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Senior C++ Developer

Back to job offers
  • Remote or Hybrid at Cracow Poland
  • International environment, Very good English, French is a plus
  • Banking
  • min. 7 years of experience
  • 5000€ to 7000€ per month in B2B / 3700€ to 5700€ per month with contract

Location: Remote or Hybrid at Cracow | Poland-based candidates

We are hiring on behalf of our client, a leading global financial institution that serves millions of customers across personal banking, capital markets, and wealth management. You’ll join a long-term initiative within their capital markets division, supporting systems used by analysts and economists for risk assessment and financial simulations.

You’ll work on a core internal platform designed for financial risk calculations. The system is used daily by internal teams and consists of three major components:

  • A Microsoft Excel front end with custom-built functions and menus
  • A business logic layer built in C++ and Python
  • A large-scale computing grid (50,000+ nodes) operating across internal infrastructure and cloud environments (AWS & Azure)
  • Your role will involve developing new features, resolving bugs, and modernizing parts of the system for better performance and scalability.


Key Responsibilities

  • Design, develop, and maintain C++ code
  • Troubleshoot and fix production issues
  • Collaborate with analysts, developers, and technical leads to implement new features
  • Contribute to the modernization and optimization of existing systems

Requirements

  • 7+ years of experience in software development, with strong expertise in C++
  • Experience with complex financial or trading systems
  • Familiarity with institutional equity or derivatives platforms (experience with Fusion Sophis is a plus)
  • C1 level of English, both written and spoken
  • Strong problem-solving and analytical skills
  • Ability to understand quantitative and financial concepts
  • Experience using version control tools (preferably Git)
  • Educational background in software engineering, computer science, mathematics, or a related field

Nice to Have

  • FinTech or banking sector experience
  • Proficiency in Python
  • Familiarity with RESTful APIs and the Flask framework
  • Experience with containerization technologies such as Docker and Kubernetes

Salary:

  • Professional equipment to work
  • Flexible working hours
  • Remote work possibility
  • Interesting, challenging and exciting work with international teams
  • English lessons with native speaker
  • Training Budget
  • Multisport card


Food:

Lunches from Kraków’s restaurants that are delivered both to the office and homes( or a refund of the budget allocated for it)
Kitchen full of food, drinks, fruit, and snacks

Health

Private medical insurance
Air-conditioning

Well-being:

  • No dress code
  • The chillout area includes comfortable bean bags, therapy balls, PlayStation 4 or Nintendo Switch + games stretching area and pull-up bar
  • Team events
  • Shower


Additional:

Indoor parking place for bicycles

Contact us
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Julien Revillot

Associate Partner

For more than ten years, I’ve been driven by one idea — the future of Space and Defense depends on the people behind it. My career began in technical recruitment, where I had the privilege to hire engineers designing cutting-edge systems for aerospace and advanced manufacturing.

Co-founding Demexios was a natural next step: a way to transform my industry knowledge and relationships into a dedicated structure that helps clients recruit faster, smarter, and with strategic alignment.
Over time, I built long-term partnerships with companies leading technological sovereignty — from NewSpace startups developing electric propulsion to defense integrators modernizing tactical and surveillance systems. These collaborations allowed me to form a powerful network of decision-makers, project leaders, and experts who now trust Demexios to deliver when precision truly matters.
Today, my role is not just to connect candidates and companies — it’s to ensure that every hire strengthens our clients projects.

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Matthieu Konarzewski

Associate Partner

I’ve built my career in sales and recruitment across several industries space, tech, healthcare, and defense. I’ve always been drawn to innovation and the talented people who turn ideas into reality. Over the years, I’ve learned how much a motivated and skilled team can define a company’s success and how the right people will shape the future of the New Space and defense industries.

My international background has allowed me to work with both startups and global organizations, helping them identify individuals who truly fit their culture and business goals. This combination of experience in technology and talent acquisition naturally led to the creation of Demexios.

At Demexios, our mission is simple: to connect experts with the companies that need their skills particularly in the defense and space sectors. I firmly believe that no ambitious project can succeed without a skilled and cohesive team driving it forward.

My commitment is to be a trusted partner for our clients, supporting them step by step in building strong, high-performing teams that deliver tangible results whether their ambitions lie on Earth or beyond.