# Senior .NET Developer (FIX Protocol) at Avenga

> Open job at Avenga. Workplace: Remote (Poland).

Source: Poland Dev Jobs, https://poland-devjobs.com/jobs/avenga-senior-net-developer-fix-protocol-7457qhl
Posted 6 November 2026. Last checked on the employer's career site: 8 November 2026.

## Facts

- Company: [Avenga](https://poland-devjobs.com/companies/avenga)
- Location: Remote (Poland)
- Workplace: Remote (Poland)
- Employment type: Full-time
- Polish: Not required
- Skills: .NET, C#, Databricks, Elasticsearch, Java, Microservices, MongoDB, RabbitMQ, React, Redis, Redux
- Not mentioned in the job post: salary, visa sponsorship, relocation, where you can apply from

## Job description

_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._

**_At the core of the role_**

We are looking for strong backend engineer with experience in the FinTech domain, working on a microservices and event-driven architecture based on .NET, MongoDB, Redis, RabbitMQ (MassTransit), Pulsar, and Elasticsearch. Experienced in designing scalable distributed systems and collaborating within a 7-person engineering team. Additionally exposed to React development.

**_Core skills you’ll bring_**

- **5+ years of backend development experience**
- Strong **C#/.NET** (Java may be considered)
- Experience building and designing **APIs**
- **Distributed messaging systems** and **event-driven architectures**
- **FIX Protocol** experience in a **capital markets / electronic trading** environment
- Experience with **financial calculations, pricing engines, or quantitative models**
- Hands-on experience with **QuantLib** (or similar quantitative finance libraries)
- **OAuth2, OpenID Connect, IdentityServer** or similar authentication frameworks
- **MongoDB** or other NoSQL databases
- Experience in **capital markets, fintech, trading platforms, fixed income, securities pricing**

**_Nice-to-have_**

- Datadog, Sentry, Elasticsearch
- SignalR / WebSockets
- Pulsar, Databricks, Lakehouse
- React + Redux (nice to have)
- Experience mentoring engineers / technical leadership

**_The impact you'll create_**

• Design and develop high-quality backend services using C#/.NET
• 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 support high-throughput
trading systems.
• Develop and optimize data solutions using NoSQL databases such as MongoDB.
• Design and implement financial calculation engines, pricing models, and quantitative algorithms with a
strong emphasis on accuracy and performance.
• Implement and maintain FIX protocol integrations to support electronic trading workflows.
• Design and enforce identity, authentication, and authorization solutions across backend services.
• Integrate and work with observability platforms such as Datadog or Elasticsearch to support system
monitoring and diagnostics.
• Ensure numerical precision in financial computations, including proper handling of rounding, accruals,
and market conventions.
• Collaborate with product, UI/UX, frontend, and DevOps teams to align on development and deployment
strategy.
• Build reusable, testable backend infrastructure and uphold consistent coding standards across teams.
• Implement telemetry and monitoring best practices using Sentry or equivalent tools.
• Evaluate and adopt new technologies, frameworks, and design patterns to continuously improve
engineering outcomes.
• Mentor engineers on backend development best practices and foster a culture of engineering
excellence.
• Contribute to frontend solutions using React and Redux/Rematch where needed. (nice to have)

_People are at the core of Avenga. We provide equal opportunities regardless of race, ethnicity, gender identity, sexual orientation, disability, age, religion, or any other characteristic. We are committed to a respectful environment where everyone can be themselves, share their ideas, and feel that they belong._

## How to apply

Apply on the job page, https://poland-devjobs.com/jobs/avenga-senior-net-developer-fix-protocol-7457qhl: its Apply button opens the employer's own application page.

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