development, or Shopify Functions.
- Familiarity with Docker/Kubernetes and AWS cloud deployments.
applied to monitoring and alerting tools like Prometheus, Grafana, or New Relic.
- Prior involvement in mentoring teams, contributing to architecture discussions, and driving technical delivery.

Profile
- Hands-on engineer with a deep understanding of backend architecture and Shopify ecosystems.
- Strong communicator who enjoys mentoring, guiding design discussions, and improving engineering quality.
- Thrives in collaborative, agile environments - values autonomy, responsibility, and continuous improvement.
- Passionate about building software that's both technically sound and business impactful.

We'd love to get to know you better

Benefits

• Fun, happy and politics-free work culture built on the principles of lean and self organisation;
• Work with large scale systems powering global businesses;
• Competitive salary and benefits.

At Mindera we use technology to build products we are proud of, with people we love.

Software Engineering Applications, including Web and Mobile, are at the core of what we do at Mindera.

We partner with our clients, to understand their product and deliver high performance, resilient and scalable software systems that create an impact in their users and businesses across the world.

You get to work with a bunch of great people, where the whole team owns the project together.

Our culture reflects our lean and self-organisation attitude. We encourage our colleagues to take risks, make decisions, work in a collaborative way and talk to everyone to enhance communication.

We are proud of our work and we love to learn all and everything while navigating through an Agile, Lean and collaborative environment.

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Our offices are located: Aveiro, Portugal | Porto, Portugal | Leicester, UK | San Diego, USA | San Francisco, USA | Chennai, India | Bengaluru, India