Quant Engineer (Early Careers)

The team:

The team is responsible for quant applications used for delivery of optimisation services for large financial institutions. We value learning from and supporting each other in order to benefit from our different strengths and experiences. We are strong believers that collaboration is key to innovation and to produce a user experience and a technical solution that we can be proud of.

Responsibilities and impact:

OSTTRA is a FinTech company at the heart of the global financial system, dedicated to building the future of post-trade. We keep our eyes on the horizon, always on the lookout for new possibilities and opportunities while staying with our feet on the ground, making sure we deliver rock solid services that our clients rely on for their daily business and success. Our optimisation services create distinct positive impacts to client portfolio risk profiles and operational costs. When our services execute, global metrics of systemic risks in the financial markets improve significantly.

Long-term value to the client is the most important goal of our team, and your contribution in the form of delivery, improvements and innovations can have a significant impact on the financial system.

We are seeking talented and passionate individuals with a background in applied mathematics, optimisation, linear algebra, or numerical methods, coupled with a strong inclination towards software development. As a Quant Engineer in our optimisation Technology team, you will play a pivotal role in driving positive impacts on client portfolio risk profiles and operational costs through the application of advanced algorithms and optimisation techniques.

Key Responsibilities:

• Collaborate with cross-functional teams to design, develop, and implement optimisation algorithms and solutions tailored to client needs.
• Conduct research and experimentation to enhance existing algorithms and develop innovative approaches to address evolving challenges in post-trade operations
• Analyse and interpret large datasets to identify patterns, trends, and opportunities for optimisation.
• Contribute to the continuous improvement of algorithms through rigorous testing, validation and optimisation methodologies.
• Engage in rapid, iterative development cycles to deliver scalable and reliable solutions that meet client requirements.

What’s in it for you:

As an employer we strongly believe in individual growth and have long experience in guiding early-careers quants on the path to becoming industry experts in our fields. We believe in:

• An innovative culture with strong focus on exploration and research, where failing fast is a virtue which drives technological and product improvements.
• Being engineers and not theorists, finding solutions to real problems, and a focus on innovation and rethinking is the path to continuously improving algorithms.
• Generosity and support, we succeed and fail together, always sharing knowledge and experiences to help our services and each other to grow.
• Individual growth and perspectives spring from continuous exposure to new problems and fields, and from working on important and meaningful problems, with full support from senior team members
• Rapid, iterative and phased delivery, backed by modern software engineering practices such as automated testing and deployment frameworks.

What we’re looking for:

Fundamental requirement:

• Master's degree in a quantitative field such as mathematics, computer science, engineering, or related disciplines
• Proficiency in programming languages such as C++, Python or Java, with a strong foundation in software development principles and practices.
• Solid understanding of mathematical concepts and optimisation techniques, such as Linear Programming, with the ability to apply them in practical problem-solving scenarios.
• Strong analytical and problem-solving skills, coupled with a keen attention to detail and a passion for continuous learning and development.
• Excellent communication and interpersonal skills, with the ability to collaborate effectively within a dynamic and diverse team environment.

At OSTTRA, we believe in fostering a culture of excellence and empowerment, where individuals are empowered to realise their full potential and make a meaningful impact on the financial system. If you are eager to embark on a rewarding journey of innovation and discovery, we invite you to join us in shaping the future of post-trade.

The location: Stockholm, Sweden

Right to work requirements:

This role is limited to persons with right to work in Sweden.

Our Benefits: Global vision, local impact

At OSTTRA, our benefits philosophy offers a market-competitive package that reflects our position as an industry leader. We want to ensure you feel valued, secure, and empowered wherever you are in the world.

Our approach is built on three core pillars:

• Global foundations: We provide a baseline of excellence across all our offices, focusing on comprehensive Health & Wellness, Financial Security, and Work-Life Balance. No matter your location, you are part of a culture that prioritizes your holistic well-being.
• Locally tailored: We benchmark in each market to ensure our packages are genuinely competitive where you live and work.
• Flexibility and growth: We empower you to work in a way that suits your life. This includes a hybrid working model, generous leave policies, and a commitment to your continuous professional development.

The Trust employee ownership plan

Every employee at OSTTRA is an owner, and a member of The Trust, our employee ownership programme. Our distinct culture encourages colleagues to think and act like owners and raise the bar constantly.

This plan reflects our belief that when we work together to build a stronger, more valuable organisation, then all colleagues should benefit from the value we create.

About OSTTRA

We build and operate the infrastructure that the world’s post-trade financial system runs on. Launched in 2021, we have unified more than 20 years of heritage and expertise from four industry leaders into a single, integrated business.

Today,we operate a trusted network that connects thousands of market participants to streamline end-to-end workflows, from trade capture through portfolio optimisation.We translate industry change into workable process, engineering an open, intelligent ecosystem that removes friction and reduces risk for the global markets.

Our distinct ownership culture is underpinned by four behaviours: boldness, curiosity, accountability, and collaboration. In 2025 we were acquired by KKR, one of the world’s most successful private equity firms, and are on a journey of growth and impact.

Joining our team now is a unique opportunity - you will help to shape the next generation of post-trade, transform shared infrastructure into shared benefit, and accelerate your own career. Learn more at www.osttra.com.

Equal opportunity employer statement at OSTTRA:

We are committed to fostering a connected and engaged workplace where all colleagues have access to opportunities based on their skills, experience, and contributions. Our hiring practices emphasise fairness, transparency, and merit, ensuring that we attract and retain the best talent. By valuing different perspectives and promoting a culture of respect and collaboration, we drive and operate the infrastructure that the world’s post-trade financial system runs on.