Senior Backend Developer (Ruby on Rails)

As a Senior Backend Developer specializing in Ruby on Rails, you will play a pivotal role in architecting, developing, and validating server-side logic for web applications. Your expertise will be essential in crafting efficient, reusable, and robust Ruby code, while optimizing systems for peak performance and scalability. You will work collaboratively within cross-functional teams, integrating front-end components into our applications. Your responsibilities will also include conducting code reviews, mentoring junior developers, and converting business requirements into effective technical solutions.The ideal candidate will possess a Bachelor's or Master's degree in a related discipline, along with a minimum of eight years of hands-on experience in Ruby on Rails development. You should be well-versed in various software testing methodologies, demonstrate strong analytical skills, and have excellent proficiency in English.

Join Our Team as a Ruby on Rails Developer!Location: London (Proximity to Liverpool Street Station)We are on the lookout for a talented Mid to Senior Ruby Developer to drive growth in our innovative property technology firm.At our company, we serve as the leading information hub for the Real Estate sector, connecting professionals with vital company insights through our advanced digital platform.We are proudly backed by esteemed angel investors from the Real Estate field and are experiencing rapid growth:Over 17,000 members and 450+ companies contributing content on a global scale, utilized by industry professionals worldwide.What We’re SeekingWe require a Ruby Developer with a strong background in the following technologies:Proficiency in Ruby on Rails and/or Sinatra, API Integration with REST, Git, RabbitMQ, Microservices Development, CI/CD, PostgreSQL, Test-Driven Development, and AWS.What We OfferWe provide a competitive compensation package, tailored to your skills and experience as a Ruby on Rails Developer:·Attractive salary·Equity in the company·Pension plan·Flexible working hours·Regular team-building activities·A fun and dynamic workplace·Shorter working hours during summer months

Senior Ruby on Rails Developer - Contract Position - £550/DayKey Challenges:Join a rapidly growing company that is becoming a household name! Our primary challenge is achieving scalability, and we are seeking experienced Senior Ruby on Rails Contractors who can engage with the entire product development process and contribute to architectural decision-making. As a contractor, mentoring junior staff and demonstrating proficient coding skills in Ruby (and Rails) with a focus on Test-Driven Development (TDD) is essential.Desired Qualifications:Proven experience in scalability and architectural decision-making as a Senior Ruby on Rails Engineer.Interest in functional programming and familiarity with Kafka is highly desirable.Experience in DevOps practices along with strong stakeholder management skills is preferred.Compensation: The rate is £550 per day for an initial period of 3 months.If you are interested, please send your CV to Sam Wellalage for a confidential discussion.

Senior Ruby on Rails Developer (Contract)5iveTech Recruitment is seeking an accomplished Senior Ruby on Rails Developer to join a rapidly expanding tech company based in Central London.We are in search of a highly skilled Ruby on Rails Engineer proficient in Test-Driven Development (TDD) and Pair Programming, ready to thrive in a collaborative and innovative environment.If you are a Contract Senior Ruby on Rails Engineer who enjoys contributing to diverse projects in a solution-focused setting, we invite you to send your CV to Sam Wellalage at 5iveTech Recruitment.

Join our innovative team at Upbeat Ideas UK Ltd as a Senior Ruby Developer. We are looking for an experienced developer who is passionate about building high-quality applications using Ruby on Rails. You will play a crucial role in designing, developing, and maintaining scalable web applications that enhance user experience and drive business success.The ideal candidate will have a strong background in software development, a knack for problem-solving, and the ability to work collaboratively in a dynamic environment.

Join our vibrant and dynamic team at Billetto, where the principle of 'freedom with responsibility' drives our innovative work culture. Our tech team comprises a diverse group of passionate hackers, all dedicated to the startup ecosystem. We embrace the latest technologies and utilize tools that inspire us. If you're eager to dive into the startup world and gain hands-on experience while contributing to a fast-growing company, you've found the perfect opportunity.Your role will encompass a spectrum of backend responsibilities, including Ticketing, Reporting, and Social Event Discovery.We provide a competitive salary along with a range of benefits, all within our centrally located London office.

Join our dynamic team at bbc-maestro, a leading SME with a global clientele, as a Senior Full Stack Engineer. Your primary mission will be to enhance and maintain our core platforms while collaborating with a talented group to craft scalable software that truly resonates with our users.In this role, you will actively engage in building and maintaining our Ruby on Rails platform and React Native mobile app infrastructure. You will also play a pivotal role in shaping our technical direction, mentoring your teammates, and ensuring high-quality delivery.This position is ideal for individuals who thrive in environments that encourage autonomy, love tackling real-world user challenges, and wish to have a hand in guiding technical decisions while remaining immersed in coding.You will report directly to our Engineering Manager.

