Senior .NET Developer

Sigma Software; United States; Remote; USD 120,000 - 150,000; Full time

Job summary

Sigma Software seeks a Senior .NET Developer to design, build, and deliver features on the C#, .NET Core, and Angular stack. You will own features end-to-end, deploy to AWS, and monitor production while collaborating with cross-functional teams in an Agile setting.

You will bring 5+ years of software development experience, strong OOP and system design skills, and hands-on .NET (C#) and Angular expertise, with a focus on fintech environments and cloud-native practices.

Qualifications

• 5+ years of software development experience with strong OOP and system design.
• Hands-on with .NET (C#) and Angular.
• Knowledge of testing concepts and practices.
• Cloud-native and DevOps practices (CI/CD, automation, monitoring).
• Experience with relational and NoSQL databases.
• FinTech, payments, banking, or regulated financial environments a plus.
• Upper-Intermediate English or higher.

Responsibilities

• Design, build, and deliver features across C#, .NET Core, and Angular stack.
• Write clean, well-tested code (unit/integration/e2e).
• Own features from requirements to deployment.
• Deploy and monitor services in AWS cloud-native environments.
• Handle production issues and incidents with accountability.
• Collaborate with Product, Design, and Engineering in Agile practices.
• Contribute to continual improvement of systems and processes.

Skills

C#

.NET Core

Angular

OOP

System design

Cloud computing

DevOps (CI/CD)

Testing concepts

English

Tools

Docker

Kubernetes

Datadog

Kafka

RabbitMQ

AWS

Job description

• Design, build, and deliver features and projects across C#, .NET Core, and Angular stack
• Write clean, maintainable, and well-tested code (unit/integration/e2e)
• Take ownership of features from requirements breakdown to deployment
• Deploy and monitor services in AWS cloud-native environments
• Handle production issues and incidents with accountability
• Collaborate with Product, Design, and Engineering teams in Agile practices
• Contribute to continuous improvement of systems and processes
• 5+ years of experience in software development with strong OOP and system design skills
• Solid hands-on experience with .NET (C#) and Angular
• Understanding of software testing concepts and practices
• Expertise in cloud-native and DevOps practices (CI/CD, automation, monitoring)
• Experience with relational and NoSQL databases
• Knowledge of non-functional requirements (performance, security, availability)
• Proven experience in FinTech, payments, banking, or regulated financial environments
• Upper-Intermediate English level or higher

WILL BE A PLUS

• Experience with Docker/Kubernetes
• Familiarity with event-driven architectures (Kafka, RabbitMQ)
• Proficiency with observability tools (Datadog or similar)
• Knowledge of domain-driven design (DDD) and complex domain modeling

PERSONAL PROFILE

• Growth mindset, curiosity, and proactivity
• Strong problem-solving skills balancing complexity and simplicity
• Feedback-oriented, open to giving and receiving constructive input
• Ownership & accountability in delivering commitments
• Team player with strong collaboration skills
• Adaptability to changing priorities
• Excellent communication skills across disciplines

Looking to take your .NET expertise to the next level while working on high-impact FinTech solutions? This role offers the chance to contribute to scalable, cloud-native systems that empower thousands of businesses worldwide.

We’re seeking aSenior .NET Developerto join our team, collaborating with talented engineers, product managers, and designers to deliver innovative financial technology.

At Sigma Software, we work with some of the most forward-thinking companies in the industry. This opportunity will let you grow professionally while making a tangible difference in a fast-paced, regulated environment.

CUSTOMER

Our customer is a leading FinTech company providing embedded financing solutions for platforms and marketplaces. Their mission is to enable businesses to offer flexible credit products to customers, helping SMEs access funding quickly and efficiently.

PROJECT

The project involves enhancing and expanding customer’s embedded finance platform, which integrates directly into partner services to deliver fast, flexible funding to SMEs. You’ll work on a modern tech stack, building features that improve customer and partner experiences while ensuring reliability in production.

Key Technologies

Key Technologies: C#, .NET Core, Angular 18, AWS, CI/CD, Docker/Kubernetes, Kafka/RabbitMQ, Datadog, relational & NoSQL databases