You need fluency in Java, experience with testing frameworks like JUnit, knowledge of Spring Framework, Git, and CI/CD setups. Experience in contributing to projects, communication skills, and a willingness to learn new technologies are essential. Knowledge of scripting languages is a plus.

You will design and build Java JUnit tests, manually test product components, participate in code reviews and pair programming, refine user stories, and focus on delivering incremental value in an Agile environment. Passion for innovation and customer outcomes essential.

Software Engineering

United Kingdom

Oxford

Scaleup

AI for code: Diffblue's first product, Cover, automatically writes regression unit tests for your code allowing you to ship higher quality software, faster.

Technology

Diffblue

We make software that writes software. Our first product, Cover, automatically writes unit regression tests for code.

About DiffblueDiffblue is changing the way software is developed. We build products that have the potential to improve the experience of every software developer in the world. By using Artificial Intelligence to write unit tests, we are helping teams do more and better testing, sooner in the DevOps pipeline. Diffblue spun out of the University of Oxford in 2016 and received the largest AI Series A funding in Europe in 2017. Having just closed our latest round of funding and coming off the back of triple digit growth, we are building out our go-to-market sales &amp; marketing teams. We’re backed by the University, our customers and leading venture capital funds.Our product Diffblue Cover automatically writes unit tests for Java applications using AI, mimicking human-written tests but working 250 times faster than a human – and it never gets bored or makes a mistake. Each time Diffblue Cover runs it creates a new baseline ensuring tests are always up to date without the need for developers to maintain them manually.We promote an environment in which we support and learn from each other. We strongly believe that diversity is important for a modern business, and that when different opinions, backgrounds and life views meet, better results are obtained.Job purposeWe are seeking a Junior SDET who deeply understands the technology and principles that underpin modern Java applications and has a passion for delivering high quality products that add value to customers in a fast-paced, rapidly changing environment. You will be expected to readily empathise with customers using environments such as the Spring Framework as well as understanding the internals of how these systems are put together. You will also have a passion for testing and best-practice software delivery as testing is our core business. We are passionate about test automation and you would be expected to bring your skills in test automation and quality assurance to improve the speed at which we can deliver without compromising the overall quality of our products.Key Responsibilities<ul><li>Design and build complex Core Java JUnit tests in an Agile environment, using industry QA best practices</li><li>Manually test those parts of our product that do not yet have test automation and rapidly evolve our testing corpus and infrastructure to cover them in time</li><li>Participate in code reviews, pull-request development, pair programming and test development</li><li>Pro-actively contribute to the team’s objectives of delivering incremental value every sprint and partner with other team members to deliver those objectives</li><li>Interact with business stakeholders, customers and management to understand and refine user stories and the product backlog</li><li>Have a passion for innovation and improvement whilst recognising that customer outcomes are always key</li></ul>Requirements&nbsp;We are looking for people who have:<ul><li>Studied a computer science related subject at an undergraduate degree level or higher</li><li>Fluency in the Java language and runtime library</li><li>Fluency with JUnit, hamcrest and other Java testing frameworks</li><li>Good understanding of the Spring Framework and the core concepts of Spring testing</li><li>Knowledge of Git or other SCMs</li><li>Contributions to large private and/or open-source projects</li><li>Knowledge of test-driven development and a CI/CD setup</li><li>Excellent communication skills and ability to work well in a team proactively&nbsp;</li><li>Experience with one or more of Linux/Mac OS/Windows environments</li><li>Willingness to learn new skills and technologies and adapt to arising challenges</li></ul>Desirable:<ul><li>Knowledge of scripting languages like Python</li></ul>We are passionate about developing people and this role also offers the opportunity to graduate into the core engineering team should sufficient progress be made in a suitable time frame.BenefitsYou’ll get to work in one of the hottest tech startups in the world of deep tech AI for code, applying state-of-the-art program analysis and synthesis technology to tough problems faced by development teams at the world’s leading companies. At Diffblue we offer flexible working with regular opportunities to collaborate and meet the team in person in Oxford.Company benefits include:<ul><li>Competitive package, including share options</li><li>Private health and dental plans (including 24/7 virtual GP service, additional cancer care and mental health cover)</li><li>8% non-contributory pension</li><li>Life insurance &amp; Income Protection schemes (including additional medical, wellbeing support)</li><li>25 days annual leave + Bank holidays + Christmas shutdown</li><li>Enhanced family-friendly benefits</li><li>Flexible working</li><li>Annual eye tests and £50 contributions towards glasses</li><li>Cycle to work scheme</li></ul>While we expect the future of work to continue to be a hybrid model working both remotely and in-office, we do have a great environment in our Oxford-based head office with beautiful open-plan space with lots of natural light.

