Software Developer (6-month contract)

About Halcyon Labs Halcyon Labs builds smart, modern commerce solutions that help enterprise brands move faster and stay ahead. By bringing together AI, data, and composable systems, we create experiences designed for collaboration between people and intelligent agents— helping our clients work more efficiently, adapt quickly, and gain a long-term competitive edge. With more composable launches than any firm in the Americas and deep expertise across commerce architecture, we partner with leading technology providers to deliver scalable solutions that evolve with our clients and accelerate time to value. We blend systems thinking, data-driven design, and intelligent delivery, embedding AI and agents into our own teams to move faster, reduce friction, and co-create with greater precision. The result: adaptive, cross-channel experiences that keep our clients ahead of what’s next. About the Opportunity Are you excited by solving meaningful technical problems and contributing to digital experiences used by thousands of people every day? As a Software Developer at Halcyon Labs , you will work closely with senior developers, designers, and product managers to help build modern commerce and composable commerce solutions for enterprise clients. This role is ideal for a solid full-stack JavaScript developer who is eager to grow, ready to contribute quickly, and excited to deepen their expertise in modern frameworks, composable architecture, and AI-accelerated development. You will help build high-quality features, participate in code reviews, collaborate within Agile teams, and learn from experienced technologists across Halcyon Labs . If you are someone who is already experimenting with AI in your workflow and wants to do more of that in a team that takes it seriously, this is the right environment. Responsibilities Collaborate with senior developers to design and implement features across front-end and back-end systems Work with designers and product managers to estimate and plan work within an Agile framework Communicate progress, risks, and technical decisions clearly with teammates and, alongside senior team members, with clients Write clean, maintainable, well-structured code following industry best practices Participate in peer code reviews to help maintain high-quality, scalable codebases Use AI-powered developer tools — including Claude Code, GitHub Copilot, Cursor, and others — actively and thoughtfully as part of your daily workflow Apply sound judgment in deciding when and how AI-assisted tools help and when they do not Explore opportunities to incorporate AI and automation into workflows such as test generation, documentation, and debugging Create and maintain documentation that supports shared understanding across the team Skills and Qualifications 3 to 5 years of industry experience as a full-stack JavaScript developer Solid proficiency in modern web technologies: HTML, CSS, JavaScript, React.js, Next.js, Node.js, TypeScript, GraphQL, and data fetching and state tools like React Query Understanding of responsive design and cross-platform considerations Strong communication skills and the ability to collaborate effectively across functions and time zones Actively uses AI-assisted tools for coding, debugging, documentation, and exploration — and has genuine opinions about where they help and where they do not Curiosity, a continuous learning mindset, and comfort experimenting with new technologies Professional English proficiency required — written and verbal, for team collaboration and client-adjacent communication Experience with eCommerce, headless commerce, or composable platforms is an asset but not required Experience in a consulting, agency, or client-facing services environment is an asset but not required Is the Role a Fit for You? You’ll thrive as an Intermediate Developer at Halcyon Labs if: You enjoy building high-quality software and seeing your work come to life. You’re eager to deepen your expertise and learn from senior engineers. You’re collaborative, curious, and energized by problem-solving. You’re excited to use AI-powered tools to boost your workflow, not replace your judgment. You like finding ways to automate repetitive tasks and improve processes. You value team success and shared ownership over individual heroics. Benefits and Perks Flexible schedule of full-time hours with a remote-first setup—focus on results, not where you work. Ongoing opportunities for professional development, including certifications, conferences, and in-house mentorship. Benefits required by Mexican law, in full compliance with local regulations Benefits above the law to support your well-being and quality of life Compensation and Hiring Transparency Expected Compensation (Mexico): Compensation will be offered in MXN, aligned with local market benchmarks and the employment model. Final compensation will consider experience, skills, location, internal equity, and business needs. Use of AI in Hiring: To keep the process efficient and focused