Senior Backend Engineer (FIX & Identity)

Location: Banja Luka, Belgrade, Bitola, Kragujevac, Niš, Novi Sad, Ohrid, Skopje, Istanbul, or İzmir; multiple locations across Bosnia and Herzegovina, Serbia, North Macedonia, and Turkey.

Company

hirify.global is an international engineering firm helping businesses operate with AI at the core, with more than 6,000 experts worldwide.

What you will do

• Build backend services for a trading platform where speed and accuracy are critical.
• Connect the platform to banks, brokers, and trading venues through the FIX protocol.
• Implement login and access control across services.
• Design pricing and financial calculations with exact results and controlled rounding.
• Improve system reliability, monitoring, and observability as the platform grows.
• Share expertise with engineers and help establish engineering standards while collaborating with product, frontend, and DevOps colleagues.

Requirements

• 5+ years of experience building backend systems, ideally with C#/.NET; strong Java engineers are welcome with time provided to transition to .NET.
• Hands-on experience with the FIX protocol on electronic trading platforms in fintech or capital markets.
• Experience with login and access control using OAuth2, OpenID Connect, IdentityServer, or similar technologies.
• Experience designing and building APIs used by other teams.
• Solid experience with message-based, event-driven systems.
• Experience with financial calculations such as pricing, where small rounding errors matter.
• Experience with MongoDB or another NoSQL database.
• Some experience with monitoring tools such as Datadog, Sentry, or Elasticsearch.
• Clear communication and effective collaboration with product, frontend, and DevOps colleagues.

Nice to have

• 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.

Culture & Benefits

• Equal-opportunity and respectful working environment.
• Collaboration across international engineering teams and multiple disciplines.
• Work focused on AI-native engineering and real-world impact across industries and markets.

Hiring process

• Submit a CV describing core skills and career interests.
• Complete a talent call, technical interview, and, for some roles, a customer interview before receiving an offer.