Senior Product Software Engineer

About Koltin At Koltin, we are redesigning care for older adults to help them remain healthy and independent. We offer health memberships providing personalized, preventive care and long‑term well‑being support. We are the first company in Mexico to offer health memberships that include major medical insurance coverage for older adults (up to 84 years old), backed by BBVA Seguros Salud. About the Role: Senior Software Engineer We are seeking a product‑driven Senior Software Engineer to drive projects end‑to‑end, focusing on impact from unclear problems to shipped solutions. This role involves working across the stack as needed, partnering closely with product, design, data, and operations. Success requires partnering with product to frame problems and delivering secure, reliable, and maintainable systems through production. Candidate Profile You are a good fit if you: Identify with our Engineering Values: Ownership, Collaboration, Growth, Excellence, Sustainability. Drive end‑to‑end delivery of complex features or critical workflows. Lead debugging of complex production issues calmly, utilizing metrics, logs, traces, and data inspection to test hypotheses and find root causes. Support other engineers through mentorship, pairing, and code reviews. Ensure data integrity and confidentiality, including relevant observability and auditing. Care deeply about engineering excellence (reliability, testing, maintainability). Are comfortable working across the stack while developing depth in one or two areas over time. Required Skills & Experience Approximately 5+ years of experience building and shipping production software. Experience with web applications, APIs, and relational databases. Strong fundamentals in system design, debugging, and data modeling. Experience working with a mainstream language and web framework (e.g., PHP & Laravel, Ruby on Rails, Elixir & Phoenix). Solid experience with SQL and relational databases (e.g., MySQL/MariaDB, PostgreSQL). Experience writing automated tests (unit, integration, and end‑to‑end where appropriate). Experience collaborating in multidisciplinary teams (product, design, data, ops). Comfort operating in a high‑ownership environment with changing priorities and quick iteration. Current Stack: PHP & Laravel, MariaDB, Vue.js, Inertia, Tailwind. Note: Experience with the current stack is a plus, not a requirement. We prioritize judgment and fundamentals over specific tools. Key Outcomes Projects you lead move reliably from problem framing to production (typically 1–4 weeks), delivering clear value to users and the business. Complex problems are broken down into well‑scoped phases, with risks and trade‑offs surfaced and managed early. Technical decisions balance simplicity, reliability, and maintainability, resulting in systems that are easy to operate and evolve. The quality of the codebase and production systems improves through your contributions (structure, testing, observability). The team benefits from reusable patterns and shared solutions that reduce duplication and cognitive load. Perks & Benefits Access to professional development tools and resources (courses, books, workshops, etc.). Unlimited virtual medical assistance (general practitioner, nutritionist, psychologist) for you and 3 family members. Access to physical wellness tools (TotalPass). 9 extra vacation days per year in addition to the legal minimum. Private Major Medical Insurance. All the equipment needed to do your best work. $500 MXN monthly support for home office expenses. One‑time $2,000 MXN support to set up your home workspace. We encourage applications even if you do not meet every requirement listed. #J-18808-Ljbffr