Staff Software Engineer – Agentic AI

The Trade DeskLondon

On-site Full-time

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Experience Level

Experience

Qualifications

Proven experience in software development, particularly in AI applications. Strong proficiency in programming languages such as Python, Java, or C++. Experience with machine learning frameworks and tools. Excellent problem-solving skills and a proactive approach to challenges. Ability to work collaboratively in a fast-paced environment. Strong communication skills, both verbal and written.

About the job

The Trade Desk is hiring a Staff Software Engineer to help build advanced AI solutions. This London-based role centers on designing and implementing software systems that support and improve AI-driven products.

What You Will Do

Design and implement software systems for AI applications
Work closely with teams across disciplines to expand product capabilities
Support integration of new technologies into existing products

Collaboration

This role involves frequent collaboration with cross-functional teams to ensure AI systems are effective and integrate smoothly with other offerings.

About The Trade Desk

The Trade Desk is a global technology company that empowers buyers of advertising through an innovative platform. We are committed to creating a more transparent and efficient advertising ecosystem, leveraging technology to provide our clients with powerful insights and tools to achieve their marketing goals.

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Staff Software Engineer - AI Product

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Staff Software Engineer – Agentic AI

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Staff Software Engineer - Hardware Integration at OLIX | London

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Software Engineer - Member of Technical Staff at Aptura | London

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Full-time|On-site|London, England, United Kingdom

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Lead AI Software Engineer at Tracer | London

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Full-time|On-site|London

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Staff Software Engineer at Ripple | London

Ripple Labs Inc.

Full-time|On-site|London, UK

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Staff Software Engineer - Enabling Teams at Ebury | London

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Full-time|Hybrid|London

Ebury is on a mission to empower ambitious businesses to achieve global growth. We extend the same philosophy to our team members, promoting innovation, collaboration, and problem-solving in an inclusive environment where everyone feels valued, supported, and empowered to thrive.If you are a collaborative individual eager to revolutionize global business operations, we encourage you to reach out. Join us at Ebury and accelerate your career while shaping the future of finance.Join Our Team as a Staff Software Engineer (Enabling Teams)Location: London Office - Hybrid: 4 days in the office, 1 day remoteEbury is seeking highly skilled and motivated Staff Software Engineers to enhance our engineering division in London. This is a remarkable opportunity to make a significant impact within a leading FinTech firm. As a Staff Software Engineer, you will be a crucial member of our team from day one, contributing to mission-critical projects and deploying production code within your first week. Your role will involve collaboration with various product squads alongside Engineers, Product Designers, and Product Managers. We expect you to tackle complex challenges and guide your team to make informed trade-offs. You will be immersed in both the intricate details and the overarching vision of our projects. Additionally, you'll play a pivotal role in engineering leadership and cultivate strong relationships with stakeholders across the organization. We are committed to identifying and nurturing future technical leaders; for those who exhibit exceptional performance and potential, we offer an accelerated career progression path.

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Software Engineer - AI Solutions in London

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Full-time|On-site|London

About Flow EngineeringFlow Engineering is at the forefront of innovation, providing an AI-native requirements platform tailored for forward-thinking engineering organizations. Our mission is to empower hardware teams to seamlessly collaborate with AI agents, optimizing the design, validation, and evolution of intricate systems with unmatched efficiency and precision.Role OverviewWe are on the lookout for talented Software Engineers to engineer AI-driven features that enhance the way teams create, review, and oversee requirements. You will be instrumental in developing workflows for agentic systems and domain engineers, placing AI at the core of systems reasoning.This position merges the realms of AI, product management, and full-stack engineering, allowing you to transform concepts from initial prototypes into robust, observable features deployed in production.Your ResponsibilitiesDesign and implement AI-enhanced features, including assisted requirement drafting, consistency checks, impact analysis, and intelligent suggestions tailored for systems and domain engineers.Develop agentic workflows that enable systems and domain engineers to explore designs, simulate alterations, and validate requirements effectively.Evaluate and integrate advanced language models and related tools, focusing on reliability, latency, cost-effectiveness, and debuggability in live environments.Build and maintain essential infrastructure, including data pipelines, evaluation frameworks, and observability measures with appropriate safety protocols.Engage across the technology stack, from backend APIs to user interface integrations, ensuring the delivery of comprehensive AI solutions rather than isolated model endpoints.Collaborate with product teams and clients to pinpoint high-impact workflows, conduct experiments, and iterate swiftly based on user feedback.Your ProfileMinimum 3 years of experience in software development, with a strong focus on designing, testing, and operating scalable services within cloud environments.Hands-on experience with leading language model providers and technologies (e.g., OpenAI, Anthropic, Hugging Face, vector databases, retrieval-augmented generation patterns).Familiarity with prompt engineering, retrieval-augmented systems, evaluation techniques, and safety/guardrail methods.Proficient in evaluating trade-offs among various models, architectures, and deployment strategies, making informed decisions.Thrives in a dynamic, ownership-driven environment where experimentation and rapid iteration are commonplace.

