Summary: Join a cross-functional product team to contribute to meaningful, sustainability-driven Certificate and Offset Management solutions with real-world impact. Highlights: 1. Contribute to meaningful, sustainability-driven products with real-world impact 2. Collaborate with international teams on innovative environmental solutions 3. Design and build full-stack web applications with modern technologies **Impressit** is looking for a **Senior Full\-Stack Software Engineer** to join a cross\-functional product team working on Certificate and Offset Management solutions within a Nature and Environmental Solutions IT portfolio. This is a great opportunity to contribute to a meaningful, sustainability\-driven product with real\-world impact, supporting end\-to\-end management of carbon offsets, renewable energy certificates, and green gas solutions, while collaborating with international teams. **Location:** Portugal (on\-site or hybrid) **Start Date:** ASAP **What do we expect?** — 5\+ years of commercial experience as a **Senior Full\-Stack Software Engineer** — Strong hands\-on experience with **JavaScript / TypeScript** — Deep knowledge of **Node.js, React**, and modern full\-stack architecture — Solid experience with **GraphQL**, REST APIs, and scalable web applications — Proven experience with **cloud platforms (AWS or Azure)** in production environments — Strong experience working with **databases (SQL and/or NoSQL)** — Advanced skills in writing and maintaining **automated tests** (Jest or similar) — Strong understanding and practical use of **CI/CD pipelines** — Excellent problem\-solving, analytical, and debugging skills — Strong Computer Science fundamentals (data structures, algorithms, OOP, system design) — User\-centric mindset with a strong focus on **performance, accessibility, and UX** — Excellent communication skills and experience working in **cross\-functional, distributed teams** — **Upper\-Intermediate or higher level of English** — **Must be located in Portugal** **What will you do?** — Design and build **full\-stack web applications** using **Node.js, React, TypeScript, GraphQL, CSS, Webpack** — Develop **robust, scalable, and well\-tested services**, ensuring high code quality — Take ownership of features end\-to\-end, from design to production — Collaborate closely with engineers, product managers, designers, and vendors — Drive and improve **CI/CD processes** and cloud\-based solutions — Actively contribute to **system architecture and technical decisions** — Ensure **performance, accessibility, security, and usability** of applications — Mentor team members and promote best engineering practices **As a plus:** — Experience with **GraphQL**, Webpack, or similar advanced tooling — Background in **sustainability, energy, or environmental domains** — Passion for **clean code**, engineering excellence, and high\-quality user experiences Job Type: Full\-time