Senior C++ Software Engineer (FIX, Client Connectivity)

You will work on the bank's global client connectivity and equity trading systems, as part of a multi-year initiative to modernise its connectivity platforms. The role is strongly hands-on: about 80–90% of your time goes to development work.

Key Details:

* Rate: 120–130 PLN/h (B2B), depending on experience

* Work Model: Hybrid, 3 days per week from the client's office (non-negotiable), full-time

* Location: Kraków (candidates must live in or within commuting distance of Kraków)

* Start: December 2026

Responsibilities:

* Work in a global team to define architectural solutions and solve complex technical challenges

* Contribute to the modernisation of existing client connectivity platforms, improving their scalability, reliability and maintainability

* Deliver technical enhancements: performance improvements, client-specific functionality and compliance with changing market regulations

* Help transform the team's delivery ecosystem by adopting DevOps practices and advancing CI/CD

* Collaborate with business analysts, developers and business stakeholders across regions

* Hands-on development: coding, technical design, configuration management, release execution and post-implementation support

Requirements:

* 5–7 years of hands-on C++ experience: multi-threading, data structures, STL, casting, templates, pointers, socket programming and algorithms

* Programming in Linux/Unix environments

* Development experience in a financial environment on order management systems, the FIX protocol and order-state handling (essential)

* Experience building high-performance, high-availability, high-throughput, low-latency, transaction-oriented distributed systems

* Strong knowledge of the equity trading environment, ideally in a multi-regional setting

* Excellent English communication skills (business and technical)

* Polish or EU citizenship, or a permanent residence / work permit valid for at least 12 months

Nice to Have:

* Prior experience working on a client connectivity system

* Java experience: Core Java, Collections and Reflection

* Level 3 (development) support in a pressurised production environment

Recruitment Process:

* Technical tasks are done live: please have your environment, tools and language/framework versions set up and tested beforehand. The use of AI tools, coding assistants or code generators during interviews is not allowed

* The selected candidate will go through a background check, so the dates and employers in your CV must be accurate

* Your name in the application and CV must match your official ID document exactly (Polish citizens: please include all first names)

* Candidates who took part in a recruitment process for this IT services partner or this bank in the last 12 months cannot be considered