Senior Software Developer (Java) - LLMs (all genders)

Hi there! Thanks for stopping by 👋

Are you actively looking for a new opportunity? Or just checking the market? Well… you might just be in the right place!

We’re forming a new squad at Lightspeed focused on building AI-powered tools and capabilities. This includes working with LLMs, agent frameworks, and other emerging AI technologies to build internal tools, extend our product suite with new AI features, and help other teams across the company adopt AI effectively.

You’ll be part of a highly collaborative and innovative team of developers, product managers, and designers. Your role will involve backend engineering—especially in our Spring Boot Java ecosystem—while also exploring and applying modern AI techniques to solve real problems.

This is a hands-on engineering role where you’ll work closely with other teams, help build production-ready systems, and grow your knowledge of LLMs on the job. Prior experience with LLMs, agent frameworks, or AI APIs is a plus, but not required.

What you’ll be responsible for

• Building and maintaining backend services and APIs in a Spring Boot Java environment
• Designing and implementing AI-powered tools and product features
• Collaborating with other teams to help them integrate LLMs and AI patterns
• Exploring and applying LLM capabilities such as summarization, classification, RAG, and prompt pipelines
• Writing clean, maintainable, and well-tested backend code
• Ensuring reliability, performance, and scalability of the systems you build
• Staying up to date with developments in the AI space and sharing insights with your team

Who you are

You’re excited about building practical, AI-enabled systems that make work easier and products better. You enjoy solving hard problems with clean code and clear thinking. You’re curious about AI and open to learning new patterns, frameworks, and tools.

You bring deep backend experience, work well in teams, and care about building things that are actually useful.

Requirements

• At least 5 years of experience in backend development
• Strong Java and Spring Boot experience in production environments
• Solid understanding of REST APIs, databases (SQL/NoSQL), and system architecture
• Familiarity with Docker, CI/CD pipelines, and Kubernetes
• Strong communication and collaboration skills
• Comfortable writing well-structured, maintainable code
• Interest in AI technologies and willingness to grow in this space

What will increase your chances

• Experience with one additional backend language (especially Python)
• Exposure to LLM APIs (e.g. OpenAI, Claude), prompt engineering, or agent frameworks
• Knowledge of vector search, semantic retrieval, or document indexing
• Experience building internal tools or customer-facing AI features
• Familiarity with observability tools and performance monitoring
• Understanding of security, access controls, and API standards

What’s in it for you

• Lots of autonomy, flexible work culture with the option of working remotely or from one of our beautiful offices
• Genuine career growth opportunities within a company that's continuously expanding
• Make a meaningful impact by helping teams and customers work more effectively with AI
• Be part of a team large enough for growth yet agile enough for real impact
• Work on high-traffic products with a global user base
• Opportunity to work alongside other highly skilled engineers, learn and expand your skill set, forge wonderful relationships and make your mark within the diverse and inclusive Lightspeed culture, a true Canadian tech success story

… and enjoy a range of benefits that’ll keep you happy and healthy:

• Lightspeed share scheme (we are all owners).
• Flexible working policy.
• Mental health online platform and counseling & coaching services.
• Health and wellness benefits.
• LinkedIn Learning license (learning is always ongoing).
• Volunteer day to be able to give back to society!