Optical Engineer with Python Expertise - Freelance AI Trainer

We invite you to submit your CV in English, detailing your proficiency in the language.Mindrift serves as a vital link between specialists and project-oriented AI opportunities with top-tier technology firms, concentrating on the evaluation, testing, and enhancement of AI systems. Note: Participation is project-based and does not lead to permanent employment…

We invite you to submit your CV in English, along with details of your English proficiency level.At Mindrift, we specialize in connecting top-tier professionals with project-based AI opportunities for leading technology firms. Our focus is on the assessment, evaluation, and enhancement of AI systems through innovative contributions from specialists. This role is project-based and does not offer permanent employment.Key Responsibilities:As a contributor, you will engage in various project-specific tasks, which may include:Creating original optical problems that accurately simulate real-world physics research workflows;Designing computationally demanding challenges that require extensive timeframes to solve;Formulating complex problems that necessitate advanced reasoning in mechanics, electromagnetism, thermodynamics, and quantum mechanics;Base your problems on actual research challenges or relevant practical applications in optics and physics;Clearly document problem statements and provide verified correct solutions.Ideal Candidate Profile:This opportunity is well-suited for optical engineers looking for flexible, part-time non-permanent projects. The ideal candidates will possess:A degree in Physics (Theoretical, Experimental, or Computational) or a related discipline;At least 2 years of relevant professional experience, including applied, research, or teaching roles;Proficiency in numerical simulation methodologies;Capability to design problems that reflect authentic physics research processes;Innovative thinking in problem creation across various physics domains;Familiarity with physics modeling and approximation methods;Strong command of written English (C1+ level).Application Process:Interested candidates should apply, pass the necessary qualifications, join a project, complete assigned tasks, and receive compensation for their contributions.Workload Expectations:During active phases of projects, contributors should anticipate committing approximately 10–20 hours per week. Please note that this is an estimate and the actual workload may vary based on project needs.Compensation:Contributors can earn up to $14 per hour, depending on their experience level and contribution pace. Compensation may differ across projects based on their complexity, scope, and expertise required.

Role overview Toloka AI seeks a freelance AI Trainer who combines civil engineering experience with strong Python programming skills. This contract position is fully remote, with work based in Belo Horizonte, State of Minas Gerais, Brazil. What you will do Guide and support others in civil engineering topics and Python programming as part of AI-focused projects. Help develop and refine methods for AI training. Apply your expertise to influence how new AI tools are built for the civil engineering field. Location This is a remote role tied to Belo Horizonte, State of Minas Gerais, Brazil.

Please submit your CV in English and indicate your English proficiency level. toloka-ai, through the Mindrift platform, offers project-based freelance work focused on evaluating, testing, and improving AI systems for leading technology companies. This is not a permanent position; assignments are tied to specific projects. Key responsibilities Create original optics challenges that reflect real research processes in physics. Design computationally intensive problems that require computer-based solutions. Develop tasks involving advanced reasoning in mechanics, electromagnetism, thermodynamics, and quantum mechanics. Base problem sets on real-world research questions or practical scenarios in optics and physics. Document problem statements clearly and provide accurate, verified solutions. Requirements Degree in Physics (theoretical, experimental, or computational) or a closely related field. Minimum of 2 years in applied, research, or teaching roles. Experience with numerical simulation methods. Ability to construct problems that mirror authentic research approaches in physics. Creative mindset for developing problems across various physics domains. Knowledge of physics modeling and approximation techniques. Strong written English skills at C1 level or higher. Project workflow Apply Pass qualification steps Join a project Complete assigned tasks Receive compensation Time commitment During active projects, expect to dedicate approximately 10 to 20 hours per week. Actual hours may vary and are only required while a project is in progress. Compensation Rates are up to $14 per hour, depending on experience and the complexity of the tasks. Compensation may differ between projects based on their requirements. Location This freelance remote position is based in Belo Horizonte, State of Minas Gerais, Brazil.

Empowered by individuals transforming education All positions at Arco are eligible for People with Disabilities. We are Arcotech, the technology team at Arco Educação. We develop digital solutions that enable students, parents, and schools to collaborate for a more dynamic and effective learning experience. Here, we gather talents who are passionate about technology and education. We believe that together we can merge these two forces to enhance the learning experience. Our goal goes beyond innovation; we aim to amplify the impact of education on individuals, which drives us forward. Through learning solutions, insights, and relationships, we help schools become better, larger, and more engaging for students, educators, and families. #JOINUSATARCO #BECOMETECH Now that you've captured a bit more of our essence, let’s talk about the opportunity!

