Principal Software Engineer - Engineering Applications

We are thrilled to announce that we have secured $60 million in Series B funding at a valuation of $685 million - discover more about this exciting news here! Please be aware: This position is based in London and will follow New York business hours for the first six months due to the project's timeline, after which it will revert to UK hours.About LawhiveAt Lawhive, we are on a mission to democratize legal services.The legal sector has long been hindered by outdated technology and processes, which is why we have reimagined the entire framework with our proprietary AI-driven operating system at its core.As a regulated law firm, Lawhive harnesses an AI-native platform designed to enhance legal expertise and transform the practice of law, resulting in extraordinary outcomes for our clients and legal professionals.Lawhive Labs is where this vision takes shape, blending top-tier engineering, design, AI, and legal talent from around the globe to forge the future of legal practice.We are proud to be backed by esteemed investors such as Google Ventures, Balderton Capital, and TQ Ventures, and in early 2026, we successfully completed our $60 million Series B funding round to support our international expansion and team growth.Headquartered in London, we proudly launched in the US in 2025…and this is just the beginning.Engineering at LawhiveOur engineering team comprises 40 talented engineers and researchers who architect, build, and maintain Lawhive’s platform, which is utilized daily by hundreds of legal professionals across the UK, US, and beyond.There are numerous challenges we aim to tackle, and many we have yet to discover! Over the next year, our focus will be on:Enhancing the user experience for AI interactions among lawyers. We are striving for more than just basic “chat” capabilities, seeking to establish a new paradigm for human/machine interaction.Incorporating modularity and country independence into the core of our platform. Following our recent expansion to the US, we are creating the world’s first global consumer law firm.Delivering full-stack AI-native legal services: we’re not just developing software; we’re an AI-powered legal service provider.

Join the Lovable Revolution:Are you a passionate full-stack engineer dedicated to driving growth? At Lovable, we’re on a mission to transform initial interactions into daily habits and foster a vibrant ecosystem that generates real revenue. You'll find yourself launching onboarding and activation flows one sprint, and the next, you'll be innovating distribution channels and monetization features, empowering creators to expand their user base and enhance retention. Your expertise in React and APIs is crucial, but above all, you prioritize user success and engagement.The Ideal Candidate:You possess a unique blend of coding prowess, strong aesthetic judgement, growth-focused instincts, and an unwavering passion for product development.Why Join Lovable?Lovable empowers individuals and teams, from freelancers to Fortune 100 companies, to create software in any programming language. Our platform has already attracted over 2 million users across more than 200 countries, helping them bring ideas to life quickly and efficiently. As part of our small yet talented team in Stockholm, you'll play a pivotal role in redefining the software development landscape. We value ownership, speed, and collaborative spirit, and we seek individuals who are driven, fast-paced, and eager to make a significant impact.

Are you a driven and ambitious professional eager to contribute to revolutionary projects? Join a dynamic team at a rapidly expanding startup, collaborate with industry pioneers, and significantly impact the AI-for-legal sector. Seize the opportunity to own a role in a startup that is creating solutions that people truly desire and has already gained substantial traction. This is your chance to be part of something extraordinary! About the RoleWe are seeking an intelligent and proactive individual with a software engineering background leaning towards frontend development to spearhead our product growth initiatives. You will work at the intersection of engineering, product development, and marketing, analyzing a comprehensive range of metrics such as product usage, engagement, user acquisition, and pipeline optimization.Your responsibilities will include:Product Usage Analysis: Leverage dashboards (Posthog, Grafana, Datadog, etc.) to analyze user behavior and patterns to inform our growth marketing strategies and enhance engagement with existing customers.Top-of-Funnel Optimization: Innovate and execute creative strategies to build our top-of-funnel pipeline, including embedding product features in SEO blog posts and tracking the performance of our paid advertising efforts.Usage Optimization: Create workflows to identify unengaged users and test strategies to boost engagement.Metric Strategy: Collaborate with us to define the key metrics for optimization.Revenue & Pipeline Optimization: Aid in streamlining each step of our sales pipeline, both pre- and post-sale. Who You’ll Work WithSanj (Chief Research Officer and Co-Founder): With a Master's in Physics from the University of Cambridge and a PhD in AI from UCL, Sanj has received accolades at leading AI conferences, worked with Huawei's R&D team, and gained recognition for his contributions to open-source LLM projects on GitHub. As employee #4 at Magic Carpet AI, he developed AI strategies for trading that utilized millions in capital before the company was acquired by Blockchain.com.

