This is us

At Avenga, we believe that human creativity empowers technology that matters. Operating globally, our 6000+ specialists provide a full spectrum of services, including business and tech advisory, enterprise solutions, CX, UX and Ul design, managed services, product development, and software development.

This is the job

We are looking for a Principal Java Engineer to take a leading role in the design and evolution of complex, enterprise-grade backend platforms. You will act as a technical authority, driving architectural decisions, setting engineering standards, and ensuring the delivery of secure, scalable, and highly reliable systems in a regulated environment. This role combines deep technical expertise, architectural ownership, and close collaboration with business and technical stakeholders.

This is you

• 10+ years of backend engineering experience, with a strong track record in Java and Spring Boot

• Proven experience as a Principal Engineer or Solution Architect on complex enterprise platforms (preferably in regulated domains)

• Strong knowledge of Kubernetes runtime and deployment patterns; experience with OpenShift is highly valued

• Demonstrated expertise in event-driven architecture (e.g., Kafka), including schema/versioning strategy, idempotency, retries, and delivery guarantees (exactly-once vs at-least-once)

• Deep understanding of distributed systems – consistency models, latency, resiliency, circuit breaking, backpressure, and operational reliability

• Strong security background, including mTLS, API security, and secure engineering practices

• Hands-on experience integrating OAuth 2.0 / OpenID Connect and SSO with external identity providers

• Ability to design systems for high performance and scalability, handling large datasets and peak usage patterns

• Demonstrated experience or strong motivation to use AI-assisted development tools to improve productivity and code quality, with disciplined review, traceability, and security considerations

• Bulgarian language proficiency is required

This is your role

• Drive solution architecture and key technical decisions together with business and technical stakeholders, ensuring cloud portability and long-term maintainability

• Define and enforce engineering principles and standards: API-first design, contract versioning, security-by-design, observability, resiliency, and performance

• Lead the design and development of microservices / service-based architecture with event-driven communication (event modeling, topic design, schemas, reliability patterns)

• Design and oversee authentication and authorization strategies: OAuth 2.0 / OIDC, SSO integrations, token strategies, and secure API access patterns

• Ensure backend services expose functionality via REST APIs, enabling independent SPA and mobile application development

• Guide teams on deployment and operational readiness for Azure / Kubernetes / OpenShift, including autoscaling, failure handling, and production resilience

• Apply AI-assisted development tools pragmatically (e.g., refactoring support, test scaffolding, documentation), ensuring strict review and compliance with security policies

• Act as a technical mentor and trusted advisor, raising the overall engineering maturity of the teams

What awaits you at Avenga?

Through our values – Better Minds, Bolder Ideas, and Bigger Hearts – we strive to provide you with the tools, autonomy, trust, and assistance you need to excel. You’ll work on high-impact systems, influence strategic technical decisions, and collaborate with strong engineering teams in an environment that values quality, ownership, and continuous improvement.
Enjoy benefits like private health insurance, well-being programs, flexible and hybrid work models, laptops and gear, training opportunities, language classes, social events, and more.

At Avenga, everyone matters. We provide equal opportunities in recruitment, career development, and leadership, regardless of race, ethnicity, gender identity, sexual orientation, disability, age, religion, or any other characteristic. We are committed to fostering a work environment where our diverse community of employees, candidates, and business partners actively shapes our growth. By bringing together people from different backgrounds and experiences, we build a workplace where everyone feels free to be themselves while honoring the boundaries of others.