May 1, 2026

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Software Engineer - Member of Technical Staff

mentis

Full-time|On-site|London

About MentisAt Mentis, we are dedicated to creating reliable AI solutions for critical sectors such as finance, healthcare, and legal. Our team specializes in developing meticulously curated evaluation datasets and reinforcement learning environments. We empower AI labs and startups by providing them with expertly crafted training data, calibrated assessment rubrics, and rigorous task environments to push the boundaries of AI capabilities in regulated industries.As a tight-knit team based in London, we pride ourselves on our agility and commitment to excellence. Every member plays a vital role in our mission, and we value initiative and ownership in our collaborative work culture. If you are passionate about shaping the future of frontier AI applications, we want to hear from you.About the RoleAs a Software Engineer and Member of Technical Staff, you will be instrumental in building and scaling the platform that drives Mentis' operations. You will develop essential annotation tools, workflow systems, quality control pipelines, and internal infrastructure fundamental to every dataset and environment we deliver.Your daily tasks will include designing expert task creation workflows, creating task assignment and review interfaces, developing data pipelines to convert expert outputs into structured training sets, and integrating LLM-powered tools into our product. Your role will vary from product engineering to infrastructure development, with a consistent focus on producing high-quality evaluation data at scale.You will take ownership of the platform's development, making key decisions on what features to build, how to implement them, and establishing the standards for our growth.What You'll DoDevelop and manage the core data annotation and workflow platform from start to finish, overseeing task assignment, expert interfaces, quality control, and dataset delivery.Design systems that facilitate expert onboarding, task routing, review workflows, and scalable quality assurance processes.Enhance AI-integrated pipelines across the platform, including LLM-assisted annotation, automated checks, and model-in-the-loop workflows.Collaborate directly with founders and domain experts to streamline bespoke processes into effective, scalable software solutions.Make informed product and engineering decisions in a dynamic environment, prioritizing and shipping features without waiting for perfect specifications.Contribute to defining our team’s development practices, including tooling choices, engineering standards, and product strategy.Who We're Looking ForWe seek a proactive individual who thrives in fast-paced environments and embraces ambiguity. If you are excited about the opportunity to influence how AI learns and operates in real-world settings, we welcome your application.

Mar 31, 2026

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Senior Staff Software Engineer at Fleek | London

Fleek

Full-time|On-site|London

Join Us in Revolutionizing the Fashion Supply Chain!Each year, the fashion industry generates over 100 billion garments, with a staggering 60% ending up in landfills. This waste isn't due to lack of demand; rather, the secondhand fashion supply chain is outdated, manual, and inefficient.At Fleek, we are dedicated to transforming this reality. Our goal is to establish secondhand fashion as the preferred choice for consumers. We are developing an innovative infrastructure that empowers the global secondhand clothing market through a B2B marketplace and AI-driven systems that streamline the supply chain.Fleek enables vintage boutiques, online resellers, and retail buyers to access high-quality graded secondhand inventory directly from wholesalers and rag houses worldwide. Central to our operations is FleekSort, an advanced AI model specifically trained on secondhand fashion, capable of grading, pricing, and categorizing items using just a photo. This technology transforms what has traditionally been a fragmented and manual trade into a cohesive, searchable, and tradable global inventory system.Since our inception in 2022, we have successfully diverted 9 million items from landfills and have experienced consistent year-on-year growth. With approximately $50 million raised from distinguished investors including a16z, Y Combinator, Burda Principal Investments, and HV Capital, we have recently completed our Series B funding round. Our advisors and private investors include industry veterans from Depop, Shopify, and Postmates.Currently, we serve thousands of resellers and retailers across the UK, Europe, and the US. With the secondhand fashion market projected to soar to $350 billion by 2027, Fleek is poised to become the AI-driven operational and financial backbone of secondhand commerce on a global scale.We are in search of passionate individuals eager to build impactful solutions and thrive in a fast-paced environment. If this excites you, continue reading!About This RoleAs the most senior engineering position within our organization, you will oversee the Demand product, which is crucial for driving revenue, growth, and customer engagement across mobile, web, and backend platforms. You will lead a talented team of approximately five engineers based in London, report directly to our CTO, Sanket Agarwal (formerly of Google and Postmates), and collaborate closely with our Product and Design teams.You will be responsible for everything that affects buyer conversion, retention, and growth speed.Why This Role Is UniqueAt Fleek, the Demand function is our most commercially vital area. You will not merely offer advice as a Staff engineer; you will have ownership over the entire system that transforms supply into revenue.Fleek is at the forefront of digitizing an industry that has yet to embrace technology. There are no established guidelines for creating a transaction layer around secondhand fashion at a wholesale scale, where each item is distinct...

Feb 17, 2026

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