Join Mixcloud as a Senior Growth Engineer and be instrumental in driving our growth strategy through innovative engineering solutions. You will collaborate with cross-functional teams to design and implement scalable growth initiatives that enhance user acquisition and retention.

Join Our Visionary Team to Create the Premier Training Platform for RunnersAt Runna, we empower everyday runners to achieve their best by developing an exceptional app that offers top-tier training, coaching, and community support. Whether you're aiming to enhance your 5k performance or prepare for your inaugural marathon, we're here to guide you every step of the way.Our growth trajectory is remarkable! In November 2023, we successfully secured a $6.5M funding round led by JamJar, with contributions from Eka Ventures, Venrex, and Creator Ventures. In 2024, we were honored to be recognized by Apple as one of three global finalists for the iPhone App of the Year, showcasing the innovation and impact of our platform. The journey continued with our acquisition by Strava in 2025!Our aspirations are ambitious: we aim to be the leading global training platform for millions of runners worldwide. As we evolve with purpose, we seek passionate individuals who want to contribute to something meaningful and impactful. With Strava's recent acquisition propelling our mission forward, this is an extraordinary time to become a part of our journey. The Growth Team You’ll Be JoiningWe are on the lookout for a skilled, inquisitive, and experimentation-driven Senior Full Stack Engineer to join our Growth Engineering team. This team is responsible for critical aspects of the user journey at Runna, focusing on both web and app platforms to craft high-quality experiences that convert first-time visitors into dedicated subscribers. You will collaborate closely with product, design, and data teams, as well as our founders and CTO, to enhance how new users discover and engage with Runna.Your ResponsibilitiesDesign, develop, test, and deploy high-impact user journeys and subscription funnels aimed at transforming curious visitors into active, engaged subscribers.Create and execute experiments across both web and app (including onboarding processes, paywalls, and plan discovery experiences) to optimize conversion at every stage of the user journey.Work collaboratively with Product, Design, and Data teams to identify opportunities, establish clear success metrics, and make informed decisions based on experimental outcomes.Partner with other teams to ensure users enjoy a seamless and consistent experience as they navigate through various products and platforms.Implement and sustain the instrumentation, tracking, and tools necessary for understanding user behavior, quickly identifying issues, and accurately measuring impact.Take ownership of features and initiatives that drive user engagement and retention.

The Position: We are in search of motivated and passionate Graduate Software Engineers to join our dynamic Engineering team in London. The ideal candidates will collaborate within cross-functional teams alongside product managers and designers, working closely with various departments to produce quality code that addresses genuine challenges for both internal and external stakeholders. This role offers the opportunity to take ownership of the solutions your team develops, ensuring excellence in all released products while contributing to a high-performing international development team. If you’re eager to tackle real-world problems through coding and thrive in a results-oriented environment, this could be the perfect opportunity for you. Key Responsibilities: Craft Solutions: Identify and define optimal technical solutions to business challenges, contributing to an architectural vision aimed at establishing us as the world’s leading research platform. Deliver Functional Code: Engage with React for frontend development and Kotlin microservices with PostgreSQL for backend solutions, while also maintaining legacy services in Ruby on Rails. We continuously evaluate new technologies that might enhance our stack. Deploy and Improve: Release updates frequently to our users, utilizing CIrcleCI and Spinnaker for CI/CD processes and rapidly gather user feedback to inform subsequent iterations. Enhance Your Skills: Accelerate your learning through hands-on experience in building cutting-edge technology with seasoned professionals in a performance-driven setting. Engineers have access to our Learning and Development budget to quickly acquire specific technical skills. Monitor and Troubleshoot: Vigilantly oversee our services to identify errors proactively, diagnose root causes, and implement fixes efficiently. Your Profile: You are currently pursuing a degree in Computer Science or a related field. Technical Proficiency: Familiarity with Kotlin, Java, Python, or React is required. Demonstrated Achievements: You have a clear record of accomplishments in your studies or previous roles.