Please submit your CV in English and indicate your level of English proficiency.At Mindrift, we specialize in connecting talented professionals with dynamic, project-based AI opportunities for top tech companies. Our focus is on testing, evaluating, and enhancing AI systems. Please note that participation is project-based and not a permanent employment position.What You Will Do:As a contributor, you will engage in various projects that may include:Designing original computational engineering problems that replicate authentic engineering workflows;Creating problems that necessitate Python programming for engineering calculations and simulations;Ensuring that problems are computationally intensive and involve numerical methods or iterative solutions;Developing problems centered on system design, optimization, and analysis;Base problems on genuine research challenges or practical applications in engineering;Verifying solutions using Python with established engineering libraries;Clearly documenting problem statements and providing verified correct answers.Your Qualifications:This role is ideal for engineers with experience in Python who are open to part-time, non-permanent projects. The ideal candidate should possess:A degree in Mechanical Engineering or a related field;Proficiency in Python for numerical validation; knowledge of MATLAB, R, C, SQL, Numpy, Pandas, SciPy, domain-specific libraries, Stata, or any programming language can be considered equivalent;At least 2 years of professional experience, with applied, research, or teaching experience being applicable;A solid understanding of practical engineering constraints and approximations;Excellent written English skills (C1+ level);Professional certifications (e.g., CMME, SAS Certifications, CAP) and experience with international or applied projects are advantageous.How the Process Works:Apply → Pass qualifications → Join a project → Complete tasks → Get compensated.Project Commitment:Tasks are expected to require approximately 10–20 hours per week during active project phases, depending on project demands. This is an estimate and not a guaranteed workload, applicable only while the project is ongoing.Compensation:Contributors can earn up to $14 per hour, depending on their level of expertise and contribution pace. Compensation varies across projects based on scope, complexity, and required skills. Please be aware that other projects may offer different earning potentials based on their specific needs.

Are you a skilled Data Scraping Engineer with a passion for Python? Join our dynamic team at Toloka AI, where you will play a crucial role in extracting and processing data from various online sources. This freelance position offers the flexibility of remote work while allowing you to contribute to innovative projects.

About Tag Software GroupAt Tag Software Group, we are an exceptional team of seasoned investors and operators committed to acquiring, enhancing, and expanding mission-critical software companies that serve small and medium-sized businesses (SMBs), large enterprises, and the public sector.As a proud division of Valsoft Corporation, Tag provides a lasting home for software companies — our acquisitions are focused on sustainable growth, not reselling. Our aim is to cultivate enduring partnerships that safeguard your legacy, your workforce, and your clients.Our dedicated in-house team guarantees a speedy, transparent, and seller-friendly process, ensuring timely closings. Once integrated into TAG, your business will thrive with established best practices, specialized value-creation resources, and access to our extensive ecosystem of sister companies, including proprietary innovations like ValPay and Sadie AI to propel your business forward.CultureTag Software Group is more than just a workplace — we are a cohesive team that values our people as our greatest asset. Investing in our staff is our foremost priority.We strive to create an atmosphere where employees feel the thrill of their first day on the job, every single day, fostering a culture of high performance and collaboration. We celebrate our successes and take pride in our achievements. We Dream Big, Stay Humble, and Stay Hungry.The OpportunityThe AI Product Engineer is pivotal in developing innovative AI-driven products, significantly contributing to our technological advancement.With an entrepreneurial mindset, this role emphasizes rapid development, iterative experimentation, and delivering solutions that have a clear and measurable impact on the business. You will oversee the entire product lifecycle — from initial ideation and prototyping to deployment, scaling, and optimization.This hands-on position is perfect for someone who thrives in ambiguous situations and enjoys transforming concepts into market-ready tools.If you are passionate about building AI systems, delivering features, experimenting, and converting vague ideas into tangible products, we want to hear from you.

