Senior Backend Developer (Platform team)

About Smartcat

Smartcat is building the future of work, where human expertise meets digital teammates to drive 10x to 1000x productivity gains for the world’s leading enterprises.

We’re on the frontier of an entirely new category: Agentic AI. We enable enterprises to build high-performing hybrid workforces made up of both humans and AI agents. These AI agents aren’t generic copilots. They’re fully trained digital teammates that learn from your best people, your content, and your business strategy—ready to get to work from day one.

Our platform combines generative AI, human-in-the-loop workflows, and a living Enterprise Skill Graph that continuously learns and improves. Whether you're launching a product globally, onboarding new hires, translating learning content, or aligning legal teams across regions, Smartcat turns knowledge into action and action into scale.

Over 1,000 companies, including 20% of the Fortune 500, rely on Smartcat to bring their business to the world—instantly, accurately, and in every language. As a Series C company with 130% year-over-year growth, we’re scaling fast and investing in people who want to shape the future of work with us.

Join us in unlocking global potential, one human and agent team at a time.

Why you should join our team

As a Senior Software Engineer on our Product Platform Team (which is focused on our Product’s API Gateway), you will play a pivotal role in rebuilding our product’s core architecture to create a robust, easy-to-use platform. This effort will enable new use cases, drive business opportunities, and ultimately pave the way for external developers to integrate and innovate on our platform. This is an exciting opportunity to be at the forefront of enhancing our platform, and designing & implementing a scalable, high performance Platform layer that powers critical features for our growing client base and new customers’ enablement. We’re looking for someone who is proactive, ready to tackle complex technical challenges, and excited to influence architectural decisions that will shape the entire product’s future.

How you’ll ramp

By Day 30

• Deliver platform API Gateway integration library and documentation updates to teams, assisting with “platformizing” their microservices.
• Gain a deep understanding of the existing codebase and identify areas of improvement to transform our product into a more scalable platform.

By Day 60

• Enhance and refine our API, ensuring it meets the performance and usability needs of both internal and future external developers.
• Collaborate with team members to align on best practices for building a solid, flexible, and maintainable platform.

By Day 90

• Become a self-sufficient contributor who can propose and drive architectural changes across multiple microservices.
• Demonstrate ownership of key platform components, proactively suggesting improvements that will position our product for long-term growth and success.

Overall Outcomes

• As a member of the Platform team, focus on enhancing the platform’s API functionality, stability, and ease of use.
• Assist product teams in modifying (or advising how to do that) their existing microservices to align with platformization efforts.
• Collaborate with the Architecture team to design and implement a more scalable and modern platform architecture.

Requirements

• 8+ years of proven professional experience as a Software Engineer, with at least 3 years in .NET and C#.
• 2+ years of experience in product companies (SaaS).
• Passion and strong skill for writing clean, maintainable, and testable code and well-documented C# code.
• Experience with writing and maintaining Unit tests and E2E tests.
• Advanced experience with MongoDB.
• Upper-intermediate or higher English proficiency (written and spoken).
• Experience with usage of the LLM-based solutions in daily workflow (Cursor, ChatGPT, CoPilot, JetBrains AI Assistant, etc).
• Strong problem-solving skills and a growth mindset.
• Readiness to thrive in a fast-paced startup environment with extreme focus, a strong sense of ownership, and determination.
• Openness to constructive feedback and value the ideas and opinions of others.

Our technologies

• Backend: .NET Core (C#), Python
• Frontend: Vue.js 2/3, Nuxt 3, Typescript
• Databases: MongoDB, PostgreSQL, Elasticsearch
• Messaging Queue: Kafka
• Cloud Provider: Amazon AWS
• Monitoring & Logging: ELK (EFK), Prometheus, Grafana

Why joining Smartcat mi