Location: Belgium (Louvain-La-Neuve) Your responsibilities: As Software Test Engineer you will play a key role in ensuring the quality, reliability, and performance of our software products. You will design and execute test strategies, build and maintain automated test suites, and work closely with developers, product managers, and stakeholders to deliver high-quality releases. You will lead quality initiatives, and contribute to continuous improvement of testing processes. Who are we? One2Treat is a fast-growing tech start-up based in Louvain-la-Neuve, Belgium. We develop innovative solutions for biopharmaceutical companies to integrate multidimensional patient needs into clinical development steps and support holistic treatment decisions. To achieve this, One2Treat is building an integrated SaaS platform, based on advanced statistical and AI models, designed to bring patient-centricity to the heart of Pharma R&D. One2Treat Voice captures patient preferences and helps identify and prioritize the outcomes that matter most to patients and clinicians. This enables sponsors to pre‑specify a multidimensional endpoint aligned with real‑world priorities. One2Treat Insights enables pharma R&D teams to analyze and interpret clinical trial data, informing strategic decision‑making based on the totality of evidence (e.g., dose optimization, go/no‑go decisions). By combining these tools, One2Treat supports smarter clinical trial design and more informed benefit and risk assessments, ultimately aligning clinical development objectives with what truly matters to patients and clinicians. What You'll do: 1- Test strategy & planning Analyze requirements, specifications, and technical designs to define test needs. Create comprehensive test plans, test cases, and test scenarios for manual and automated testing. Define and maintain test documentation aligned with QA processes and industry standards. 2- Manual Testing Execute functional, regression, integration, exploratory, usability and acceptance tests. Identify, document and track defects using issue-tracking systems (e.g., GitHub). Validate fixes and ensure consistent reproduction of issues. Collaborate with product and engineering teams to clarify expected behavior and edge cases. 3- Automated Testing Design, implement, and maintain automated test scripts for UI, API, and backend systems. Build scalable and maintainable automated test frameworks (e.g., Cypress, Puppeteer, Playwright, Selenium, Postman/Newman, PyTest, etc.). Integrate automated tests within CI/CD pipelines (e.g., GitHub Actions, GitLab CI). Monitor automation execution and optimize test performance and reliability. 4- Quality Advocacy & Collaboration Participate in requirement reviews, design sessions. Act as a quality advocate across the software development lifecycle. Contribute to continuous improvement of Quality Advocacy processes, tools, and standards. Mentor team members in best practices for testing and test automation (senior level). Expected behaviors: Proactively seeking to understand customer needs and listen to feedback. Team collaboration. Works independently but proactively seeks support and involves colleagues at the right moments to ensure efficiency Alignment with O2T vision. What we're looking for: Bachelor's or Master's degree in Computer Science, Engineering, or related field, or equivalent experience. Proven experience in software testing (3+ years for medior level, 8+ years for senior). Strong understanding of software QA methodologies, tools, and processes. Hands-on experience with manual functional and regression testing. Solid experience with test automation tools and scripting languages (e.g., TypeScript, Python, etc.). Experience with REST APIs and tools such as Postman or Swagger. Familiarity with CI/CD systems and Git. Excellent analytical, debugging, and problem-solving skills. Strong communication skills and ability to work in cross-functional teams. Nice to have: Experience testing SaaS or cloud-native applications (AWS/Azure/GCP). Knowledge of performance testing (e.g., Locust). Experience with security testing or static code analysis tools. Experience in regulated environments (e.g., GxP, ISO standards) — if relevant to your organization. Why Join One2Treat? At One2Treat, we're on a mission to rethink how treatment decisions are made in pharma R&D. By joining us, you become part of a fast‑growing, purpose‑driven tech startup shaping a new standard for patient‑centric clinical development. What We Offer? Impact with purpose: Build tools that help pharma teams make more comprehensive, patient-centered decisions. Growth & development: Play a key role in an expanding team with room to grow skills, responsibilities, and career trajectory. Autonomy & ownership: High independence to shape GTM strategy and influence product, commercial, and customer directions. Collaborative culture: Work with a mission driven team that values transparency, initiative, and collective success. Flexibility & balance: Hybrid model (up to 50% remote after onboarding) with a supportive, creative work environment. Attractive Package: o Competitive salary with performance-based bonus o Health & group insurance o Mobility budget or company car & fuel card o Phone & subscription o Net allowances including representation fees o Meal vouchers o Stock options plan o … and more Our culture Our team is guided by seven core values that shape how we operate, collaborate, and grow. Living these values is key to thriving at One2Treat and contributing to our collective success. Ready to Make a Difference? Join us and help bring truly meaningful, patient‑centric decision‑making to clinical development.