Senior Software Engineer

Balyasny Asset Management L.P.; Warszawa; On-site; PLN 100,000 - 130,000; Full time

Job summary

Balyasny Asset Management L.P. is seeking a Senior Software Engineer in Warsaw, Poland. This role requires deep expertise in Rust and AI-assisted software development tools. You will build high-performance systems to support global trading across multiple asset classes. The ideal candidate has over 5 years of experience, strong knowledge of distributed systems, and is comfortable working in a collaborative team environment. Join us to tackle challenging projects at scale and help shape machine-assisted development practices.

Qualifications

• 5+ years of experience building and shipping production software in high-performance environments.
• Extensive experience using AI-assisted software development tools.
• Significant production experience with Rust, including async/await and multithreaded programming.

Responsibilities

• Build high-performance, multithreaded Rust systems for trade flow processing.
• Design and operate reliable, observable distributed services.
• Use AI coding tools to enhance development workflow.

Skills

Rust programming

AI-assisted development tools

C#/.NET knowledge

Distributed systems

AWS experience

Strong communication

Tools

Kafka

RabbitMQ

SQS/SNS

Job description

We are looking for a Senior Software Engineer who is both a strong systems engineer and an AI-native builder. You should have exceptional programming fundamentals, deep experience shipping production software, and extensive hands‑on experience using AI coding tools and agents as part of your core development workflow.

This role is focused on building and scaling our trade management platform, with primary development in Rust and selective work in C#/.NET. You will work on a high-throughput event processing platform that handles hundreds of millions of events supporting trade processing across Equities, Macro, Credit, and Commodities. We are looking for someone who can combine first‑principles engineering with modern AI‑assisted development to move faster, solve harder problems, and raise the standard of execution.

What You’ll Do

• Build high-performance, multithreaded Rust systems for large-scale trade flow and event processing.
• Design, ship, and operate distributed services that are reliable, observable, and production-ready.
• Use AI coding tools and agents such as Claude Code, Codex, or similar platforms to accelerate design, implementation, debugging, testing, and refactoring.
• Apply strong engineering judgment to validate AI-generated work and ensure correctness, security, performance, and maintainability.
• Own systems end‑to‑end, from architecture through deployment and production support.
• Improve throughput, latency, memory efficiency, and AWS infrastructure cost at scale.
• Collaborate with engineers across New York, London, Poland, Singapore, and Hong Kong.

What We’re Looking For

• 5+ years of experience building and shipping production software in high-performance or enterprise environments.
• Excellent programming fundamentals, including software design, data structures, algorithms, concurrency, debugging, and testing.
• Extensive experience using AI-assisted software development tools and coding agents to materially improve development velocity and deliver production applications.
• A track record of using AI not just for autocomplete, but as a real engineering accelerator across coding, testing, debugging, refactoring, documentation, and workflow automation.
• Strong judgment on when to trust AI, when to verify deeply, and when to rely on first‑principles reasoning.
• Significant production experience with Rust, including async/await, ownership, memory management, and multithreaded programming.
• Working knowledge of C# and .NET Core.
• Experience building distributed systems using REST, gRPC, microservices, and messaging platforms such as Kafka, RabbitMQ, or SQS/SNS.
• Strong AWS experience, including serverless and performance‑aware system design.
• Strong communication skills and the ability to work effectively in a fast‑moving, collaborative team.

Nice to Have

• Experience building AI-native development workflows or integrating coding agents into team engineering processes.
• Familiarity with Agile, TDD/BDD, and Rust testing frameworks.
• Knowledge of React or Angular.
• Understanding of FIX, MS SQL, financial markets, and post‑trade lifecycle processes.

Why Join Us

• Work on business‑critical systems that support global trading across multiple asset classes.
• Solve hard distributed systems and performance problems at meaningful scale.
• Join a team that believes the best engineers will combine deep technical fundamentals with effective use of AI.
• Help define how AI‑assisted and agent‑based software development is applied in a serious production environment.

Even if your experience doesn’t match every requirement, we’d still love to hear from you—if you’re excited about this role, we encourage you to apply!