Senior C++ Software Engineer

JR United Kingdom; London; On-site; GBP 70,000 - 90,000; Full time

Job summary

Join a leading financial technology firm as a Senior C++ Software Engineer, where you'll develop cutting-edge serverless database technology. Work in a dynamic, startup-like environment, optimizing performance-critical areas and collaborating directly with experts. This role offers a unique opportunity to influence product development and contribute to open-source projects.

Qualifications

• 5 to 7+ years of professional experience in C++ development.
• Strong expertise in modern C++20 and performance optimization techniques.

Responsibilities

• Develop and optimize high-performance C++20 code for a serverless database.
• Collaborate with a small team, writing own requirements without product managers.
• Integrate Python wrappers to support research tools.

Skills

C++

Performance Optimization

Multi-threading

Parallel Processing

Network Utilization

Python

Job description

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Exciting Role in Cutting-Edge Financial Data Technology

Innovating High-Performance Data Storage in Finance

I’m working with a client who has developed a state-of-the-art serverless database technology that serves as the foundation for their data infrastructure within the financial sector. This technology, initially built for internal use, has since been open-sourced and is recognized for its ability to deliver extremely fast data retrieval and seamless integration with quantitative research workflows.

The team operates like a startup embedded within a larger financial organization, emphasizing innovation, ownership, and agility. This is a unique environment where a small, expert engineering team drives the development of a critical technology that supports complex data workflows at scale.

What You’ll Do and Gain

As a Senior C++ Software Engineer, you will:

• Develop and optimize high-performance C++20 code that powers a serverless database running entirely on users’ machines, primarily utilizing AWS S3 storage, with support for Google Cloud and on-premise solutions.
• Focus on performance-critical areas such as algorithm efficiency, multi-threading, parallel processing, and network utilization.
• Collaborate closely with a small, agile team where engineers write their own requirements and there are no product managers, giving you direct influence over the product.
• Contribute to an open-source project with rigorous coding standards, enhancing your professional profile and technical skills.
• Integrate Python wrappers to support Python-based research tools, working alongside quantitative developers to streamline data workflows.

This role offers the chance to work in a dynamic, start-up like environment backed by a stable organization, where your work has a direct impact on the technology’s evolution and adoption.

Who They’re Looking For

The ideal candidate will have:

• 5 to 7+ years of professional experience primarily in C++ development, with strong expertise in modern C++20.
• Deep knowledge of performance optimization techniques, multi-threading, parallel processing, and efficient network utilization.
• Familiarity with Python and scientific libraries such as NumPy and Pandas (expertise not mandatory).
• Experience or strong interest in high-performance and big data systems, including data lakes or serverless architectures.
• A passion for writing clean, efficient, maintainable code and thriving in a fast-paced, ownership-driven environment.
• Bonus points for experience in financial markets or open-source contributions, though these are not required as the team supports learning and growth.

If you’re excited by the challenge of building next-generation data technology that powers critical financial workflows, this is a fantastic opportunity to join a talented, high-impact team.

• Apply now to be part of a project that is redefining data storage and accessibility in finance.
• Take the next step in your career by joining a passionate team where your expertise will shape the future of high-performance data technology.