Senior Backend Engineer

Job Description

LXT is an emerging leader in AI training data to power intelligent technology for global organizations. In partnership with an international network of contributors, LXT collects and annotates data across multiple modalities with the speed, scale, and agility required by the enterprise. Our global expertise spans over 145 countries and more than 1,000 language locales. Founded in 2010, LXT is headquartered in Toronto, Canada with a presence in the United States, UK, Egypt, India, Turkey, and Australia. The company serves customers in North America, Europe, Asia Pacific, and the Middle East. 

We’re looking for a Senior Backend Engineer with strong Python expertise to design and operate scalable, production-grade systems. You’ll play a key role in shaping backend architecture, improving system reliability, and building services that handle real-world scale

Responsibilities:

• Design, build, and maintain scalable backend services and APIs in Python (e.g., FastAPI, Django)
• Own features end-to-end: from architecture and implementation to deployment and monitoring
• Evolve system architecture toward high availability, fault tolerance, and scalability
• Design and implement event-driven and messaging-based systems (e.g., queues, pub/sub)
• Collaborate closely with Product and other stakeholders to translate requirements into robust technical solutions
• Maintain and improve existing systems, including refactoring and performance optimization
• Implement security best practices and ensure compliance with common standards (e.g., OWASP)
• Contribute to and enforce engineering standards, code quality, and best practices

Drive adoption of modern development workflows (CI/CD, testing, observability)

Participate actively in Agile processes

Qualifications:

• 4–6+ years of experience in backend or full-stack development
• Strong proficiency in Python for building production-grade applications
• Experience with modern Python frameworks such as FastAPI, Django, or similar
• Solid understanding of distributed systems and backend architecture
• Hands-on experience with relational databases (e.g., PostgreSQL, MySQL) and exposure to NoSQL systems
• Experience designing and operating messaging systems (e.g., Kafka, RabbitMQ, SQS, Pub/Sub)
• Experience with cloud platforms (AWS, GCP, or Azure), ideally in production
• Experience with Docker and Kubernetes in production environments
• Familiarity with CI/CD pipelines and automated testing
• Strong understanding of performance optimization, scalability, and system reliability
• Experience with Git-based workflows in collaborative environments

Ability to work independently and take ownership of complex systems

Strong communication skills in English

Nice to have:

• Experience with Ruby on Rails or hybrid Python/Rails environments
• Experience with observability tools (logging, tracing, metrics)
• Knowledge of ML/AI workflows or data pipelines
• Experience working in high-scale or data-intensive environments
  

Additional information:

LXT is an equal opportunity employer and ensures that no applicant is subject to less favorable treatment on the grounds of gender, gender identity, marital status, race, color, nationality, ethnicity, age, sexual orientation, socio-economic, responsibilities for dependents, or physical or mental disability. Any hiring decision is made on the basis of skills, qualifications, and experiences.

We measure our success as a business, not only by delivering great products and services and continually increasing our assets under administration and market share but also by how we positively impact people, society, and the planet.