About EucalyptusOur mission is to make good health last a lifetime. With over 1 billion individuals globally living with obesity, we aim to tackle preventable chronic conditions and enhance long-term care.Eucalyptus is the driving force behind Juniper, one of the largest weight-management programs worldwide. We integrate GLP-1 medication with personalized nutrition, movement support, and clinician-led care from a diverse team of prescribers, nurses, health coaches, pharmacists, and dietitians. Our published clinical research indicates that our combined clinical and behavioral approach enables patients to achieve significantly greater weight loss during their treatment with Juniper, yielding results four times more effective.Our Growth Story:130% year-over-year revenue growth and a 90% reduction in cash burn, with over $100M raised from notable investors including BOND, NewView, Blackbird, and Airtree.Successfully supported over 350,000 patients facing obesity across our five markets.Received prestigious NICE endorsement to provide services to the NHS.Customized our offerings for thousands of patients in Germany and Japan.Drive Frontend Innovation and Shape Patient ExperiencesAt Eucalyptus, our goal is to simplify, secure, and enhance healthcare accessibility. Patients often encounter challenges navigating care, which is why our Growth squad is dedicated to creating impactful frontend web experiences that drive critical metrics such as retention, engagement, and conversions while enhancing the overall patient journey.Your contributions will be pivotal in experimenting with the frontend platform, designing and testing features that directly affect patient engagement with our services. This role presents an exciting opportunity to innovate and influence the future of healthcare delivery.

About AirwallexAirwallex is a pioneering unified payments and financial platform designed for global enterprises. With our exceptional blend of proprietary infrastructure and innovative software, we serve over 200,000 businesses globally, including industry leaders like Brex, Rippling, Navan, Qantas, and SHEIN. Our fully integrated solutions facilitate everything from business accounts and payments to spend management and treasury, as well as embedded finance on a global scale.Founded in Melbourne, we boast a diverse team of over 2,000 talented tech professionals across 26 offices worldwide. Valued at $8 billion and supported by top-tier investors such as T. Rowe Price, Visa, Mastercard, Robinhood Ventures, Sequoia, Salesforce Ventures, DST Global, and Lone Pine Capital, Airwallex is at the forefront of constructing the future global payments and financial platform. If you're eager to undertake the most ambitious work of your career, we invite you to join our team.

Join Runna as a Senior Software Engineer II, where you'll play a pivotal role in enhancing our software solutions. You will collaborate with cross-functional teams to design, develop, and implement robust applications that meet our customers' needs. Your expertise will help us push the boundaries of technology, ensuring our products remain at the forefront of the industry.

Why Join Faculty?Founded in 2014, Faculty believes that artificial intelligence (AI) is poised to be one of the most transformative technologies of our era. Over the years, we have collaborated with more than 350 global clients, helping them enhance their performance through human-centered AI solutions. Discover our impactful projects here.At Faculty, we prioritize genuine innovation over fleeting trends. We focus on developing and implementing responsible AI that truly makes a difference. Our clients range across various sectors, including government, finance, retail, energy, life sciences, and defense, and we possess an unmatched depth of technical, product, and delivery expertise.As our reputation grows, we continuously seek talented individuals who share our intellectual curiosity and are eager to leave a positive legacy through technology.AI is a groundbreaking technology; join us to explore its most powerful applications and help bring them to life.About the TeamWithin our Professional and Financial Services Business unit, we leverage over a decade of Applied AI experience to assist our clients in navigating a fast-evolving landscape. We create and integrate AI solutions that enhance efficiency, improve customer experience, and uncover commercial opportunities in uncertain markets. In a highly regulated industry, we see immense potential for meaningful innovation and are proud to set the standard for combining technical excellence with secure deployment.About the RoleAs a Lead Software Engineer, you will drive the technical direction and execution of complex, innovative AI projects. Acting as a technical authority, you will apply your expertise across various initiatives, from AI strategy formulation to client-side implementations, ensuring that architectural decisions are both robust and reliable. This role requires a blend of profound technical knowledge and strong leadership capabilities, emphasizing innovation, team development, and the creation of reusable solutions across the organization. If you are ready to oversee high-stakes projects and deliver impactful, innovative results, this is your opportunity to shape our future.What You'll Be DoingLeading the technical direction and delivery of sophisticated AI projects.Applying your technical expertise to various projects, ensuring sound architectural decisions.Driving innovation while fostering team growth and collaboration.Building reusable solutions that can be leveraged across the organization.

