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

Location: Hybrid in Kraków, Poland; 3 days per week from the client's office are required. Candidates must live in or within commuting distance of Kraków.

Rate: 120–130 PLN/hour on a B2B basis, depending on experience.

Company

hirify.global is a recruitment and consulting company providing project-based and permanent opportunities for clients in Poland and abroad.

What you will do

• Define architectural solutions and solve complex technical challenges in a global team.
• Modernise client connectivity platforms for improved scalability, reliability, and maintainability.
• Deliver performance improvements, client-specific functionality, and updates required by changing market regulations.
• Adopt DevOps practices and advance CI/CD across the delivery ecosystem.
• Collaborate with business analysts, developers, and business stakeholders across regions.
• Perform hands-on coding, technical design, configuration management, release execution, and post-implementation support.

Requirements

• 5–7 years of hands-on C++ experience, including multithreading, data structures, STL, casting, templates, pointers, socket programming, and algorithms.
• Programming experience in Linux/Unix environments.
• Essential: financial-environment development experience with order-management systems, the FIX protocol, and order-state handling.
• 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 for business and technical contexts.
• Polish or EU citizenship, or a permanent residence/work permit valid for at least 12 months.

Nice to have

• Experience with client connectivity systems.
• Java experience, including Core Java, Collections, and Reflection.
• Level 3 development support in a pressurised production environment.

Culture & Benefits

• Full-time hybrid work with a non-negotiable requirement to work 3 days per week from the client's Kraków office.
• B2B cooperation agreement signed directly with hirify.global.
• Hands-on development represents approximately 80–90% of the role.
• Work with a global investment bank on a multi-year connectivity-platform modernisation initiative.

Hiring process

• Complete live technical tasks with the required environment, tools, and language/framework versions prepared and tested; AI tools, coding assistants, and code generators are not permitted during interviews.
• Provide accurate CV dates and employer information for the background check; the application and CV name must match the official ID exactly, with Polish citizens including all first names.
• Candidates who participated in a recruitment process for the partner IT services company or bank within the last 12 months cannot be considered.