About DiffblueDiffblue is changing the way software is developed. We build products that have the potential to improve the experience of every software developer in the world. By using Artificial Intelligence to write unit tests, we are helping teams do more and better testing, sooner in the DevOps pipeline. Diffblue spun out of the University of Oxford in 2016 and received the largest AI Series A funding in Europe in 2017. Having just closed our latest round of funding and coming off the back of triple digit growth, we are building out our go-to-market sales & marketing teams. We’re backed by the University, our customers and leading venture capital funds.Our product Diffblue Cover automatically writes unit tests for Java applications using AI, mimicking human-written tests but working 250 times faster than a human – and it never gets bored or makes a mistake. Each time Diffblue Cover runs it creates a new baseline ensuring tests are always up to date without the need for developers to maintain them manually.We promote an environment in which we support and learn from each other. We strongly believe that diversity is important for a modern business, and that when different opinions, backgrounds and life views meet, better results are obtained.Job purposeWe are seeking a Junior SDET who deeply understands the technology and principles that underpin modern Java applications and has a passion for delivering high quality products that add value to customers in a fast-paced, rapidly changing environment. You will be expected to readily empathise with customers using environments such as the Spring Framework as well as understanding the internals of how these systems are put together. You will also have a passion for testing and best-practice software delivery as testing is our core business. We are passionate about test automation and you would be expected to bring your skills in test automation and quality assurance to improve the speed at which we can deliver without compromising the overall quality of our products.Key ResponsibilitiesDesign and build complex Core Java JUnit tests in an Agile environment, using industry QA best practicesManually test those parts of our product that do not yet have test automation and rapidly evolve our testing corpus and infrastructure to cover them in timeParticipate in code reviews, pull-request development, pair programming and test developmentPro-actively contribute to the team’s objectives of delivering incremental value every sprint and partner with other team members to deliver those objectivesInteract with business stakeholders, customers and management to understand and refine user stories and the product backlogHave a passion for innovation and improvement whilst recognising that customer outcomes are always keyRequirements We are looking for people who have:Studied a computer science related subject at an undergraduate degree level or higherFluency in the Java language and runtime libraryFluency with JUnit, hamcrest and other Java testing frameworksGood understanding of the Spring Framework and the core concepts of Spring testingKnowledge of Git or other SCMsContributions to large private and/or open-source projectsKnowledge of test-driven development and a CI/CD setupExcellent communication skills and ability to work well in a team proactively Experience with one or more of Linux/Mac OS/Windows environmentsWillingness to learn new skills and technologies and adapt to arising challengesDesirable:Knowledge of scripting languages like PythonWe are passionate about developing people and this role also offers the opportunity to graduate into the core engineering team should sufficient progress be made in a suitable time frame.BenefitsYou’ll get to work in one of the hottest tech startups in the world of deep tech AI for code, applying state-of-the-art program analysis and synthesis technology to tough problems faced by development teams at the world’s leading companies. At Diffblue we offer flexible working with regular opportunities to collaborate and meet the team in person in Oxford.Company benefits include:Competitive package, including share optionsPrivate health and dental plans (including 24/7 virtual GP service, additional cancer care and mental health cover)8% non-contributory pensionLife insurance & Income Protection schemes (including additional medical, wellbeing support)25 days annual leave + Bank holidays + Christmas shutdownEnhanced family-friendly benefitsFlexible workingAnnual eye tests and £50 contributions towards glassesCycle to work schemeWhile we expect the future of work to continue to be a hybrid model working both remotely and in-office, we do have a great environment in our Oxford-based head office with beautiful open-plan space with lots of natural light.

Junior SDET (Software Development Engineer in Test) - Java

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Diffblue

Mission & Purpose