Role Overview bv is looking for a Senior AI Engineer in São Paulo. This position focuses on designing and building advanced artificial intelligence solutions. The work aims to create real impact across industries. What You Will Do Develop AI-driven systems and models for practical applications Work closely with a skilled team to solve complex technical challenges Contribute expertise to projects that aim to advance technology Team and Culture Join a group of professionals who value collaboration and technical excellence. The team is committed to exploring new possibilities in AI and delivering results that matter.

Econodata is a leading startup in B2B Sales Intelligence in Brazil!Founded by alumni of UFRGS and backed by Telefônica Group, we develop a platform that leverages AI and Big Data to convert data into actionable B2B commercial intelligence.With a database of over 24 million companies and more than 4,000 clients including LinkedIn, PagBank, TOTVS, Vivo, Unimed, and BASF, we empower sales teams to identify the right leads for successful sales.Here, technology is at our core: you will work with large volumes of data, solve real-world problems, and witness the direct impact of your contributions.Our Technology team is expanding, and we are looking for an AI Engineer to join us, motivated to work with agile methodologies in a rapidly growing startup!Responsibilities include:Fine-tuning pre-trained models for specific applications or datasets;Collecting, pre-processing, and managing large datasets necessary for training generative models;Executing data augmentation and feature engineering to enhance model performance;Designing scalable and efficient AI systems and architectures.

We invite you to submit your CV in English, including your English proficiency level.Mindrift connects talented specialists with project-based AI opportunities at leading technology companies, focusing on the testing, evaluation, and enhancement of AI systems. Please note that participation is project-based and does not constitute permanent employment.Overview of the OpportunityEach project will have distinct tasks, and contributors may be required to:Design innovative engineering problems that accurately represent real engineering processes;Develop Python-based solutions for engineering calculations and simulations;Create computationally intensive problems that necessitate numerical methods or iterative problem-solving;Work on system design, optimization, and analysis challenges;Base problems on actual research issues or real-world engineering applications;Utilize Python with standard engineering libraries to verify solutions;Clearly document problem statements and provide verified correct answers.Qualifications We SeekThis role is ideal for engineers with Python expertise who are interested in part-time, project-based work. The most qualified candidates will possess:A degree in Electrical Engineering or a related field;Proficiency in Python for numerical validation, with familiarity in MATLAB, R, C, SQL, Numpy, Pandas, SciPy, or other domain-specific libraries being advantageous;A minimum of 2 years of professional experience, which can include applied work, research, or teaching;A solid understanding of practical engineering constraints and methodologies;Strong written English communication skills (C1+ level);Professional certifications (e.g., CMME, SAS Certifications, CAP) and experience in international or applied projects are highly valued.How the Process Works1. Apply → 2. Pass qualification(s) → 3. Join a project → 4. Complete tasks → 5. Get compensatedProject Time ExpectationsFor this opportunity, tasks are estimated to require approximately 10–20 hours per week during active project phases, based on specific project needs. Please note that this is an estimate and not a guaranteed workload, applicable only while the project is active.CompensationContributors can earn up to $14 per hour, depending on their expertise and contribution level. Compensation may vary across projects based on scope, complexity, and required skills. Please note that different projects on the platform may offer varying compensation levels.

Composed of individuals who transform education All positions at Arco are eligible for People with Disabilities. We are Arcotech, the technology team at Arco Educação. We develop digital solutions that enable students, parents, and schools to collaborate for a more dynamic and effective learning experience. Our team brings together talent that is passionate about technology and education. We believe that together, we can merge these two forces to enhance the learning experience. Our goal is to go beyond innovation; we aim to amplify the impact of education on people's lives, which is what drives us. Through learning solutions, estimations, and relationships, we help schools become better, larger, and more delightful for students, educators, and families. #VEMPRAARCO #VEMSERTECH Now that you understand a bit more about our essence, let's talk about the opportunity? What will your challenges be with us?Exploratory analyses, data visualization for business understanding, and use of LLM applications;Development of AI applications with Vector Databases, LLMs, Single agents, and Multi agents;Creating validation pipelines for LLM applications, including datasets and LLM-as-a-judge;Development of data pipelines;Building small back-end and front-end components for LLM application concept validation;Reading technical blogs, conference videos, and papers to generate hypotheses for improving LLM applications. What we expect you to have:Experience in Data Science, Machine Learning Engineering, or with LLM APIs;Professional experience in communicating technical topics related to Software Engineering, Data Science, or LLMs;Familiarity with Python, Git, and good Software Engineering practices;English (Intermediate/Advanced) for studying technical blogs and documentation.

