C++ Software engineer

Selby Jennings; Aarhus; On-site; DKK 750,000 - 1,100,000; Full time

Job summary

Selby Jennings is recruiting a Software Engineer (C++) for an energy trading initiative in Aarhus, Denmark. You will help build the technology stack for power and gas trading and collaborate directly with traders and quants.

Join a greenfield environment with significant ownership, working closely with trading desk teammates to deliver high-performance, scalable systems that influence real trading decisions and commercial outcomes from day one.

Qualifications

• 3+ years of software engineering experience.
• Strong C++ or Rust development skills.
• Excellent understanding of algorithms and backend engineering.
• Strong academic background in Computer Science, Mathematics, Physics, Engineering, or a related quantitative discipline.
• Experience building high-performance, scalable systems; ability to thrive in a fast-paced environment with significant ownership.

Responsibilities

• Build production systems used by traders every day.
• Work on greenfield projects from concept to deployment.
• Contribute directly to trading strategy implementation.
• Solve complex engineering challenges across multiple domains.
• Help shape the growth of a new business from the ground up.
• Mentor and support new engineers as the team expands.

Skills

C++ or Rust

Algorithms & backend

Software engineering

High-performance systems

Ownership in fast-paced env

Education

Bachelor's in CS/Math/Engineering

Job description

Software Engineer (C++) | Energy Trading | Aarhus, Denmark

Imagine joining a startup with the backing, technology, and expertise of one of the most successful quantitative trading firms in the world.

Our client is building a brand-new Energy Trading business in Aarhus, Denmark, Europe's hub for power and gas trading. Combining the agility of a startup with decades of trading expertise, they're assembling a high-calibre engineering team to build the technology that will drive the next generation of energy trading.

This is an opportunity to join at an early stage, influence the direction of the platform, and work on systems that directly impact trading decisions and commercial outcomes from day one.

The Opportunity

As a Software Engineer, you'll help build the entire technology stack that supports power and gas trading, including:

• Trading systems and execution platforms
• Exchange connectivity
• Pricing and analytics infrastructure
• Market data platforms
• Algorithmic trading systems
• Quantitative tooling and trading strategies

What Makes This Different?

Greenfield engineering environment

Direct collaboration with traders and quants

Immediate impact on trading performance

Significant ownership and autonomy

Startup pace with the backing of a globally successful trading firm

Opportunity to shape the technical culture as the team grows

Exposure to one of Europe's most exciting energy trading markets

What We're Looking For

• 3+ years of software engineering experience
• Strong C++ or Rust development skills
• Excellent understanding of algorithms and backend engineering
• Strong academic background in Computer Science, Mathematics, Physics, Engineering, or a related quantitative discipline
• Experience building high-performance, scalable systemsAbility to thrive in a fast-paced environment with significant ownership

Your Impact

• Building production systems used by traders every day
• Working on greenfield projects from concept to deployment
• Contributing directly to trading strategy implementation
• Solving complex engineering challenges across multiple domains
• Helping shape the growth of a new business from the ground up
• Mentoring and supporting new engineers as the team expands

Ideal Backgrounds

We're particularly interested in speaking with engineers from:

• Energy & Commodities Trading
• Quantitative Trading & Market Making
• Electronic Trading
• Low-Latency Systems
• Distributed Systems
• High-Performance Computing
• Financial Technology
• Real-Time Data Platforms