Fullstack Engineer with Frontend focus

AI/Machine Learning Engineer (LLMs/SLMs) Full-Time | Remote | $3,000–$4,000 USD | Senior-Level About the Company We are a Brazilian generative AI startup with global recognition. We were featured at Web Summit Qatar 2025 and won the pitch competition at Web Summit Rio 2024. We were also selected as one of only five startups in a major cloud provider’s 2024 Generative AI Accelerator. This same provider has classified us as one of just eight “true producers” of generative AI in Brazil. Now, we’re developing proprietary technology that puts Brazil at the forefront of AI innovation. The Challenge We’re launching a pioneering project: building a proprietary Small Language Model (SLM) — the first of its kind developed in Latin America — in collaboration with a major cloud infrastructure partner. With exclusive access to NVIDIA B200 GPUs, this is a globally visible initiative and a strategic showcase for our technology and cloud partner. You’ll be a founding technical member of this effort, shaping a model that defines how the region enters the generative AI space. Key Responsibilities Lead continuous pre-training of our proprietary SLM Build fine-tuning pipelines for client-specific use cases Optimize model architecture for compute efficiency Apply quantization and pruning techniques for model deployment Collaborate with cloud partners to document SLM best practices Create use-case-specific evaluation benchmarks Construct and manage high-quality training datasets Contribute to international conferences and publications Requirements Minimum 3+ years of direct LLM training experience, or 5+ years in ML/AI roles Proficiency with PyTorch or JAX Strong knowledge of transformer architectures Experience with distributed training, CUDA, and GPU code optimization Hands-on experience with continuous pre-training, fine-tuning, quantization, and pruning Familiarity with MLOps, versioning, and AWS SageMaker English or Portuguese fluency (one is sufficient) Must be able to work Brazilian business hours, regardless of location Nice to Have Experience building language models from scratch Publications or open-source contributions in NLP/LLMs Familiarity with alignment techniques (RLHF, DPO, Constitutional AI) Experience with Swift, inference optimization, or production deployment Familiarity with major cloud ML platforms What Success Looks Like In your first 3–6 months, success means: Delivering the first version of our SLM architecture Completing domain-specific fine-tuning pipelines Leading early benchmarking and evaluation Building out scalable training datasets Establishing best practices with our cloud partner’s technical team Hiring Process Initial interview with the founder Technical assessment covering real-world problem solving What We Offer Work on the first SLM in Latin America Access to cutting-edge infrastructure (NVIDIA B200 GPU cluster) Direct collaboration with top engineers from our cloud partner 100% remote with flexible hours and minimal meetings Competitive compensation aligned with global markets Full visibility of your work on the international stage Opportunities to publish, present, and attend global events Supportive, innovation-driven team culture Work Format Remote-first Flexible schedule (must overlap with Brazil business hours) Report directly to the founder Culture focused on impact, autonomy, and results Why This Role Is Unique This isn’t just an ML job — it’s a rare opportunity to shape foundational AI infrastructure in Latin America. Your work will influence how the region participates in the global generative AI race. If you’re passionate about solving complex technical challenges at the frontier of language modeling — we want to meet you.

Title: Founding Full-Stack Engineer Set Up: Remote Salary range: $4500 - $6000 About Us: We are on a mission to elevate global consciousness through everyday technology. As our engineer, you’ll join a tight-knit team building the next generation of AI-driven wellness and manifestation tools for millions of users. About the role: As a Software Engineer, you will be instrumental in building the core systems and user-facing features of our application. You will collaborate closely with a multi-disciplinary team to create and refine tools that promote emotional well-being and personal growth. This role requires a proactive and product-minded individual who is passionate about leveraging technology to make a positive impact. Key Responsibilities: Architect and implement scalable backend services.(Python, Node.js, or your language of choice) Drive end-to-end development of user-focused features, from wireframes to polished UI, including personalized meditations, affirmations, and gamified challenges. Partner with design, data science, and marketing to craft features that resonate and scale. Incorporate the latest AI models and iterate daily to refine algorithms for emotional well-being. Contribute to our team culture by sharing ideas, mentoring peers, and helping to shape the future of our product. Requirements: A fast learner with the ability to quickly pick up new technologies and concepts, from Swift to Python or the latest AI APIs. A strong communicator who can speak up, ask questions, and share ideas clearly and logically. Organized and reliable, with the ability to keep track of tasks, set clear priorities, and ship features on time. Possesses a product mindset with the ability to translate user needs into simple, elegant solutions that drive engagement. A team player who can collaborate closely with engineers, designers, and growth marketers. A bias for action and the ability to iterate rapidly—designing, building, testing, and deploying daily in a fast-moving environment. 5-8+ years of experience as a software engineer Previous work on consumer-facing mobile or web products on IOS environments Advanced english is required for this position Cultural Fit: Leadership and Mentorship: Acts as a leader rather than just an individual contributor. Capable of teaching others, conducting code reviews, mentoring, and bringing organizational skills to the team. Continuous Learning: Curious and growth-minded with an active interest in new AI tools, technology trends, and competitive apps in the space. Attention to Detail: Maintains high standards for quality given the consumer-facing nature of the product. Discussion-Based Collaboration: Engages in open discussions without needing to be right. Values team input and consensus-building over individual authority. Bonus Points: Hands-on experience with AI APIs (e.g., Claude, Gemini, Llama) or platforms like Cursor. Familiarity with growth marketing hacks or analytics-driven product optimization. A background in psychology, neuroscience, or contemplative practices. Experience or knowledge, developing apps/tools related to the wellness industry. 

About Us: We are at the forefront of data management solutions, empowering businesses to unlock the full potential of their data. We are a dynamic and innovative company dedicated to delivering high-quality, reliable, and scalable products. Join our growing team and contribute to a culture of excellence and continuous improvement. Position Overview: We are seeking a detail-oriented Part-Time QA to be our sole quality assurance resource. In this remote role, you will conduct the final quality review for our weekly software releases, responsible for identifying and tracking bugs to ensure our products meet high-quality standards. This position offers a flexible schedule perfect for a self-sufficient professional, with great opportunities to grow within the company.  Key Responsibilities: Perform various types of hands-on manual testing for weekly software releases, including functional, regression, and integration testing. Improve test plans, QA processes and building automated test coverage Identify, document, prioritize, and track bugs and issues using our bug tracking system (Trello). Verify bug fixes and ensure issues are resolved effectively. Collaborate closely with development and product teams to understand requirements and ensure testability of features. Participate in review meetings (e.g., daily stand-ups) to provide QA insights and feedback. This is not a client-facing position. Contribute to the continuous improvement of QA processes, methodologies, and tools. Understanding agile development methodologies (Scrum) Required Skills & Experience: 3-5+ years of experience in Quality Assurance for web-based applications or software products. (Mid level or Semi Senior) Solid understanding of QA methodologies, tools, and processes, with a strong emphasis on manual testing. Experience with creating clear, concise, and comprehensive test plans and test cases. Proficiency in identifying, documenting, and tracking defects in systems like Trello. Strong analytical and problem-solving abilities with a keen attention to detail. Proven ability to work independently and manage time effectively in a remote, part-time setting as a sole QA resource. Desirable Skills: If you can write end-to-end tests in Playwright to help build out the automated testing of our UI.  Familiarity with version control systems (e.g., Git). Experience with API testing (e.g., Postman). Basic understanding of SQL for data validation. Intermediate English is required (written and spoken) - Business/tech English will be needed.