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Avenga

Senior Backend Engineer – FIX, Identity

Avenga

. Build services behind a trading platform where speed and accuracy matter .

Posted 11/5/2026full-timeNorth MacedoniaSeniorWebsite

Core Competencies

Role fit
Core Competencies

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Demonstrates expertise in building backend systems with C#/.NET and strong knowledge of the FIX protocol for electronic trading platforms. Proficient in designing APIs, managing access control, and ensuring system reliability while collaborating effectively with cross-functional teams.

Highest-signal resume keywords
C#/.NET DevelopmentFIX Protocol ExperienceAPI Design and DevelopmentOAuth2 and OpenID ConnectFinancial Calculations Expertise

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills
Backend Systems DevelopmentEvent-Driven SystemsFinancial CalculationsMongoDBQuantLibSignalRWebSocketsMessage-Based SystemsData StreamingAccess Control
Soft Skills
Clear CommunicationCollaboration
Tools & Technologies
DatadogSentryElasticsearchIdentityServerReactRedux
Industry Keywords
FintechCapital MarketsFixed IncomeSecurities Pricing

Tech Stack

Tools & technologies
ElasticSearchJavaMongoDBNoSQLPulsarReactRedux.NET

About the role

Key responsibilities & impact
  • Build services behind a trading platform where speed and accuracy matter
  • Connect the platform to banks, brokers, and venues through FIX
  • Ensure the right people have the right access across services
  • Shape pricing and financial calculations with exact results
  • Help keep the system reliable and easy to monitor as it grows
  • Share experience with other engineers and help establish engineering standards

Requirements

What you’ll need
  • 5+ years building backend systems, ideally in C#/.NET
  • Strong Java engineers are welcome, with time provided to move to .NET
  • Real experience with the FIX protocol on electronic trading platforms in fintech or capital markets
  • Hands-on experience with login and access control using OAuth2, OpenID Connect, IdentityServer, or similar
  • Experience designing and building APIs that other teams rely on
  • Solid experience with message-based, event-driven systems
  • Experience with financial calculations, such as pricing, where small rounding errors matter
  • Comfort with MongoDB or another NoSQL database
  • Some experience with monitoring tools such as Datadog, Sentry, or Elasticsearch
  • Clear communication and ability to work well with product, frontend, and DevOps colleagues
  • Knowledge of fixed income or securities pricing
  • Experience with QuantLib or other quantitative finance libraries
  • Experience with live data streaming using SignalR or WebSockets
  • Exposure to Pulsar, Databricks, or Lakehouse setups
  • Some React and Redux experience for light frontend work

Benefits

Comp & perks
  • Equal opportunities regardless of race, ethnicity, gender identity, sexual orientation, disability, age, religion, or any other characteristic
  • Respectful and inclusive work environment
  • Talent team discussion about goals, experience, culture, and ways of working
  • Opportunity to shape what's next together at Avenga