Full Stack Developer

Perseus Group; Ciudad de México; On-site; MXN 900,000 - 1,500,000; Full time

Job summary

Jonas Software is seeking a mid-senior platform engineer to lead a migration from legacy stacks to modern architectures. You will drive AI-powered feature integration, collaborate with leadership on priorities, and set coding standards for a lean engineering team.

You will own external API integrat ions, maintain uptime during migrations, and shape the technical roadmap across hospitality, healthcare, and other verticals. Excellent ownership and communication are required.

Qualifications

• Experience replatforming legacy systems to modern architectures.
• Regular use of AI coding tools in day-to-day development.
• Design and implement RESTful APIs and relational database schemas.
• Proficient with Git, CI/CD pipelines and cloud environments (AWS or Azure).

Responsibilities

• Lead the design and implementation of the new platform architecture from legacy systems to modern stacks.
• Build and integrate AI-powered features into the core product.
• Collaborate directly with leadership on architecture decisions, technical priorities, and product roadmap.
• Set code standards, review practices, and engineering culture on a small team.
• Own integrations with external APIs and third-party systems.
• Maintain business continuity during migration phases with minimal downtime.

Skills

Full-stack development

Backend (Node.js/Python)

Frontend (React/Vue)

Legacy migration

AI tooling

REST API design

SQL

Git & CI/CD

Cloud (AWS/Azure)

Tools

Datadog

Sentry

LLM APIs

OpenAI

Anthropic

Copilot

Cursor

AI agents

Job description

Responsibilities

• Lead the design and implementation of the new platform architecture - from legacy systems to modern stacks
• Build and integrate AI-powered features into the core product
• Collaborate directly with leadership on architecture decisions, technical priorities, and product roadmap
• Set code standards, review practices, and engineering culture on a small team
• Own integrations with external APIs and third‑party systems
• Maintain business continuity during migration phases - zero downtime wherever possible

Must-Haves

• Full‑stack proficiency: strong backend (Node.js, Python, or equivalent) AND frontend (React or Vue) - required
• Demonstrable experience replatforming or migrating legacy systems to modern architectures
• AI‑first workflow: regular use of AI coding tools (Copilot, Cursor, Claude, etc.) in day‑to‑day development
• REST API design, relational database design, and SQL
• Git, CI/CD pipelines, and cloud environments (AWS or Azure)
• Ability to operate with genuine ownership in a lean, low‑process team

Nice to Have

• Experience with the hospitality industry or B2B SaaS products
• Microservices or event‑driven architecture experience
• Familiarity with observability tooling: Datadog, Sentry, or equivalent
• Hands‑on experience with LLM APIs (OpenAI, Anthropic, etc.) or AI agents in production
• Technical English sufficient for documentation and corporate team communication

Who This Is NOT For Junior or early‑career developers - this role requires genuine mid‑senior depth Specialists: pure frontend engineers, pure backend engineers, or pure data engineers Candidates who haven't shipped production code recently or who rely on heavy team scaffolding Anyone who views AI coding tools as a threat rather than a multiplier

Business Unit: Avance

Scheduled Weekly Hours: 40

Number of Openings Available: 1

Worker Type: Regular

Career Site: More About Jonas Software

About Jonas Software: Jonas Software is a leading provider of enterprise management software solutions, serving a wide range of vertical markets including hospitality, healthcare, construction, education, personal care, fitness, leisure, moving and legal services, to name a few. Within these markets, Jonas is comprised of over 65 distinct brands, each a respected leader in its domain. Jonas’ vision is to be the branded global leader across these verticals and to be recognized by customers and industry stakeholders as the trusted provider of “Software for Life.” We are committed to technology, product innovation, quality, and exceptional customer service. Jonas Software supports over 60,000 customers in more than 30 countries. We employ over 6,000 skilled professionals, including industry experts and technology specialists. Across our broader network, we support a global workforce of more than 30,000 employees. Headquartered in Canada, Jonas Software has a global footprint with offices around the world. We’re a 100% owned subsidiary of Constellation Software Inc., based in Toronto, publicly listed on the TSX (CSU.TO), and a member of the S&P/TSX 60 Index.

IS THIS YOU?

At Vesta, we have long realised that our greatest asset is our employee base. As such we strive to provide our team with a fantastic working environment and an enriching career, which we know will translate into world‑class service to our valued clients. This allows Vesta Software Group to maintain and extend our lead as the premier software and services provider in each of our markets. Everyone has heard the sports analogy “to be the best, you have to beat the best”; well at Vesta Software Group we have tweaked that slightly to fit vertical market software. We believe to be the best you have to hire and retain the best!!! Vesta Software Group is an Equal Opportunity Employer. If you need accommodation for a disability at any stage of the application process or want more information on our accommodation policies, contact recruitment at [e-mail] Vesta Software Group is part of a CSI group of companies.