Senior .Net Developer

Earnly; Remote; GBP 45,000 - 65,000; Full time

Job summary

A dynamic FinTech startup is seeking a talented .NET Developer to build the core infrastructure for their financial management platform. You'll design and develop secure APIs and data processing pipelines. The ideal candidate has over 5 years of backend development experience, proficiency in .NET technologies, and familiarity with MongoDB and SQL Server. We offer a flexible remote working environment and opportunities for equity as part of our commitment to employee growth and contribution to the company's success.

Benefits

Equity within the business

Remote & flexible working environment

Training and development budget

Qualifications

• 5+ years’ experience in backend development, ideally in a startup or SaaS environment.
• Proficient in .Net, Core 8, Razor Pages, and Bootstrap 5 for UI.
• Strong understanding of API design, versioning, and security (OAuth, JWT, API tokens).

Responsibilities

• Build and maintain robust RESTful APIs for mobile and web clients.
• Design and manage databases built in MongoDB and SQL Server.
• Optimize backend performance and ensure application scalability.

Skills

.NET

Backend Development

API Design

MongoDB

SQL Server

Docker

Azure

Agile Methodologies

Tools

Docker

Azure

Git

Job description

About Us

Earnly is a FinTech startup on a mission to simplify financial management and empower individuals and businesses with real-time clarity on their money. We’re developing a new platform that makes financial insights accessible, transparent, and stress-free. As an early member of our team, you’ll have the opportunity to directly shape the product, culture, and future of the company.

About You

You thrive in dynamic environments where no two days are the same, motivated by big goals and the satisfaction of building something meaningful from the ground up. Startups bring tight deadlines, shifting priorities, and lean resources, but you embrace the challenge, staying focused under pressure, taking ownership, adapting quickly, and pitching in wherever needed.

The Role

We’re looking for a talented .net developer with proven commercial experience to help us build the core infrastructure that shall power our entire platform. You’ll be responsible for designing, developing, and maintaining secure, scalable APIs, data processing pipelines, and backend integrations with third‑party services like Stripe, PayPal, and Open Banking providers.

Key Responsibilities:

• Build and maintain robust RESTful APIs for mobile and web clients.
• Design and manage databases built in MongoDB and SQL Server to store, query, and aggregate user financial data.
• Develop data ingestion pipelines to process real‑time and batch data from external services.
• Optimize backend performance and ensure application scalability and resilience.
• Build authentication and authorization flows, following best practices for fintech‑grade security.
• Write unit and integration tests, participate in code reviews, and contribute to continuous improvement.
• Collaborate closely with frontend/mobile engineers, product managers, and founders in agile development cycles.
• Contribute to infrastructure decisions (e.g. Docker, container orchestration, cloud services).

Skills & Experience You’ll Need

• 5+ years’ experience in backend development (ideally in a startup or SaaS environment).
• Proficient in .Net, Core 8, Razor Pages and Bootstrap 5 for UI.
• Experience with databases such as MongoDB and SQL Server, including schema design, indexing, and performance tuning.
• Familiarity with cloud platforms like Azure (we use Azure).
• Experience with containerization tools (Docker, Docker Compose) and deployment pipelines.
• Strong understanding of API design, versioning, and security (OAuth, JWT, API tokens).
• Comfortable working with Git, agile methodologies, and CI/CD practices.
• A good understanding of data protection, GDPR, and fintech security requirements.

Nice to Have

• Exposure to event‑driven architecture or message queues (e.g. Kafka).
• Experience integrating payment platforms like Stripe, PayPal, Plaid, True Layer or Open Banking.
• Exposure to Azure App Services.
• Knowledge of financial systems, accounting, or tax workflows.

What We Offer

• Equity within the business (granted after demonstrating ability and commitment)
• Remote & flexible working environment
• Training and development budget to support your growth
• The chance to join a FinTech startup at an early stage, where your input truly shapes the product and business

Requirements

• UK-based (remote OK), right to work in the UK.

How to Apply

If you are excited by the opportunity to own growth at an early‑stage FinTech and are motivated by equity and long‑term value creation, we would like to hear from you.