Join our innovative team at Upbeat Ideas UK Ltd as a Senior Ruby Developer. In this role, you will leverage your extensive experience in Ruby on Rails to design and develop scalable web applications that enhance our client's digital presence. You will collaborate with cross-functional teams, ensuring high-quality code through best practices and effective testing methodologies.We are looking for a creative problem-solver who thrives in a fast-paced environment and is passionate about technology and user experience.

Join our dynamic team as a Senior Software Engineer specializing in Backend development. In this role, you will collaborate within our autonomous agile teams to craft the services that drive the Blacklane platform. Your contributions will enhance our back-office systems and address integration challenges for our business partners.Our Tech Environment: Our technology stack includes Ruby, Go, TypeScript, and Java, all structured using Domain-Driven Design (DDD). These services are deployed on Kubernetes and communicate via domain events using SQS and Kafka. We utilize a variety of data storage solutions including PostgreSQL, MySQL, Elasticsearch, Redis, and DynamoDB. Our cloud infrastructure is primarily based on AWS, with provisioning managed through Terraform.YOUR CHALLENGE:Address unique challenges to customize our products for specific markets.Maintain high standards through thorough test coverage, documentation, code reviews, and knowledge sharing.Dedicate time to optimizing performance, usability, and maintainability of the systems you oversee.Focus on personal development by acquiring new skills and technologies.Collaborate with a motivated, open-minded team committed to enhancing travel experiences for our guests.ABOUT YOU:You are proactive, curious, and a collaborative team player.You have at least 5 years of experience with two or more programming languages.You are proficient in at least one of the following languages: Ruby or Go.You possess knowledge of the HTTP protocol and have experience with REST APIs.You write high-quality, maintainable code and are familiar with the challenges of distributed systems.You are eager to learn more about event-driven architecture and domain-driven design.You have experience with Docker and containerized environments; knowledge of Kubernetes and Terraform is an advantage.

Are you an experienced Laravel developer with a passion for crafting robust backend systems? If so, we would love to connect with you! Join the Trybe team as a Senior Backend Developer and play a pivotal role in our mission to deliver exceptional software solutions in the industry. About Trybe:Trybe is a forward-thinking startup dedicated to providing innovative cloud-based software to clients in the hotel, spa, and wellness sectors. Our goal is to transform both guest experiences and back-of-house operations. Founded in 2020, we are proud to partner with leading spa and leisure operators globally. We foster a high-performance, collaborative team culture, welcoming talented individuals who thrive in a dynamic startup environment as we continue to expand.Key Responsibilities:Develop and maintain the Trybe Laravel backend, which powers our entire platform.Create APIs for frontend engineers, facilitate integrations with partners, and manage data processing jobs.Write extensive tests using Pest to ensure top-quality code delivery.Collaborate closely with engineering and customer experience teams to implement innovative features that meet client needs.Contribute ideas throughout the product development cycle to enhance feature quality.Who We Are Looking For:A minimum of 5 years of commercial experience with Laravel.A strong passion for technology and problem-solving.Ability to write clean, maintainable, and thoroughly tested code.A self-motivated learner who thrives in a fast-paced environment.Excellent communication skills and a collaborative team player.Experience handling large datasets, as we process millions of bookings annually.Proficient in building efficient RESTful APIs.Bonus Skills:Familiarity with MongoDB and Eloquent.Experience using Elasticsearch for data aggregation and reporting.

Join Egis Group as a Senior Rail Planner and play a pivotal role in shaping the future of rail infrastructure. In this exciting position, you will be responsible for developing and implementing strategic planning initiatives that enhance rail services and improve operational efficiency. Your expertise will contribute to high-impact projects that make a tangible difference in transportation.

At Zaizi, we are on the lookout for a highly skilled Senior Backend Software Developer who possesses exceptional technical expertise and a genuine enthusiasm for enhancing user experience and outcomes. In this role, you will take ownership of your deliverables while also collaborating with a multidisciplinary team to foster innovation and share creative ideas.Our work environment is inclusive, modern, friendly, and democratic, where we value bright, positive-thinking individuals with a proactive mindset. If you thrive on challenges and aspire to excel in your field, you will find a perfect fit with our team!

