Software Engineer C /.Net

Software Engineer C /.Net
Porto
Porto, Porto District, Portugal

C# Developer – Electronic Trading Platform (Lisbon or Porto)

Ossia Portugal is expanding its team and we’re looking for a talented C# Developer to contribute to the development of
- performance components for an electronic trading platform. You will join a team working on
- time systems, complex market data flows, and
- edge trading functionalities.

? Your Responsibilities

You will be involved in the full lifecycle of advanced trading components, including:

• Design and development of components for publishing, recording and replaying internal and external market data
• Implementation of simulation engines for the replay tool (what-if scenarios, custom behaviour, etc. )
• Development of external gateways (Horizon, ION…) and connectivity modules
• Contribution to best practices for
  - time and
  - performance application development
• Close collaboration with
  - users (traders, support,
  - office teams) to translate requirements into robust technical solutions
• Support in implementing and optimising trading algorithms

? Your Profile

• Strong analytical mindset and ability to work collaboratively in an agile environment
• Comfortable working with trading teams and business stakeholders
• Excellent technical skills in C#. NET (6+): memory management, multithreading, asynchronous programming
• Good functional understanding of trading systems: order books, automata, quoting, hedging, market microstructure
• Experience building components that handle high-volume event streams (updates, inserts, deletes)
• Knowledge of electronic trading environments is a strong plus

? ? Why Join Ossia Portugal ?

Ossia Portugal is the newly launched Portuguese hub of Ossia Conseil, a French consulting firm specialised in Market Finance and IT. Our mission is to support major international banks established in Lisbon and Porto with
- value technical and functional expertise.

Joining our team means:

✨ Working on high-impact,
- office projects with leading financial institutions

✨ Being part of a rapidly growing team where your voice and expertise matter

✨ Benefiting from the support of a seasoned European firm while enjoying the flexibility and dynamism of a new local structure

✨ Growing your career in a high-tech, international environment

? Contract & Benefits

• Start date: Q1 2026
• Contract: Local
  - time permanent contract
• Hybrid work model: 50% remote with modern offices in Lisbon and Porto
• Meal allowance provided
• Health insurance
• Compensation will be adjusted based on seniority and technical expertise, ranging from 28k for junior profiles to 48k for senior/expert profiles.

If you're passionate about technology,
- time systems and financial markets, we’d love to meet you.