Software Engineer II - Android

Kaluza develops technology to help energy companies respond to changing demands and speed up the move toward a more sustainable, electrified world. The Energy Intelligence Platform combines data, artificial intelligence, and real-time decision-making to support partners such as OVO, AGL, ENGIE, Volvo, and Volkswagen as they navigate the complexities of today’s energy systems. This Software Engineer II role is part of the Flex team in London, following a hybrid work arrangement. The position reports to a Software Engineering Manager. What you will do Design and build scalable features for the Flex platform, connecting energy retailers, grid operators, and consumers. Integrate new technologies, including electric vehicles, to support services like "Charge Anytime." Collaborate with data scientists and backend engineers to address optimization challenges central to the energy transition. Take responsibility for features from initial concept through ongoing improvement, focusing on reliability and maintainability. Write well-tested, high-quality code to support large-scale decarbonization of transport and home energy use. Help foster an engineering culture centered on human-focused design and continuous learning. Compensation Salary: £46,000 - £60,000 Location and work arrangement Location: London, England, United Kingdom (Hybrid) Visa sponsorship Visa sponsorship is not available for this role. Kaluza reviews sponsorship policies on a role-by-role basis. Candidates interested in future opportunities with sponsorship are encouraged to check the careers page for updates.

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.

Join our talented team to create the leading training platform for runners!At Runna, we empower everyday runners to excel by developing an exceptional app that offers world-class training, coaching, and a vibrant community for everyone—from improving 5k times to training for marathons.Our growth is remarkable! In November 2023, we 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 one of three global finalists for the iPhone App of the Year by Apple, showcasing our innovation and impact. By 2025, we became part of Strava, further accelerating our journey!Our vision is ambitious: to be the premier global training platform for millions of runners worldwide. As we grow with intention, we seek individuals eager to contribute to something meaningful that leaves a lasting legacy. With the backing of Strava, now is an exciting time to be a part of our journey. The Team You'll JoinWe are in search of innovative, creative, and positive collaborators to become part of our skilled cross-functional engineering team. You will be part of the Train Team, collaborating closely with our modeling teams to integrate essential features aligned with Runna's mission, such as adapting plans for holidays and B races, supporting cutting-edge training plans, and enhancing in-app experiences using our AI/ML tools.You will partner with our CTO and engineering leadership to help shape the future of Runna, receiving unwavering support throughout this thrilling journey. Our roadmap is packed with opportunities to champion new technologies, tackle significant challenges affecting millions of runners, and enhance our existing architecture to elevate our engineering team.Your ResponsibilitiesDesigning, developing, testing, and delivering innovative features across the full stack.Collaborating with the Product team to determine the best solutions for optimal customer experiences.Working with modeling/AI engineers to design the architecture that interfaces between the Runna training engine and the Runna app.Providing technical support to team members as needed.Mentoring and coaching engineers in your team, offering guidance and code reviews while avoiding bottlenecks.

Join Our Team as a Senior Software Engineer IIAt Runna, we are assembling a skilled team dedicated to creating the premier training platform for runners. Our innovative app empowers everyday runners to achieve their best, offering world-class training, coaching, and community support for everyone from 5k enthusiasts to marathon first-timers.We are experiencing rapid growth! In November 2023, we successfully completed a $6.5M funding round led by JamJar, with contributions from Eka Ventures, Venrex, and Creator Ventures. Our app was recognized as one of three global finalists for Apple's iPhone App of the Year in 2024, showcasing the groundbreaking impact of our work. In 2025, we proudly joined the Strava family!Our goal is ambitious: to be the leading training platform for millions of runners worldwide. With our recent acquisition by Strava amplifying our mission, now is an exciting time to become part of something truly meaningful. Your Future TeamWe seek talented, innovative, and collaborative individuals to join our cross-functional engineering team. You will be an integral member of our newly formed Strength Team, collaborating with our modeling engineers and Team Strava to revolutionize strength training for athletes.You will work closely with our CTO and engineering leadership to shape the future of Runna, receiving support throughout this exhilarating journey. With a dynamic roadmap filled with opportunities, you will champion new technologies, solve meaningful challenges for millions of athletes, and enhance our existing architecture to elevate our engineering efforts.Your ResponsibilitiesArchitect, develop, test, and deploy new features across the full technology stack.Collaborate with the Product team to identify optimal solutions for an exceptional user experience.Partner with modeling and AI engineers to design the architecture that connects the Runna training engine with the Runna app.Provide technical assistance and mentorship to team members as needed.Guide and support fellow engineers through mentorship and code reviews, ensuring smooth workflows without bottlenecks.Contribute to operational efficiency by building and maintaining our development infrastructure.

Role overview Axon Enterprise, Inc. is seeking a Senior Software Engineer II to join its London office. This position centers on developing software that directly supports public safety and serves communities. Engineers at Axon play a key part in building solutions designed to grow and adapt alongside evolving needs. Key responsibilities Collaborate with engineers from diverse backgrounds to design and build software products Develop and enhance systems that assist public safety professionals in their daily responsibilities Share ideas and contribute code in a setting that values technical input and encourages new perspectives Work environment The engineering group values both initiative and teamwork. Creativity and practical problem-solving are woven into daily routines, and the team moves quickly to deliver results that matter.

