Senior C++ Software Engineer, FIX, Client Connectivity

Optiveum

. Define architectural solutions and solve complex technical challenges in a global team .

Posted 11/9/2026full-timeKraków • PolandSenior💰 PLN 120 - PLN 130 per hourWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in C++ programming, particularly in multi-threading and data structures, while delivering high-performance solutions in equity trading systems. Proficient in collaborating with global teams and adopting DevOps practices to enhance client connectivity platforms.

Highest-signal resume keywords

C++ ProgrammingLinux/Unix EnvironmentsEquity Trading SystemsDevOps PracticesFIX Protocol

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

Multi-ThreadingData StructuresSTLSocket ProgrammingAlgorithmsHigh-Performance SystemsTransaction-Oriented SystemsOrder Management SystemsLow-Latency SystemsConfiguration Management

Soft Skills

Excellent English Communication

Industry Keywords

Client ConnectivityComplianceGlobal Investment BankHigh-Availability SystemsBusiness Stakeholders

Tech Stack

Tools & technologies

Distributed SystemsLinuxUnixC++

About the role

Key responsibilities & impact

Define architectural solutions and solve complex technical challenges in a global team
Modernise existing client connectivity platforms, improving scalability, reliability and maintainability
Deliver performance improvements, client-specific functionality and compliance with changing market regulations
Adopt DevOps practices and advance CI/CD
Collaborate with business analysts, developers and business stakeholders across regions
Perform hands-on coding, technical design, configuration management, release execution and post-implementation support
Work on global client connectivity and equity trading systems for a leading global investment bank
Spend approximately 80–90% of working time on development

Requirements

What you’ll need

5–7 years of hands-on C++ experience, including multi-threading, data structures, STL, casting, templates, pointers, socket programming and algorithms
Programming experience in Linux/Unix environments
Development experience in a financial environment involving 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, business and technical
Polish or EU citizenship, or permanent residence/work permit valid for at least 12 months
Accurate CV dates and employer information for background check
Application and CV name must exactly match official ID document
Candidates who participated in a recruitment process for this IT services partner or bank within the last 12 months cannot be considered
Technical tasks are completed live; environment, tools and language/framework versions must be set up and tested beforehand
AI tools, coding assistants and code generators are not allowed during interviews