Fintech .NET Engineer: Build Scalable High-Load Systems

JustMarkets; United States; Remote; USD 120,000 - 180,000; Full time

Benefits offered by this job

Sick leave 10 days

Vacation 20 days

Public holidays in Ukraine

Medical insurance

Education allowance

Sports budget

Wellness budget

Job summary

JustMarkets is seeking a seasoned .NET Engineer to design and scale fintech software for high-traffic systems. You will work with a strong team focusing on research, data-driven decisions, and continuous improvement to deliver reliable services in a fast-paced fintech environment.

The role requires deep expertise in C#, .NET, distributed architectures, and modern cloud/container tech (Docker, Kubernetes, AWS).

Qualifications

• 5+ years of professional experience with C# and modern .NET.
• Solid understanding of OOP, design patterns, data structures and algorithms, and software architecture.
• Hands-on experience with multithreading and asynchronous programming.
• Strong hands-on experience building and operating production systems, preferably high-load and highly available.
• Practical experience with distributed systems, event-driven architectures, and real-time/low-latency data processing, using tools such as RabbitMQ and Kafka.
• Strong understanding of scalability, reliability, and performance optimization — including autoscaling, performance tuning, and identifying/resolving system bottlenecks.
• Strong experience with relational (preferably PostgreSQL) and NoSQL databases.
• Experience designing and implementing APIs using REST, GraphQL, or gRPC.
• Hands-on experience with Entity Framework.
• Hands-on experience with Docker and solid understanding of Kubernetes concepts.
• Experience writing unit and integration tests, familiarity with TDD practices.
• Experience with continuous integration and delivery tools (GitLab and ArgoCD).
• Comfortable working in a fast-paced Agile environment.
• Understanding of modern AI capabilities and limitations, with hands-on experience using AI-powered coding assistants or agents.
• Solution-oriented mindset, strong communication skills, and attention to detail.
• English proficiency at B1 level or higher for technical discussions and documentation.

Responsibilities

• Design, develop and maintain scalable solutions for high-traffic systems using C# and modern .NET
• Analyze business and technical requirements and translate them into scalable, maintainable software architectures
• Collaborate with engineers and cross-functional stakeholders to design and deliver high-value features
• Write clean, maintainable, testable, and well-documented code, supported by unit, integration and load tests
• Identify and assess technical debt and reliability risks, collaborate with engineering and product leadership to prioritize them based on business impact
• Investigate production issues and improve system observability through effective use of logs, metrics, traces and business data
• Research and introduce new technologies, tools and engineering practices that can improve product quality and development efficiency
• Challenge existing approaches and actively contribute to the continuous improvement of the team, processes and product

Skills

C#

.NET

OOP

Design patterns

Algorithms

Multithreading

Asynchronous programming

Distributed systems

Event-driven architectures

REST

GraphQL

gRPC

Entity Framework

Docker

Kubernetes

PostgreSQL

Redis

ClickHouse

RabbitMQ

Kafka

CI/CD

GitLab

ArgoCD

Tools

PostgreSQL

Redis

ClickHouse

REST APIs

GraphQL APIs

Docker

Kubernetes

AWS

RabbitMQ

Kafka

GitLab

ArgoCD

Job description

JustMarkets is seeking a seasoned .NET Engineer to design and scale fintech software for high-traffic systems. You will work with a strong team focusing on research, data-driven decisions, and continuous improvement to deliver reliable services in a fast-paced fintech environment.

The role requires deep expertise in C#, .NET, distributed architectures, and modern cloud/container tech (Docker, Kubernetes, AWS).