Senior Software Engineer
Fastmarkets · Sofia, Sofia City Province, Bulgaria · Hybrid
Posted Aug 17, 2026
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The Role
This is a great opportunity to join the Fastmarkets Software Engineering Team to help continue grow our technology working alongside highly skilled colleagues enabling us to accelerate our product delivery and scale our business. This team develop, enhance and support our flagship digital platform, serving global customers with critical price data, news and analytics in the commodities markets we serve. We make this data and intelligence easily accessible through multiple channels including web, desktop, API, Excel and mobile applications, enabling customers to integrate our digital offering into their business workflows.
The Senior Software Engineer (Core) is a full-time position working within an Agile team reporting to the Engineering Manager. In this technical role, the Engineer will be working as part of a global team of Software Engineers, Business Analysts and Product Managers to successfully develop and deliver new features. This includes contributing to major projects that make a difference to Fastmarkets customers both in our existing markets such as metals, forest products and agricultural commodity sectors.
Working closely alongside the Digital Product team, the Engineer will be principally working within the Core squad - the team responsible for the foundational platform services that underpin the entire Fastmarkets digital product. This includes authentication and authorisation, user and permissions management, the Admin UI, and customer-facing delivery channels such as the Fastmarkets Dashboard, Excel Add-in and newsletter/email alert services. There will also be opportunities to develop a wider knowledge across all dimensions of the Fastmarkets platform, enabling them to be equipped with both business and technical expertise to tackle Fastmarkets' most exciting business challenges.
Our technical stack is .NET and Angular, our cloud infrastructure is Azure and we seek to use the latest and greatest relevant technologies in our work.
 
Principal Accountabilities
Implementation of technical solutions for new features and product enhancements, primarily within the Core platform area - spanning authentication, authorisation, user entitlements, Admin UI and customer-facing delivery services.
Adherence to sound software engineering design principles - design patterns, SOLID code, and similar practices;
Ensuring solutions are developed to be scalable, flexible, resilient and secure, with particular sensitivity to the security requirements of authentication and permissions systems;
Contributing to the ongoing development and maintenance of the OAuth 2.0 / OpenID Connect authentication platform (Duende IdentityServer) and the user product access (UPA) entitlements framework;
Collaborating on the Admin UI to support internal operations teams managing users, roles, service clients and reference data;
Use of AI-assisted development tools as part of the standard workflow to accelerate implementation and testing,…