Senior Fullstack Developer (Backend-Heavy) Trading Software

About the role: Senior Fullstack Developer (Backend-Heavy)

.NET 7+, TypeScript, React | Long-Term Contract | On-site-first later Hybrid

We're looking for a senior fullstack developer, a real programmer with a strong backend focus to join our elite team in Gothenburg. You’ll be part of a tight-knit group where great developers and top traders collaborate to build world-class trading software. This role is perfect for someone who thrives in a complex domain, values precision, and enjoys working with cutting-edge tech.

🌟 What You’ll Be Working On

As a key developer, your responsibilities will span across several high-impact areas:

- Data Visualization: Functionality comes first, not flashy design.

- DSL Development: Help build our proprietary Excel-like scripting language for data analysis.

- Mathematical Modeling: Work on custom financial models – an interest in data science is a big plus.

- Data Processing: Integrate diverse data sources via APIs, SQL Server (Entity Framework Core), scraping, Excel, etc.

- Automation: Opportunities to explore simple AI-driven automations (no AI experience required – great starting point).

- Event Management: Utilize Reactive Extensions and build robust event-driven tools.

👤 About You

- At least 5 years of experience in software development, including large-scale projects with architectural complexity.

- Deep experience with C#/.NET (7+), TypeScript, JavaScript, React, Entity Framework.

- Solid understanding of MS SQL (on AWS).

- Familiarity with Azure DevOps is a plus (basic use).

- You’re obsessed with doing things right, with a laser focus on quality and minimizing risk.

- You’re comfortable discussing money and finance-related topics – no trading experience required, but you should be open to learning.

- Swedish language is a bonus and not a must

- You’re planning to stay in Sweden long-term.

🔧 Tech Stack

Backend: .NET 7+, C#, Entity Framework Core

Frontend: TypeScript, React

Database: MS SQL Server (hosted on AWS)

Tools: Azure DevOps, Reactive Extensions

📍 Working Conditions

Start: Within a few weeks

Duration: At least 6 months, with a strong option to extend to 1 year

Location: On-site in Gothenburg – initial period full-time in office, later hybrid with minimum 3 days/week on-site

Interview: In person only

💬 Why Work With Us?

We’re not just another tech company. We build software used in our own trading operations – a domain we’ve mastered over the past decade. With no bureaucracy and fast iteration cycles, you'll have the freedom to be creative and build meaningful tools that are used daily by our team.

You’ll work directly with the product owner, who is also a programmer, trader, and your future manager.

You’ll get clear requirements and immediate feedback.

You'll be developing tools we rely on – and improving them based on real-world use.

You’ll be surrounded by technically skilled peers who care about quality and innovation.

If you're passionate about software engineering, love working in a high-complexity environment, and want to build something truly impactful – we’d love to meet you.