Role overview The Trade Desk is hiring a Software Engineer II focused on Buying in London. This role centers on building and improving software that helps clients make smart advertising choices. The position works closely with teams from different disciplines to design, develop, and refine solutions for digital advertising. What you will do Partner with cross-functional colleagues to create and enhance software for advertising buying workflows Design and implement features that support client decision-making in digital advertising Contribute technical knowledge and fresh ideas to ongoing projects

Kaluza is hiring a Software Engineer II to help advance its Energy Intelligence Platform. This hybrid role can be based in London, Bristol, or Edinburgh. The team focuses on building scalable SaaS solutions for energy retailers, supporting the shift to cleaner, electrified systems. The salary range for this position is £46,000 to £60,000. Please note that visa sponsorship is not available at this time. Role overview This position reports to a Software Engineering Manager. The specific team and responsibilities will be shaped during the interview process, matching your experience to areas where you can make the most impact. The Talent Acquisition team will provide guidance throughout the process. What you will do Contribute to the Energy Retail platform, a SaaS product designed for energy retailers and decarbonization initiatives. Develop and enhance backend services with TypeScript and Node.js, focusing on reliable, event-driven systems at scale. Work closely with product managers, designers, and engineers to deliver features that address user needs. Take responsibility for specific services or components, supported by experienced colleagues. Write well-tested code, interact with databases, and use cloud technologies such as AWS. Help maintain stable production systems and participate in a culture of continuous improvement. About Kaluza Kaluza’s platform uses data, AI, and real-time decision-making to help energy companies manage complexity and deliver practical solutions. The company partners with organizations like OVO, AGL, ENGIE, Volvo, and Volkswagen, and operates globally, including a joint venture with Mitsubishi Corporation in Japan. Kaluza’s mission is to make clean energy reliable and affordable through predictive algorithms and human-centered design.

Important Note: This is a pivotal Intermediate role within our team, edging towards Senior level. We are eager to connect with Product Engineers who possess substantial commercial experience in TypeScript and React. If you align with this description, we would love to hear from you! Location: London (E1) Hybrid Work Model: 2 days a week in the office, with the option to work remotely for the remaining 3 days (or in-office if you prefer).Our Mission:Two in five individuals in the UK rent their homes. Goodlord aims to deliver the premier renting experience globally.Founded with the goal of simplifying and clarifying the renting process for agents, landlords, and tenants alike, Goodlord recognizes the increasing digital expectations of Generation Rent and is committed to meeting these needs.Our journey has had its challenges, but we now stand stronger than ever, with approximately 3,000 letting agents utilizing our platform, an array of exciting products, and a dedicated team of over 350 Goodlordians supporting our mission!The Opportunity:Collaborate with product managers, designers, business colleagues, and fellow engineers to identify and understand end-user challenges.Propose comprehensive solutions to address these challenges.Support your squad in delivering features effectively.Utilize your expertise in React and TypeScript to continuously identify improvement opportunities and suggest enhancements.Conduct code reviews for your peers.Provide mentorship to junior developers.What We Require:Considerable commercial experience in developing web applications using TypeScript and React.Ability to propose complete solutions to technical problems.Strong understanding of state management and creating reusable and testable components and pages, along with familiarity with architectural patterns such as DDD and microservices.Proficient in writing automated tests utilizing frameworks like Jest, React Testing Library, or Cypress.In-depth knowledge of web application security measures and common vulnerabilities.

Join Our Team as an Automation Software Test Engineer - £400 per day (6+ Months / Remote Work Available / Outside IR35)We are looking for a talented Automation Software Test Engineer to join our dynamic team working on an exciting greenfield project. In this role, you will collaborate closely with a small team of developers and UX designers in a friendly, non-corporate agency environment. Our flat organizational structure values contributions over titles, allowing for an innovative and flexible work atmosphere.Location·Option to work from London, Bristol, or Cornwall.·Full remote work flexibility.

Role Overview Wise is looking for a Senior Software Engineer II focused on Investments to help design and build Java applications. This position is based in London and centers on projects that support and improve Wise's investment strategies. What You Will Do Develop and maintain Java-based applications for the Investments team Work closely with engineers and stakeholders to deliver features and improvements Contribute to projects that directly impact Wise's investment products and processes Collaboration This role works within a collaborative team, sharing ideas and solutions to solve complex problems and deliver reliable software.

Role overview Wise is looking for a Senior Software Engineer II to develop enterprise solutions tailored for banks. The main focus is on building dependable software that supports banks in serving their customers better. This position involves close collaboration with colleagues from various teams. The shared aim is to deliver solutions that enhance the efficiency and effectiveness of banking operations. What you will do Design and build reliable software for enterprise banking clients Work with cross-functional teams to deliver improvements Contribute to projects that streamline banking services Location This role is based in London.