Salary: $50,000 - $120,000 per year (Gross in USD)About Sezzle:Sezzle is on a mission to empower the next generation financially by transforming the shopping experience beyond traditional payments. We combine innovative technology with seamless, interest-free installment plans to make shopping smarter and more accessible. Our goal is to redefine how consumers discover, interact with, and purchase the products they love, driving significant impact on merchant sales through enhanced conversions and increased order values. As we continue to innovate in the fintech and retail space, we are building a passionate, dynamic team focused on creating a unique shopping journey that goes beyond mere transactions. If you are excited about pushing technological boundaries and delivering transformative experiences for both consumers and merchants, we invite you to join us at Sezzle and help shape the future of shopping!About the Role:We are in search of a highly skilled and motivated Senior AI Engineer with exceptional intelligence and emotional acumen. This role offers an exciting opportunity to thrive in a fast-paced environment within a rapidly growing team, providing ample opportunities for career advancement.Your primary responsibilities will include designing, developing, and deploying machine learning models that enhance our financial platform. You will spearhead the creation of scalable machine learning solutions for personalized recommendations in the Sezzle marketplace, fraud detection, and credit risk assessment, leveraging a mix of cloud services, open-source tools, and proprietary algorithms.As a leader, you will play a crucial role in integrating machine learning development and operations (MLOps) to automate and optimize the lifecycle of our ML models. Collaborating with engineers and data scientists, you will develop large-scale, high-quality solutions that address various challenges in the shopping and fintech sectors. Your efforts will ensure that our AI-driven features are robust, efficient, and scalable as we continue to expand.

Encora is hiring a Fullstack AI Engineer based in Brazil. This position centers on building and maintaining full-stack applications that use artificial intelligence to address practical challenges. What you will do Develop and support full-stack software using AI technologies. Work closely with teams from different disciplines to define, design, and launch new features. Improve application performance, focusing on speed and scalability. Keep up with new trends and advances in AI and software development. Team culture Encora values a collaborative and inclusive workplace. The company encourages innovation and aims to create an environment where new ideas are welcome.

About Tag Software GroupTag Software Group is a collective of seasoned investors and operators committed to acquiring, enhancing, and expanding mission-critical software companies that serve small and medium-sized businesses (SMBs), large enterprises, and the public sector. Founded under the umbrella of Valsoft Corporation, TAG provides a lasting home for software companies, focusing on long-term partnerships that preserve your legacy, your workforce, and your clientele.Our dedicated in-house team ensures a seamless, transparent, and seller-friendly process, guaranteeing efficiency and confidence in closing deals. Once integrated into TAG, your company gains access to proven best practices, specialized resources for value creation, and the expansive ecosystem of our sister companies, including proprietary technologies like ValPay and Sadie AI to propel your business to new heights.Company CultureAt Tag Software Group, we believe our people are our greatest asset. We prioritize investing in our team, creating an environment where employees experience the thrill of their first day on the job, every day. We foster a culture of high performance and collaboration, celebrating our successes and taking pride in our achievements. We Dream Big, Stay Humble, and Stay Hungry.The OpportunityThe AI Process Engineer is instrumental in refining, modernizing, and automating business processes through artificial intelligence. Instead of creating new external products, your focus will be on enhancing operational efficiency, optimizing workflows, and implementing intelligent automation throughout the organization.This position is perfect for individuals who relish the challenge of solving business problems with technology, improving processes, and operationalizing AI at scale.

About Darwin AIDarwin AI revolutionizes the way mid-market companies operate by integrating AI-driven digital workers that automate vital business processes through WhatsApp. Our intelligent AI workers adeptly manage crucial customer interactions such as qualification of inbound inquiries, reactivation of outbound communications, satisfaction surveys, appointment scheduling, payment collections, and much more. Uniquely, we offer the sole no-prompt AI solution available, allowing businesses to harness the power of AI without the need for specialized technical skills or teams, ensuring effortless integration and immediate results.Be part of a dynamic and rapidly growing team that's reshaping the perception of AI and technology in the business landscape!Internship RoleWe are seeking a motivated individual who is eager to contribute to scaling our business tenfold and has a keen interest in technology and AI. This position is perfect for a student keen on gaining insights into Software, AI, and B2B environments.We are excited to connect with ambitious and inquisitive individuals who are ready to make a meaningful impact on our Customer Support team.

