Senior Backend Developer (Platform team)

Smartcat Platform Inc.; London; Remote; GBP 70,000 - 90,000; Full time

Job summary

Smartcat Platform Inc. is seeking a Senior Backend Developer to enhance its API functionality and platform architecture. This role is pivotal in ensuring scalability and performance for the company's evolving product offerings. If you have a strong background in .NET, C#, and are ready to tackle complex challenges in a fast-paced environment, apply to join our innovative and fully remote team.

Benefits

Fully remote team

Innovative approach to a $100B industry

High impact role with significant growth potential

Qualifications

• Experience with writing and maintaining Unit tests and E2E tests.
• Passion for writing clean, maintainable, and testable code.
• Strong problem-solving skills and a growth mindset.

Responsibilities

• Deliver platform API Gateway integration library and documentation updates.
• Enhance and refine the API for performance and usability.
• Propose and drive architectural changes across multiple microservices.

Skills

Problem-solving

Clean code

Maintainable code

Testable code

Microservices

Education

8+ years of proven professional experience as a Software Engineer

3+ years in .NET and C#

Experience in product companies (SaaS)

Upper-intermediate English proficiency

Tools

MongoDB

AWS

ELK

Prometheus

Grafana

Job description

Senior Backend Developer (Platform team)

Europe

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

• Cloud Provider: Amazon AWS
• Monitoring & Logging: ELK (EFK), Prometheus, Grafana

Why joining Smartcat might be your best move so far

• Fully remote team
  We are a global team of 200+ enthusiastic people spread across 30+ countries. We have been fully remote since 2020, with some locations populated with more Smartcaters than others, such as Boston, NYC, SF, the Bay Area, London, and Lisbon.
• Innovating a $100 Billion industry
  Smartcat’s innovative approach towards multilingual content, taps into a $100B industry. Our platform enables enterprise end users to stop using traditional outsourcing methods, and start enjoying an easy-to-use, AI-powered SaaS, that delivers immediate high-quality results, at a fraction of the cost.
• High impact role enabling innovation and inclusion in organizations
  You will enjoy building with us. You will drive changes in how an old-fashioned global language industry operates while improving how hundreds of thousands of people work and millions of people exchange knowledge and ideas worldwide.
• Join the rocketship to scale-up 10x and beyond together
  We are looking for someone to become an integral part of our team and play a crucial role in the most exciting part of our journey: transitioning from a post-Series C startup to a company exceeding $100M in ARR and $1B in valuation. Our journey isn’t for the faint of heart. We are growing at 130% YoY, thanks to our strong product-market fit and high-performing team, and plan to accelerate from here.
• Smartcat Culture : Where Diversity Meets High PerformanceAt Smartcat, we are committed to building a culture that highlights respect and appreciation for each individual's unique background and perspective, while maintaining a strong focus on results and clear, honest and direct communication. We believe in welcoming everyone and fostering an inclusive environment where team members can be their authentic selves at work. Our commitment to diversity and inclusion is steadfast, and we stand firmly against discrimination and harassment.

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