Role overview Wise seeks a Senior Software Engineer II in London to build software solutions for enterprise banking clients. The focus is on creating applications that serve banks and financial institutions, working alongside a skilled engineering team. What you will do Design and develop scalable software for enterprise clients in the banking industry. Collaborate with engineers and other teams to define, build, and launch new features. Maintain strong standards for code quality and application performance. Contribute to initiatives that enhance the experience for banks and their customers. Collaboration This role involves frequent work with cross-functional teams to deliver features and improvements. Sharing ideas, reviewing code, and helping set technical direction are all part of the job, especially for projects aimed at enterprise banking needs.

Join Elastic, the leading Search AI Company, as a Principal Software Engineer II focused on Search Internals for Lucene and Elasticsearch. In this pivotal role, you will leverage your extensive expertise to drive the evolution of our core search capabilities, ensuring we deliver an unparalleled search experience. Collaborate within a globally-distributed team of seasoned engineers to enhance our search infrastructure, including indexing and retrieval. You will define the technical vision and roadmap for Elasticsearch, working closely with product teams to shape innovative solutions that meet user needs. Your insights will continuously improve the search experience, making you a key authority in the field.

Role Overview 8th Light, Inc. is seeking a Senior Software Engineer to join its London-based team. This hybrid role offers the chance to work alongside experienced engineers on a variety of client projects. The company is a well-established software consultancy, known for its focus on quality and collaboration. What You Will Do Design, develop, and maintain software applications for a range of clients and industries Work closely with other engineers to deliver reliable, well-crafted solutions Mentor junior engineers, sharing knowledge and supporting their professional growth Contribute to a team culture that values learning and continuous improvement Location This position is based in London, England, with a hybrid work arrangement.

The Trade Desk is a leading global technology firm dedicated to enhancing the internet for all through principled and intelligent advertising. With the capability to process over 1 trillion queries daily, our platform operates at an unmatched scale. We pride ourselves on cultivating a robust, award-winning culture grounded in trust, ownership, empathy, and collaboration. We celebrate the unique experiences and viewpoints that each individual contributes to The Trade Desk and are committed to creating inclusive environments where everyone can express their authentic selves.Are you passionate about tackling complex challenges on a large scale? Do you want to join a vibrant, globally-connected team where your work will significantly impact the development of a better media ecosystem? Join us and discover why Fortune magazine consistently ranks The Trade Desk among the best small to medium-sized workplaces worldwide.

Job Title: Senior Software Engineer I Location: London - Hybrid Salary: £60,000 - £80,000 Team: Flex Reporting to: Software Engineering Manager Note: Currently, we are unable to provide visa sponsorship for this position. We are dedicated to fostering a diverse, global team and evaluate our sponsorship policy on a role-by-role basis. Please monitor our careers site for future opportunities that may offer visa sponsorship. Kaluza is at the forefront of transforming energy complexities into seamless solutions through our Energy Intelligence Platform. We empower energy companies to navigate modern challenges while expediting the transition to a clean, electrified future. Utilizing cutting-edge Data, AI, and real-time decision-making, we convert energy intricacies into growth opportunities for our partners. By merging predictive algorithms with human-centered design, Kaluza ensures that clean energy is both reliable and affordable. Our teams span across Europe, North America, Asia, and Australia, and we maintain a joint venture with Mitsubishi Corporation in Japan. We collaborate with industry leaders such as OVO, AGL, and ENGIE, alongside innovators like Volvo and Volkswagen. Key Responsibilities: As a member of the Flex platform team, you will play a critical role in developing systems that connect energy retailers, grid operators, and consumers, fostering a more adaptable and dynamic energy infrastructure. Your daily tasks will involve designing and implementing scalable features, including integrating technologies like electric vehicles and facilitating customer offerings such as “Charge Anytime.” You will collaborate closely with data scientists and backend engineers on fundamental optimization challenges, taking ownership of features from conception through continuous enhancement. Throughout this process, you will produce high-quality, well-tested code and contribute to a robust engineering culture, developing software that significantly contributes to decarbonizing transport and home energy usage at scale. Qualifications: Proficiency in at least one programming language and experience contributing to diverse, complex systems. Strong understanding of contemporary engineering practices, encompassing continuous delivery, test automation, and agile methodologies. A fervor for collaborating within cross-functional teams to tackle challenging problems and build innovative features.

Join our dynamic team at Wise as a Senior Software Engineer II specializing in Treasury and Liquidity solutions. In this role, you will leverage your expertise in Java to develop innovative software that enhances our financial services. Collaborate with cross-functional teams to deliver high-quality projects that directly impact our global operations and customer experience.

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 the Contacts Team Role Wise is looking for a Senior Software Engineer II to join the Contacts Team in London. This position focuses on building and improving Java-based applications that support the company’s core products. What You Will Do Work closely with engineers, product managers, and other stakeholders to design and implement software solutions. Develop and maintain high-performance Java applications that respond efficiently to front-end requests. Promote best practices in code quality, testing, and agile development within the team. Who We’re Looking For Significant experience with Java in a production environment. Comfort working with cross-functional teams. Strong interest in building reliable, scalable systems.