Join Our Team as a Staff Software EngineerAt Deliveroo, we are dedicated to revolutionizing the way people shop and dine. Our commitment to impact, innovation, and growth is at the core of everything we do. Our engineering teams are tasked with addressing intricate technical challenges within a global, three-sided marketplace, developing and scaling systems that cater to millions of customers, riders, and partners daily.From real-time logistics to robust infrastructure and marketplace optimization, we design, build, and operate the technology that fuels Deliveroo's expansive growth.We are seeking a Staff Software Engineer to become a key member of our London, UK - Hybrid (3 days in the office) team. In this pivotal role, you will help us craft technical solutions for essential business challenges and steer the technical direction for complex, high-scale systems.Discover our Engineering team — learn about our motivations, work culture, and what you can expect when you join us.

Join unlikelyAI as a Staff Software Engineer and be at the forefront of developing cutting-edge artificial intelligence solutions. In this pivotal role, you will collaborate with a talented team to design, implement, and optimize software systems that push the boundaries of technology.As a key member of our engineering team, you'll have the opportunity to influence the architecture of our products and mentor junior engineers. We are looking for innovative thinkers who thrive in a fast-paced environment and are passionate about building scalable and efficient software.

About the Role Samsara is hiring a Software Engineering Manager based in London (UK2) or remotely within the UK. This position leads a team of engineers focused on building software that helps businesses work smarter and more efficiently. What You Will Do Guide and support a team of engineers as they design, build, and deliver software products Shape product development by collaborating with cross-functional partners Encourage a team culture that values creativity, technical growth, and collaboration Work Location London, UK2 office Remote within the UK

Join Multiverse as a Senior Software Engineer specializing in Platform Engineering. In this pivotal role, you will leverage your expertise to design, build, and enhance our platform, ensuring it meets the highest standards of performance and reliability. Collaborate with cross-functional teams to deliver robust solutions that drive the success of our innovative programs.

Role overview Based in London, the Senior Software Engineering Manager for Quality Engineering at Sony Interactive Entertainment Global leads a talented group of engineers. The position centers on defining and executing the strategy for software quality and performance across projects. Main responsibilities Shape the strategic direction for the quality engineering team Mentor and guide engineers, supporting their professional development Establish and maintain effective software testing practices Encourage ongoing improvement within the team Collaborate with cross-functional partners to ensure quality standards are met throughout the software development lifecycle Collaboration and impact This leadership role bridges engineering and quality, making sure software products meet rigorous standards from initial planning through release. Regular interaction with teams across Sony Interactive Entertainment Global helps to maintain and raise quality expectations company-wide.

Join our innovative team at getscope as a Senior Software Engineer. In this pivotal role, you will design, develop, and implement cutting-edge software solutions that will drive our projects forward. Collaborate with cross-functional teams to translate business needs into technical requirements while ensuring high quality and performance of applications.

Join our innovative team at AECOM as a Senior Software Engineer, where you will play a critical role in designing and developing cutting-edge software solutions. You will collaborate with cross-functional teams to bring complex projects to fruition, ensuring high quality and performance standards are met.

About the Role Shawbrook Bank is looking for a Senior Software Engineer in London. This role focuses on building software that supports business growth and improves efficiency. Collaboration with other engineers and teams is central to the work. What You Will Do Develop and maintain high-quality software tailored to customer needs Work closely with colleagues to deliver solutions that support the bank’s goals Contribute technical expertise to projects and ongoing improvements

About the PositionWe are seeking a highly skilled and motivated Senior Software Engineer - Generalist to join our innovative team at Anza. This role is pivotal in enhancing our Agave client and the overarching Solana network, focusing on performance, reliability, and security.About UsAnza is a cutting-edge R&D lab focused on the Solana blockchain, dedicated to revolutionizing blockchain performance and scalability. With a team of seasoned executives and core engineers, we tackle the most pressing challenges in the Web3 space. We believe in the power of collaboration and transparency, building robust protocols that can support the crypto ecosystem's growth and security.Your ResponsibilitiesDevelop and optimize our technical infrastructure, particularly the Agave client within the Solana ecosystem.Design and implement testing frameworks to simulate adversarial attacks and proactively identify vulnerabilities.Analyze performance metrics to pinpoint and resolve bottlenecks.Collaborate with subject matter experts to understand and define performance requirements for code components.Benchmark new solutions to enhance system reliability and performance.Work alongside cross-functional teams to architect solutions focused on scalability, security, and optimal performance.Contribute to all stages of the software development lifecycle, ensuring seamless transitions through development, staging, and production.Document architecture and processes to promote standardization and knowledge sharing across teams.