Senior Product Engineer - Future of Work

About the role

Mainstream is the leading cloud provider in Southeast Europe and is becoming an AI-native company by redesigning how teams work, collaborate, make decisions and manage their work. It is looking for a Senior Product Engineer in Belgrade: someone who understands how companies operate and turns real business and operational problems into products that make work better. This is not a traditional software engineering role: you will identify problems worth solving, rethink how things could work, shape the product and build the solution, using AI as a tool rather than needing to be an AI expert.

Key responsibilities

• Own products and initiatives end-to-end, from problem discovery and ideation to definition, planning, development, rollout and continuous improvement.
• Work directly with teams across the company to understand their business needs, processes, pain points and opportunities.
• Rethink and redesign how work gets done, turning business and operational problems into products, workflows and automations.
• Shape the product, not just the implementation, and design solutions in areas such as service operations, project and task management, knowledge, performance, reporting, monitoring and business workflows.
• Connect existing tools and systems through APIs, integrations and automation, and take solutions from idea to production while driving adoption.
• Use modern development tools, including AI-assisted coding, and explore how AI and agents can create value.

Required profile

• 5+ years of combined experience across software engineering, product development, operations or related roles.
• Strong understanding of how organizations, business processes and operations work, and a strong product mindset.
• Experience designing or improving workflows, processes or business applications, and working with users and stakeholders.
• Ability to work independently and take ownership from problem discovery to adoption.
• Fluent English and fluent Bulgarian.
• Nice to have: background in B2B SaaS, enterprise software, IT services or managed services, and experience in Product Manager, Product Owner, Operations Manager, Solutions Architect or Implementation Consultant roles.

Required skills

• Hands-on software development skills, able to turn an idea into a working product.
• Experience with APIs, integrations, databases and modern web applications.
• Nice to have: cloud infrastructure, managed services, IT operations, DevOps, monitoring or cybersecurity; enterprise platforms such as ServiceNow, Jira, SAP, Salesforce, Workday, Monday, Asana or Linear; AI agents, workflow automation, RAG, knowledge systems, observability, analytics and reporting, and AI-assisted development.

What we offer

• The chance to help shape Mainstream's journey toward becoming an AI-native company.
• Significant autonomy and the opportunity to own products from problem discovery to real-world use.
• A hands-on, AI-first environment where you learn by building with AI-assisted development, agents and automation.