Join Updraft: Transforming Financial Futures!At Updraft, an award-winning fintech company authorized by the FCA, we are on a mission to revolutionize how individuals perceive and manage their finances. Our innovative platform automates everyday financial decisions, making it easier for users to handle credit cards, overdrafts, and loans. Experience a comprehensive spending overview across all financial accounts with Open Banking technology. Access a complimentary credit report with personalized tips to enhance your credit score. Leverage AI-driven financial planning tailored to help users manage expenses, eliminate debts, and boost credit ratings. Utilize intelligent lending solutions designed to lower the cost of credit. With over 800,000 users and a remarkable reputation within the UK fintech landscape, Updraft has helped individuals convert approximately £500 million in high-cost credit card debt into more manageable options, paving the way for better financial health. Rated 4.8 on Trustpilot, 4.8 on the Play Store, and 4.4 on the iOS Store by our satisfied customers. Recognized as a participant in the Technation Future Fifty 2025, a prestigious program that supports innovative startups on their journey to IPO. Featured in the Sifted 100 UK startups list for two consecutive years (2024 and 2025). We are seeking talented professionals to join us in our next growth phase, offering a unique opportunity to make a measurable impact. Expect a hybrid work culture that fosters collaboration across functional teams, generous learning budgets, wellness benefits, and the freedom to innovate and directly influence our customers' financial journeys.Become part of our commitment to building a fairer credit system!

Join Palantir Technologies as a Senior Backend Software Engineer and contribute to our innovative application development team. You will design and implement robust backend systems that are scalable and efficient, working alongside talented engineers in a collaborative environment.

At Spotify, we are on a mission to revolutionize the way creators and listeners engage with long-form storytelling through our Audiobooks initiative. Our objective is to create a seamless ecosystem for audiobook content, facilitating smooth transfers from publishers to listeners. This includes building the robust systems necessary for content ingestion, processing, and efficient delivery across our rapidly expanding global catalog. We are seeking a talented Senior Backend Engineer to join a dynamic and impactful team within the Audiobooks Pipeline sector. This team's primary responsibility is to design and scale systems that handle the ingestion, processing, and transformation of audiobook and eBook content, metadata, and royalties, ensuring that listeners receive the right content with utmost efficiency and quality. While this role encompasses full-stack responsibilities, the emphasis will be on backend and data-centric development. We are looking for an individual who thrives in uncertain environments, is passionate about learning, and is excited to tackle complex challenges across the tech stack.

Join Our Team!At Plum, we are revolutionizing how people save and invest. Our mission is to empower individuals to grow their wealth for life, whether they are saving for their first home or enjoying retirement. Since our inception in 2016, over 2 million users across 10 European countries have saved more than £2 billion with our innovative automation and AI technology. We've been recognized with awards from esteemed organizations like Deloitte and Finder, reflecting our commitment to excellence.We are a passionate team of over 200 Plumsters working collaboratively across Europe, and we are eager to welcome more talented individuals to help us achieve our vision.Your RoleAs a Senior Backend Engineer at Plum, you will play a crucial role in shaping our technology and product offerings. We seek engineers who are not only technically adept but also understand the importance of delivering outstanding products to our customers.

TL;DRDeducta is a rapidly expanding startup catering to some of the globe's most prestigious enterprises. With strong funding, we are committed to addressing today's most significant business challenges.We are seeking a Senior Backend Engineer who will play a pivotal role in the design, development, and upkeep of our core systems.In this role, your key responsibilities will include:Creating and sustaining high-performance, low-latency APIs for enterprise-level data processing systems.Delivering exceptional code promptly. Location: London, UK. Our office is situated near London Bridge, and we prioritize in-person collaboration. Compensation: The total compensation for this position begins at £150,000. Visa Sponsorship: We are willing to sponsor a visa for the ideal candidate to join our team. What is Deducta?Deducta is a leading data intelligence platform for global corporations. We provide unparalleled clarity into mission-critical data for some of the world's largest and most intricate organizations, starting with spend data.We are at the forefront of significant business transformations. Our partners leverage Deducta to achieve impactful results at remarkable speeds.‍What is the Role?We process vast datasets containing essential enterprise information from diverse sources and formats, structuring it effectively. Our system utilizes cutting-edge LLMs to tackle this challenge with unmatched precision and at previously unimaginable scales.As a Senior Backend Engineer, you will be responsible for designing, developing, and maintaining the foundational architecture of our platform as it expands.Your contributions will include:Designing, constructing, and maintaining data ingestion and processing engines capable of supporting mission-critical operations for the largest firms globally.Developing and sustaining ultra-fast, high-volume, and well-documented APIs to facilitate these systems.Driving business growth through a blend of creativity and experimentation to enhance our product, alongside proactive problem-solving for our clients.Working closely with both technical and non-technical team members to comprehend our customers' challenges and create solutions that address them.Success in this role means:Leading development initiatives from concept to production.Consistently driving enhancements and new features. Who will be the right fit?We are in search of a technically outstanding engineer who excels in a role that offers autonomy and ownership.You might be a great fit if you possess…Strong experience in object-oriented programming within cloud environments (e.g. AWS, GCP, or Azure), with .NET experience considered a plus.Familiarity with SOLID principles, domain-driven design, and Clean Architecture methodologies.A passion for...

