Mid-Level Software Engineer Fullstack

Location: San José, Costa Rica

Department: Technology & Data Sciences

About Us:

We are a data-driven solutions company building the KYU Intelligence Platform (KIP), delivering actionable insights to drive strategic decisions. Our technology stack spans modern Python backends, React/TypeScript frontends, and REST APIs with GraphQL capabilities. We empower our engineers with AI-assisted development tools like Claude Code, fostering a culture where human expertise and AI augmentation work together to build exceptional software.

Role Overview:

We're seeking a Software Engineer 2 with full-stack capabilities and an AI-philic mindset to join our growing team. You'll work across both frontend and backend systems, implementing features while collaborating closely with senior engineers who will help guide your technical growth. The ideal candidate has solid fundamentals in both Python and TypeScript/React, enjoys working across the stack, and is eager to deepen their expertise. You embrace AI-assisted development as a learning accelerator while building the foundational skills needed to work effectively with and without AI tools.

Responsibilities:

• Implement features spanning frontend and backend systems following established patterns
• Build and maintain REST API endpoints and integrate them with React applications
• Write efficient, clear, and safe code that follows team best practices
• Use AI assistants effectively while developing strong foundational skills that enable you to evaluate and improve AI-generated solutions
• Write comprehensive tests for your code and fix bugs in existing systems
• Participate in code reviews, both giving and receiving constructive feedback
• Collaborate with senior engineers to understand system architecture and design decisions
• Ask clarifying questions and request assistance when tackling complex problems
• Provide reasonable estimates for development tasks
• Troubleshoot and debug issues across the application stack

Required Skills & Experience:

• 2+ years of professional software development experience
• Solid proficiency in Python 3 with modern practices and type hints
• Solid proficiency in TypeScript/JavaScript and React
• Experience with micro-web-frameworks such as FastAPI, Flask, or similar
• Working knowledge of ORM technologies (SQLAlchemy or similar)
• Familiarity with component libraries such as Shadcn/UI or similar
• Understanding of HTML5, CSS3, and responsive design principles
• Understanding of RESTful API design principles
• Openness to AI-assisted development and learning to use tools like Claude Code
• Proficiency with Git, command-line tools, and collaborative development workflows
• Strong problem-solving skills and willingness to learn
• Clear communication and ability to ask productive questions

Preferred Qualifications:

• Computer Science degree or equivalent practical experience
• Familiarity with modern build tools and bundlers (Vite, webpack)
• Experience writing unit and integration tests
• Understanding of web accessibility standards (WCAG)
• Exposure to containerization technologies (Docker)
• Experience with cloud platforms (AWS, GCP, or Azure)
• Familiarity with state management patterns (Redux, Zustand, or similar)
• Experience with testing frameworks (Vitest, Jest, React Testing Library)
• Understanding of web performance basics

What We Offer:

• Competitive salary and comprehensive benefits
• Access to cutting-edge AI development tools
• Mentorship from senior engineers and clear growth path to Senior Engineer
• Flexible work arrangements
• Professional development opportunities
• Collaborative and supportive team culture
• Opportunity to work on impactful, data-driven products

**All applications must include a Resume & Cover Letter in English to be considered. 

Kepler is a people first organization. If this roles piques your interest but you may not check every box, we still encourage you to apply! Studies show that imposter syndrome can prevent women and people of color from applying unless they meet every single qualification. We welcome all who are interested to apply, you just might be a great candidate for this role or others.

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