Hastee, a Zellis company, is an award-winning fintech start-up providing a market-leading financial well-being solution. Our platform allows workers to get paid flexibly at any time of the month, provides money management and budgeting support, and helps them save sustainably. We deliver this in a B2B2C model, selling our solution to major employers, who in turn offer the Hastee app as a corporate benefit to their staff.
Our revolutionary technology is designed to improve the productivity of the workforce and in turn, their organizations, and we are proud to have an NPS of 76 and 4.8/5 rating in the Apple Store and Google Play. Unsurprisingly, we’ve already won over 300 amazing clients, including McDonald’s, PayPal, and the NHS, and are now on a fantastic growth journey.
Hastee was founded with a socially driven mission and has offices in Barcelona and London. We are backed by some of the leading fintech investors and are playing a crucial role in supporting workers affected by the cost-of-living crisis.
Responsibility:
Architect, develop, and maintain scalable backend services using .NET 8 and C#, with a focus on high availability and performance.
Design and implement domain-driven design (DDD) principles, including aggregates, value objects, and domain events, in complex business processes.
Implement event-driven architectures using patterns such as Outbox with CDC and SAGA for distributed transactions.
Develop and maintain RESTful APIs and microservices, ensuring best practices in API design and security.
Provide technical leadership and mentorship to other developers, supporting their growth and improving overall code quality.
Develop internal tools and libraries to improve development workflows and efficiency.
Ensure best practices in software engineering, including unit testing, integration testing, and performance optimization.
Work in an agile environment, actively participating in code reviews, standups, and retrospectives.
5+ years of experience in backend development using C# and .NET Core/.NET 8.
Strong understanding of microservices architecture and event-driven systems.
Experience with Domain-Driven Design (DDD) and event sourcing.
Deep knowledge of RESTful API design, authentication, and security best practices.
Hands-on experience with asynchronous messaging and event-driven processing.
Strong knowledge of SQL.
Strong communication skills and ability to collaborate in a remote-first environment.
Good in English
Why Join Us:
Flexible work environment (hybrid or fully remote in the Spain).
Opportunity to work with cutting-edge technologies in a fast-growing fintech startup.
Strong engineering culture with a focus on quality, scalability, and innovation.
A supportive, diverse, and dynamic team that values growth and learning.
Work on a product that makes a real social impact on financial well-being.
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What We Do
Hastee is the heart of employee financial health. We nurture employees’ Financial Health by allowing them to take charge of their finances. How we do it: We enable access to a portion of their earned pay, on-demand when they need it. We deliver financial education & management tools, including savings, rewards & cashbacks and budgeting tools to help your people better understand their finances and make decisions that ultimately make their money go further. Our technology is designed to improve productivity of your workforce and in turn, your business. Hastee is unrivalled in the market Did we mention this won’t cost you anything. Hastee is a no-brainer