Toloka-AI seeks a Computer Science Specialist with advanced Python expertise to join AI-focused initiatives. This fully remote role is based in Belo Horizonte, State of Minas Gerais, Brazil, and centers on building impactful systems in artificial intelligence. What you will do Work closely with a team to design and develop AI-driven solutions Create and maintain Python-based systems that address practical challenges Contribute to projects that push forward AI capabilities at Toloka-AI Requirements Solid foundation in computer science principles High level of proficiency in Python programming Genuine interest in advancing AI with real-world applications Ability to collaborate effectively in a remote setting

About Power Digital Marketing Power Digital Marketing is a growth agency working across marketing, consulting, and data intelligence. The team supports both established and emerging brands worldwide, focusing on driving revenue and building brand awareness. The company values a people-first culture, welcoming diverse backgrounds and experiences. Integrity, autonomy, and tenacity guide the team’s approach to innovation and results. Power Digital offers services including SEO, content marketing, paid media, social media, programmatic and CTV, public relations, influencer marketing, email and SMS, conversion rate optimization, retail marketing, and creative solutions. The agency’s proprietary technology, nova, uses first-party data to deliver business insights, helping clients plan marketing investments and conduct due diligence for mergers and acquisitions. With billions managed in media spend, Power Digital’s team of marketers, creatives, analysts, and technologists use data science and testing to improve every stage of the customer journey. Role Overview: AI Data Engineer Location: Remote – Brazil English proficiency (spoken and written) at an advanced level is required. What You Will Do Build and maintain data engineering solutions that support Power Digital’s internal AI platform. Manage the full data lifecycle, from raw data ingestion to producing AI-ready outputs and features. Work closely with data science and product teams to ensure data systems enable functional AI capabilities across the organization.

Toloka AI seeks a Strategy Consultant with expertise in AI training and evaluation. This is a remote role based in Belo Horizonte, State of Minas Gerais, Brazil. The focus is on advising organizations as they refine their AI strategies and enhance training programs. Key responsibilities Guide companies in shaping and improving their AI training and evaluation processes Offer insights to support informed decisions for AI-related projects Assist clients in building stronger AI capabilities and refining their methodologies Location This position is remote, with a focus on candidates in Belo Horizonte, State of Minas Gerais, Brazil.

Join Our TeamOur Mission: To position Brazil as a global leader in artificial intelligence.At Enter, we merge human expertise with artificial intelligence to scale critical, high-volume tasks that still rely on manual processes. Our platform empowers large enterprises across Latin America to manage complex workflows, starting from legal operations and expanding throughout the enterprise. We leverage AI to create tailored legal defenses at scale, aiding companies in reducing costs while enhancing their success rates in litigation.Our team is comprised of the finest talents from renowned institutions across Brazil and beyond, including Harvard, UPenn, Stanford, ITA, USP, and Unicamp. We collaborate with industry giants such as Meta, Itaú, Mercado Livre, Latam, Airbnb, Santander, iFood, and Nubank to handle critical processes more efficiently. With over R$300M raised in capital and a valuation of R$2B, we are backed by esteemed investors like Sequoia and Founders Fund who share our vision for the future.Position OverviewAs a Junior Software Engineer at Enter, you will play a pivotal role in laying the groundwork for our AI agent platform. Your responsibilities will include tackling scalability challenges, processing large datasets, and building robust systems that support critical applications in production. You will work on backend systems, machine learning, and large language models (LLMs). While prior experience in all areas is not required, a strong curiosity and the ability to learn quickly are essential.Key ResponsibilitiesDesign and develop systems that support the AI agent platform, ensuring high availability and performance.Address scalability challenges, ensuring the platform evolves with increasing demand and complexity.Create solutions for efficient processing of large volumes of data while ensuring integrity, security, and accessibility.Collaborate with AI teams to integrate machine learning models and LLMs into the platform, facilitating the development and management of intelligent agents.Participate in code reviews and advocate for best development practices, continuously elevating software quality.