Senior Software Engineer – Rust / AI-Native Development

Nigel Frank International; Poland; On-site; PLN 180,000 - 240,000; Full time

Job summary

Nigel Frank International seeks a Senior Software Engineer to help build and scale a high-throughput trade management platform using Rust and C#/.NET Core. You will design and implement high-performance services and work closely with teams to ensure reliability and scalability.

You will apply AI-assisted development tools to accelerate coding, testing and refactoring, while maintaining security and performance across distributed systems.

Qualifications

• 5+ years of commercial software engineering experience.
• Strong knowledge of C# / .NET Core.
• Expertise in Rust and async programming.
• Experience with AI-assisted development tools.
• Experience with distributed systems and cloud (AWS).
• Knowledge of REST, gRPC and messaging.

Responsibilities

• Build high-performance, multithreaded systems in Rust.
• Design and operate scalable distributed services.
• Leverage AI tools to accelerate development and testing.
• Review AI-generated code for security and performance.
• Own systems across architecture to production support.
• Optimize latency, memory usage, and AWS costs.
• Collaborate with international engineering teams.

Skills

Rust

C# / .NET Core

Async programming

Multithreading

AI-assisted development tools

Distributed systems

AWS

Algorithms & data structures

Tools

Kafka

RabbitMQ

SQS/SNS

React/Angular

Claude Code

Codex

Job description

We are looking for a Senior Software Engineer with strong systems engineering fundamentals and hands‑on experience using AI coding tools and agents as part of their everyday development workflow.

You’ll join a team building and scaling a high-throughput trade management platform, primarily using Rust, with some C#/.NET. The platform processes hundreds of millions of events across multiple financial markets, making performance, scalability and reliability central to the role.

What you’ll do:

• Build high-performance, multithreaded systems and event-driven services in Rust.
• Design, develop and operate scalable distributed systems in production.
• Use AI coding tools and agents to accelerate development, testing, debugging, refactoring and automation.
• Review and validate AI-generated code with a strong focus on security, performance, correctness and maintainability.
• Take ownership of systems across the full lifecycle, from architecture and development through to deployment and production support.
• Optimise performance, latency, memory usage and AWS infrastructure costs.
• Work collaboratively with engineering teams across international locations.

What we’re looking for:

• 5+ years’ commercial software engineering experience, ideally in high-performance or enterprise environments.
• Working knowledge of C# / .NET Core.
• Strong programming fundamentals covering software design, algorithms, data structures, concurrency, debugging and testing.
• Significant commercial experience with Rust, including async programming, ownership, memory management and multithreading.
• Proven hands‑on use of AI-assisted development tools / coding agents such as Claude Code, Codex or similar.
• Experience using AI beyond code completion to support implementation, testing, debugging, refactoring and engineering workflows.
• Strong understanding of distributed systems, microservices, REST, gRPC and messaging (e.g. Kafka, RabbitMQ, SQS/SNS).
• Strong AWS experience and an understanding of performance‑aware cloud architecture.
• Experience with AI-native engineering workflows, TDD/BDD, Rust testing frameworks, React/Angular, FIX, MS SQL or financial markets would be advantageous.