--- title: 'Project Lion - Lead Prompt Engineer - United States (Remote, Part-Time) at Welo Global' canonical: 'https://feeny.ai/job/project-lion-lead-prompt-engineer-united-states-remote-part-time-welo-global-agxas56q50te' type: 'job' last_seen: '2026-09-14' --- # Project Lion - Lead Prompt Engineer - United States (Remote, Part-Time) at Welo Global - **Company:** Welo Global - **Location:** United States - **Employment:** freelance - **Work type:** remote - **Posted:** 2026-03-16 - **Last confirmed live:** 2026-09-14 - **Apply:** https://jobs.lever.co/weloglobal/23ae2577-3a30-406f-8c67-036e02ad758e ## Job description We are looking for an experienced Lead Prompt Engineer to guide and manage a team through the full technical migration process, transitioning templates to LLM autoraters. In this role, you will leverage advanced prompt engineering techniques and the client’s internal tools to optimize model performance, ensuring the successful integration and ongoing enhancement of AI systems. As the team lead, you will drive the strategy, mentor junior engineers, and play a key role in shaping the future of our AI-driven solutions. Responsibilities: - Utilize Automatic Prompt Generation (APG) tools to create baseline prompts for complex parent-child template clusters. - Run and supervise Automated Prompt Optimization (APO) tool, review the outputs, and flag when the APO reaches deadlocks or plateaus. - Manually draft, test, and refine prompts to navigate complex template architectures, overcome anti-patterns, and handle edge cases where tooling is lacking or broken. Solve edge-case scenarios by designing and refining manual prompts. - Monitor shadowbot runs to ensure sufficient disagreements (between human and LLM ratings) are registered, generated, and tracked. - Run prompt versions against established gold data to continuously measure autorater quality against the human crowd baseline, calculating accuracy metrics such as F1 scores, precision, and recall. - Draft technical launch readiness justifications (Launch Certification Documentation) for final. Requirement: - Language Skills: Native fluency in English. - Location: Must be based in United States. - Education: Master’s, or Doctorate degree in Computer Science, Data Science, Computational Linguistics, Human-Computer Interaction (HCI), Cognitive Science, or a related analytical field. - Prompt Engineering & AI Expertise: At least 7 years' experience as Prompt Engineer. Proven experience tuning Large Language Models (LLMs) for strict, structured outputs, complex classification tasks, and familiarity with chain-of-thought and few-shot learning. - Data Analysis: Strong proficiency in identifying error patterns, analyzing model performance, and using SQL or other data analytics tools. - Technical Agility: Ability to quickly learn and master proprietary tools with minimal supervision. - Communication: Excellent verbal and written communication skills. Optional / Preferred Skills: - Familiarity with enterprise-grade LLM interfaces like the Goose API. - Experience in AI model evaluation, data science, computational linguistics, or software engineering. - Hands-on experience with Automated Prompt Optimization (APO) systems or tuning workflows. - Linguistic expertise, including an understanding of semantics and logic. ## About Welo Global ## Company Overview - **One-liner**: Welo Global delivers enterprise localization, AI training data, multilingual content, and intellectual property solutions through a portfolio of specialized global brands. - **Entity Type**: Private (Privately Held) - **Headquarters**: Not publicly available (global operations across multiple countries) - **Founded**: Not publicly available (earliest known employee joined in 2002) - **Founders**: Not publicly available ## Core Business - **Primary industries**: Language Services, Localization, AI Training Data, Intellectual Property, Digital Marketing, Life Sciences - **Target customers**: B2B – enterprise localization teams, AI/ML labs, law firms and corporate legal departments, pharmaceutical and medical device companies, global marketing teams - **Mission or purpose**: To help organizations operate and scale globally by combining human expertise with advanced AI and technology, while fostering sustainability and inclusion. ## Products & Services For each major offering: - **Welocalize**: AI-enabled multilingual content and localization solutions for enterprises, powered by the Opal Platform (an agentic system orchestrating AI, automation, and human expertise). Serves localization teams in 300+ languages. - **Welo Data**: Multilingual data generation, evaluation, and human data infrastructure for AI systems. Provides a network of 500,000+ vetted experts and a proprietary quality framework (NIMO™). Supports foundation labs and enterprises deploying GenAI. - **Park IP**: Global IP solutions for law firms and corporate legal departments, including patent translation, foreign filing, and litigation support. Uses the Legal Studio platform for portfolio management. - **Welo Life Sciences**: Specialized language solutions for highly regulated industries (clinical trials, pharmaceuticals, medical devices). Includes translation, linguistic validation, and regulatory content services. - **Adapt**: Multilingual digital performance marketing agency. Offers paid search, SEO, programmatic, paid social, and content marketing. Uses Adapt Studio, a translation platform built for marketers. ## Market Standing - **Valuation/Market Cap**: Not disclosed - **Key Metric**: Serves over 2,000 clients in 300+ languages; employs a network of 500,000+ linguists and domain experts - **Notable Investors/Partners**: Not publicly available (private company) - **Growth Signals**: - Holds 7 ISO certifications (including ISO 14001 for environmental management) - Voluntarily discloses carbon emissions (Scope 1, 2, 3) - Actively expanding AI training data and GenAI evaluation services - LinkedIn reports 35 employees (likely corporate HQ), while the careers page lists over 1,500 corporate jobs globally – indicating a much larger workforce ## Competitive Advantages - **Portfolio of specialized brands** – each brand targets a distinct, regulated vertical with deep expertise and fit-for-purpose technology. - **Massive global network** – 500,000+ vetted linguists and domain experts across 300+ languages. - **AI-first technology** – Proprietary platforms (Opal, NIMO, Adapt Studio, Legal Studio) that integrate generative AI, automation, and human judgment. - **Compliance and security** – 7 ISO certifications (including ISO 14001) and a strong focus on data security, ethical AI, and sustainability. - **Longevity and scale** – Established over 20 years with a track record of serving Fortune 500 and Am Law 100 clients. ## Strategic Focus - **AI training data and evaluation** – Growing its Welo Data brand to support foundation labs and enterprises deploying GenAI, with a focus on safety, bias mitigation, and cross-lingual reliability. - **Product-led innovation** – Enhancing the Opal Platform and other agentic systems to automate multilingual content workflows. - **Sustainability** – Maintaining ISO 14001 certification, voluntarily reporting carbon emissions, and expanding the Give Grant program for employee-selected charities. - **Global scalability** – Continuing to build a diverse, remote-friendly workforce across 8+ countries. ## Why Work Here - **Remote-first culture** – Many positions are work-from-home; the company emphasizes global teamwork and flexibility. - **Diversity and inclusion** – “Come as you are” motto; active Give Grant program for employee-funded donations; commitment to hiring a diverse workforce. - **Sustainability focus** – ISO 14001 certified, with voluntary carbon disclosure and environmental initiatives. - **Career growth** – Opportunities across 1,500+ corporate roles worldwide in localization, AI, technology, marketing, and legal services. - **Learning environment** – Continuous learning encouraged; access to cutting-edge AI and multilingual technologies. ## Sources 1. [weloglobal.com](https://www.weloglobal.com/company/) 2. [weloglobal.com](https://www.weloglobal.com/company/careers/) 3. [weloglobal.com](https://www.weloglobal.com/portfolio/) 4. [linkedin.com](https://www.linkedin.com/company/welo-global) 5. 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