--- title: 'Machine Learning Engineer - Scale Up - 2nd hand Marketplace at FledgeHQ' canonical: 'https://feeny.ai/job/machine-learning-engineer-scale-up-2nd-hand-marketplace-fledgehq-barcelona-0c5sx1avgm9r' type: 'job' last_seen: '2026-09-13' --- # Machine Learning Engineer - Scale Up - 2nd hand Marketplace at FledgeHQ - **Company:** FledgeHQ - **Location:** Barcelona, Spain - **Employment:** full-time - **Work type:** hybrid - **Posted:** 2026-01-29 - **Last confirmed live:** 2026-09-13 - **Apply:** https://jobs.gem.com/fledge/am9icG9zdDpm2GJ0D6DcyhiiMuut1PIO ## Job description Barcelona, Full-time, Hybrid Fledge We are a boutique search firm connecting exceptional Talent with the most innovative companies and products that positively impact our societies. We present a tailor-made solution between fine consulting and flexible Talent search process outsourcing: - Fractional Talent Acquisition Advisory - Recruitment operation tooling - On-demand Talent Search Company summary Our client is a high-growth European tech scale-up on a mission to redefine how the world consumes. They believe in a collaborative economy where smart technology makes sustainable, second-hand trade the global norm. Operating as a major cross-border marketplace in Spain, Italy, and Portugal, they manage a massive ecosystem with hundreds of millions of products. Their goal is to blend the trust of traditional classifieds with the seamless convenience of a modern marketplace. In this role, you will: - Iterate and maintain the ML Platform, identifying opportunities to improve speed, reliability, and maintainability. You will define the long-term vision and roadmap for MLOps. - Work hand-in-hand with Data Scientists to support their efforts, ensuring they have the tooling to develop, deploy, and monitor scalable models efficiently. - Define and promote engineering best practices (coding standards, testing, CI/CD) within the ML domain. - Partner with Data Engineering and DevOps to align ML development with company-wide infrastructure and data governance standards. - Investigate and integrate new frameworks and tools (e.g., for LLMs or real-time inference) to keep our stack modern and effective. For this job, you must: - Proven experience building and owning production-ready ML platforms and pipelines. You understand the full lifecycle from experimentation to monitoring. - Deep understanding of AWS components (SageMaker, Lambda, S3) and container orchestration with Kubernetes. - Strong software engineering background with proficiency in Python, Git, and CI/CD workflows. You write robust, testable code. - Experience with real-time ML architectures, leveraging tools like Kafka for low-latency ingestion and inference. - Hands-on experience with vector databases or semantic search infrastructure (e.g., OpenSearch, Vertex AI), including indexing and retrieval tuning. - Familiarity with the broader ML toolkit, such as orchestration/tracking tools (Flyte, MLFlow, Feast) and standard libraries (Pandas, Scikit-learn, TensorFlow/PyTorch). - Professional proficiency in English and Spanish, with the ability to explain complex technical concepts to diverse stakeholders. What Would Be A Plus 🚀 - Hands-on experience working with LLMs, RAG architectures, and libraries like LangChain or LlamaIndex. - Familiarity with Big Data technologies like Spark or Beam. - Experience with Data Engineering tools such as Airflow, dbt, or Datahub. - Experience with other cloud platforms like GCP or Azure in addition to AWS. How to Apply If you are excited about this opportunity and believe you are a great fit for the role, please send your resume and a note outlining your experience and what motivates you to join a European tech scale-up. 🌈 Diversity, Equity, Inclusion, and Belonging We are committed to enabling everyone to feel included and valued, and we trust our partners to do the same. We believe both the company and its culture are strongest when composed of diverse experiences and backgrounds. All qualified applicants will receive consideration for employment without regard to age, color, family, gender identity, marital status, national origin, physical or mental disability, sex (including pregnancy), sexual orientation, or any other characteristic protected by applicable laws. ℹ️ Important If you have a medical condition or an individual need for an adjustment to our process, and you believe this may affect your ability to be at your best, please let us know so we can discuss how we can best support you and make any necessary adjustments. In case of any doubts or questions, please contact - manuela@fledge.net ## About FledgeHQ ## Company Overview - **One-liner**: Fledge is a boutique talent acquisition and search firm that helps tech companies and startups hire niche technical talent in Europe and the US. - **Entity Type**: Private (bootstrapped, no disclosed funding rounds) - **Headquarters**: Paris, Île-de-France, France (with a second office in Austin, Texas, USA) - **Founded**: Year not publicly available - **Founders**: Founders not publicly listed ## Core Business - **Primary industry**: Talent acquisition / Recruitment services for the technology sector - **Target customers**: B2B – primarily early- to growth-stage startups and scale-ups in Europe and the US, with a focus on engineering, data, AI, and security roles. - **Mission/purpose**: “Making hiring, work for everyone” – providing human-centric, tailored talent solutions that put people first and help both companies and candidates thrive. ## Products & Services - **Tailored Talent Search (Retained & Contingent)**: Full-cycle sourcing and recruitment of senior technical and leadership roles, including Founding Engineers, Cybersecurity Researchers, and Product Engineers. - **Fractional Talent Acquisition Advisory**: Embedded recruitment consultants who work directly with hiring managers to accelerate operations. - **Recruitment Operation Tooling**: Support for implementing sustainable talent management processes and employer branding. - **On‑demand Talent Search** (“Plug and Play”): Rapid, flexible sourcing for specific technical roles without long-term commitment. - **Coaching & Legal Support**: Career coaching for candidates and assistance with contract negotiations, compensation, and promotion discussions. ## Market Standing - **Valuation/Market Cap**: Not disclosed - **Key Metric**: Annual revenue not publicly available; total funding rounds not applicable (bootstrapped) - **Notable Investors/Partners**: No disclosed investors; partners with innovative startups and progressive tech companies; clients include Photoroom, Glady, ING Belgium, Wordsmith AI, and others (based on alumni data). - **Growth Signals**: - LinkedIn followers: 1,448 (yearly growth +12.6%) - Website traffic: 2,085 monthly visits (yearly growth +60.4%) - Workforce distributed across France, Spain, Colombia, Belgium, and the US - Recent expansion into Mexico City (hiring Forward Deployed Engineer to serve Latin American talent pool) - Active hiring campaigns for multiple portfolio startups (security, growth, engineering roles) ## Competitive Advantages - **Niche specialization**: Deep focus on tech talent in Europe and the US, particularly in AI, cybersecurity, data, and engineering – areas where generalist agencies often lack expertise. - **Human‑centric approach**: Emphasis on coaching, legal support, and career progression for candidates differentiates from high‑volume RPO (Recruitment Process Outsourcing) firms. - **Boutique, tailored service**: Small team (6 people) allows close partnership with founders and hiring managers, offering fractional advisory and flexible engagement models. - **Data‑driven sourcing**: Use of analytics to identify root causes in hiring processes and improve employer branding. ## Strategic Focus - **Geographic expansion**: Actively building presence in Latin America (Mexico City) to complement European and US operations, targeting bilingual candidates. - **Deepening AI & security practice**: Increasing placement volume in AI, cybersecurity, and governance roles (reflected in recent job postings). - **Strengthening candidate‑side offerings**: Expanding coaching and legal support to attract top passive talent and build a strong talent community. ## Why Work Here - **Culture**: Described as “human‑centric” and talent‑first; the team is lean (6 people) with a collaborative, remote‑friendly ethos. - **Work policy**: Hybrid and remote options available – some roles are fully remote, others are hybrid in Paris; flexibility depends on the client company. - **Notable perks**: - Exposure to cutting‑edge startups in AI, cybersecurity, and growth - Opportunity to work with a distributed international team - Coaching and legal support also available to internal team members? (not explicitly stated, but the firm values career development) - Emphasis on “positive impact” and progressive hiring practices. - **Engineering culture**: For technical candidates placed through Fledge, the firm focuses on high‑impact roles (Founding Engineer, Forward Deployed Engineer) with strong mentorship and autonomy. ## Sources 1. [fledge.net](https://www.fledge.net/) 2. [linkedin.com/company/fledgehq](https://www.linkedin.com/company/fledgehq) 3. [fledge.net/candidates](https://www.fledge.net/candidates/) 4. [fledge.net/companies](https://www.fledge.net/companies/) 5. [fledge.net/contact](https://www.fledge.net/contact/) ## Other roles at FledgeHQ - [Director of Growth Marketing, Paris](https://feeny.ai/job/director-of-growth-marketing-paris-fledgehq-paris-fppammw3mdh7) — Paris, France - [Senior CyberSecurity Researcher, Paris](https://feeny.ai/job/senior-cybersecurity-researcher-paris-fledgehq-paris-z1vjkdsmmbex) — Paris, France - [Forward Deployed Engineer - Series A - HR Tech](https://feeny.ai/job/forward-deployed-engineer-series-a-hr-tech-fledgehq-mexico-city-xxmq4macfy7t) — Mexico City - [Founding Product Engineer - Early stage](https://feeny.ai/job/founding-product-engineer-early-stage-fledgehq-paris-02q9my4mj33b) — Paris, France - [Backend Engineer - 2nd hand Marketplace](https://feeny.ai/job/backend-engineer-2nd-hand-marketplace-fledgehq-barcelona-2bhmt3gnpzsa) — Barcelona, Spain - [Forward Deployed Engineer - Series A - HR Tech](https://feeny.ai/job/forward-deployed-engineer-series-a-hr-tech-fledgehq-barcelona-8vg4p6wj6gk2) — Barcelona, Spain - [Senior Product Designer - Scale Up - 2nd hand Marketplace](https://feeny.ai/job/senior-product-designer-scale-up-2nd-hand-marketplace-fledgehq-barcelona-rpy7q5vs68j4) — Barcelona, Spain - [Staff BackEnd Engineer - Series A - HR Tech](https://feeny.ai/job/staff-backend-engineer-series-a-hr-tech-fledgehq-barcelona-v7cvnqv4639t) — Barcelona, Spain - [Forward Deployed Engineer - Series B - AI Customer Agents](https://feeny.ai/job/forward-deployed-engineer-series-b-ai-customer-agents-fledgehq-paris-znf7m0g5w711) — Paris, France - [Lead Account Manager - EMEA - NY based startup](https://feeny.ai/job/lead-account-manager-emea-ny-based-startup-fledgehq-paris-gw0w4a67dwrp) — Paris, France