Senior PHP Backend Developer - £500 per day (12+ Months, Remote Work Available, Outside IR35)We are seeking an experienced PHP Developer to join our team, working on an innovative Greenfield backend REST API project tailored for the transport sector. Collaborating closely with a Senior API Engineer, you will be part of a smaller, established, and friendly agency dedicated to delivering a significant project for a prominent client in the transport industry.Work Location:Options available in London, Bristol, or Cornwall, with full flexibility for remote work.

Ruby DeveloperAbout UsAt New Route Recruitment Limited, we are dedicated to transforming the childcare landscape in London. Our mission is to provide families with easier and more affordable access to flexible and high-quality childcare solutions. With the backing of renowned investors, including prominent VCs who have supported successful companies like Wonderbly, Thread, and Appear, we are proud to have been awarded ‘Best Technology’ at the Business Women Awards in 2017 and are currently shortlisted for several prestigious awards, including Startups ‘Tech Business of the Year’.Role OverviewJoin our innovative team as we develop a marketplace that connects families with exceptional nannies. As a Ruby Developer, you will play a crucial role in designing and implementing technology that simplifies complex matching processes, ensuring that both families and nannies receive seamless solutions. Your contributions will also enhance our recruitment and training initiatives for nannies.Technical EnvironmentIn this position, you will primarily work with Ruby on the backend, utilizing frameworks and technologies such as Rails, PostgreSQL, and Redis. Our frontend development employs modern tools, including ES6 and Tachyons. You will engage with GitHub for pull requests and code reviews, ensuring that our CI/CD pipeline with CircleCI is well-maintained before deployment. Most of our deployments occur on Heroku, with some operations on AWS. We prioritize using the most suitable tools for our tasks and are open to adapting our tech stack as necessary.Product DevelopmentOur product is continuously evolving as we build impactful features that drive significant improvements. Instead of following a lengthy product roadmap, we adopt short development cycles to validate assumptions and make informed decisions quickly. We prefer using feature flags over staging environments, deploying code to production frequently to optimize value delivery. As part of our engineering team, you will collaborate closely with product and operations teams to identify and develop innovative solutions for business challenges, ensuring maximum value for our customers.Candidate ProfileWe welcome applications from Junior, Mid-Level, or Senior developers who thrive in dynamic, fast-paced engineering environments.Key Qualifications:Proven experience in web application developmentFamiliarity with relational databases and SQLA commitment to writing clean, well-structured, and thoroughly tested codeA willingness to engage in pair programming and participate in a collaborative code review culture

About UsAt Heidi, we are pioneering an AI Care Partner that assists healthcare professionals at every stage, from documentation to patient care delivery. Our mission is to enhance healthcare capacity while maintaining a deeply human touch. In just 18 months, we have reclaimed over 18 million hours for clinicians and facilitated more than 73 million patient visits. Currently, Heidi powers over two million patient interactions weekly across 116 countries in more than 110 languages.Founded by healthcare professionals, Heidi unites clinicians, engineers, designers, scientists, creatives, and mathematicians, all dedicated to enhancing the human connection central to healthcare. With nearly $100 million in funding, we are expanding our reach in the USA, UK, Canada, and Europe, collaborating with major health systems, including the NHS and Beth Israel Lahey Health, among others.We are agile in our approach, focused on what works, and poised to shape the future of healthcare. Are you ready to take on this challenge?Your RoleAs a Senior Backend Engineer, you will be instrumental in executing backend features, leveraging your deep technical understanding to meet user requirements. You will thrive in a hyper-growth startup environment, with substantial experience in building SaaS products.With a solid grasp of the challenges engineers face, you will prioritize key features and capabilities through effective design principles. Your ability to bridge technical specifics with business needs will enable you to transform high-level concepts into practical solutions.Embracing challenging scenarios, you will appreciate the dynamics of a flexible, flat-structured work environment and quickly navigate the complexities of developing AI healthcare products on an international scale. We believe that exceptional talent can emerge from diverse backgrounds; if you have a proven history of delivering technically demanding products and features, we want to hear from you.