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Middle Software Development Engineer (C#) - Core Integrations Team at Access Softek. Location Information: Europe. We are looking for a . Middle Back-End C# Developer. to join our . Core Integrations Team. , responsible for integrating our mobile banking platform with major US banking cores such as Keystone, Ultradata, and Symitar. You will contribute to one of the company’s core back-end services used across all products, helping improve the daily experience of millions of users.. In this role, you’ll work on real-world banking integrations,. complex APIs, and high-load services. , collaborate closely with a friendly, distributed team, and solve challenging problems in a fintech environment. You’ll also take part in modernizing a monolithic architecture and preparing it for cloud migration while working in an Agile team with mature processes.. This position is remote, full-time, and requires some periodic overlap with US Pacific daytime hours (5–9 AM PST).. Why work in our team?. Design, implement, test and support backend services and APIs.. Develop new features and enhance existing functionality.. Investigate live client requests.. Refine requirements thoughtfully and proactively reach stakeholder to clarify requirements.. Compose test plan together with the team and thoroughly test your changes.. Write all kinds of automated tests according to the test pyramid principle.. Fix bugs according to agreed time frames.. Develop according to team processes and agreements.. Refactor code communicating with code owners and architects.. Document API and features to enable easy implementation and support.. Provide support during deployment sessions when needed.. Requirements. 2+ years as a back-end C# developer.. Demonstrated ability to write well-designed, clean, reusable, and testable code.. Think systematically, act proactively, take responsibility and achieve success without direct guidance.. 5-9 AM PST mandatory overlap hours with the rest of team members.. Experience writing unit tests (xUnit or other framework).. Intermediate level of English for communications and writing technical documentation.. Experience with Git.. As Plus. Experience integrating with 3rd party APIs.. Experience writing integration, API, performance and load tests.. Experience developing high-load services.. Experience solving tasks in complex domains.. Experience working remotely within a distributed team.. Experience in API mocking using libraries like mountebank.. Knowledge of TCP.. Knowledge or experience using gRPC.. Our Benefits. Remote-friendly role, depending on location eligibility. Flexible working hours. Experienced development teams. Long-term employment. Competitive salary . Paid vacation and days off on national holidays. Paid sick leave and internal medical insurance policy. Mental health coverage. Compensation for training and additional education. Community of practice, regular knowledge sharing among colleagues. Provision of computer equipment if necessary. Internet compensation (50$ per month). And other benefits, described in detail in the Staff Handbook. Access Softek. is a US-based product IT company with over 30 years of experience building digital banking solutions for credit unions across the United States. Today, our software is used by more than . 6 million users. in . 350+ financial institutions. , helping millions of people manage their finances every day.