Senior.NET Engineer

About the Position

Senior.NET Engineer

Avenga is an international engineering firm helping businesses operate with AI at the core. With 6,000+ experts worldwide, we combine engineering expertise with AI-native thinking to turn ambitious ideas into real-world impact across industries, technologies, and markets.

You will join a FinTech project focused on financial services, built around a modern, distributed architecture. The platform uses an event-sourcing and microservice-oriented approach, supporting scalable and reliable processing of financial data and business events.

Responsibilities

• Design and develop high-quality services using C#/.NET or Java
• Build and maintain ASP.NET service-side applications with a focus on scalability and long-term reliability
• Work with distributed messaging frameworks and event-driven architectures to power high-throughput systems
• Design, implement, and operate event streaming and event sourcing solutions using Pulsar or Kafka, including topic design, consumer group management, and replay strategies
• Develop and optimize data solutions using NoSQL databases such as MongoDB
• Integrate observability platforms such as Datadog or Elasticsearch to support system monitoring and diagnostics
• Implement telemetry and monitoring best practices using Sentry or equivalent tools
• Collaborate effectively across teams to deliver features and align on technical direction
• Build reusable, testable infrastructure and uphold consistent coding standards across teams
• Foster a culture of engineering excellence and continuous improvement across the team
• Leverage AI-assisted development tools such as GitHub Copilot and Claude to improve productivity and code quality

Requirements

• 10+ years of software development experience with a strong emphasis on systems engineering
• Strong proficiency in C#/.NET (Java acceptable)
• Proven experience designing and building APIs
• Solid background in distributed messaging systems and event-driven architectures
• Hands-on experience with Pulsar or Kafka, including event streaming and event sourcing patterns at scale
• Experience implementing financial calculations, pricing engines, or quantitative models
• Experience with NoSQL databases such as MongoDB
• Familiarity with telemetry and observability tools such as Sentry, Datadog, or Elasticsearch
• Experience building and scaling component libraries or design systems
• Experience with AI-assisted development tools such as GitHub Copilot, Claude, or similar
• Strong communication skills and a proven track record of cross-functional collaboration

Nice to Have

• Familiarity with fixed income or securities pricing concepts
• Familiarity with Databricks or Lakehouse architectures
• Hands-on experience with SignalR or WebSocket-based systems

We Offer

• Equal opportunities regardless of race, ethnicity, gender identity, sexual orientation, disability, age, religion, or any other characteristic
• A respectful environment where everyone can be themselves, share their ideas, and feel that they belong

About the Company

Avenga is committed to providing a supportive and inclusive workplace where all employees can thrive. We believe in fostering a culture of continuous improvement and engineering excellence.

Locations

• Ruse, Bulgaria
• Sofia, Bulgaria

Application Process

1. Send your CV: Tell us about your core skills and what you're looking for next.
2. Talent Call: Meet our Talent team to talk about your goals and experience while exploring our culture and the way we work.
3. Technical Interview: We'll explore your experience, strengths, and approach to work to see what we can build together.
4. Customer Interview: For some roles, you'll meet our customers to understand the outcomes your expertise can help create.
5. Welcome to Avenga: An offer is just the beginning. We welcome you to put your expertise into action and shape what's next together.