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Finding the right Scala developer isn’t easy, especially when you need someone who can write functional, scalable, and production-ready code. That’s where great interview questions come in. The right questions reveal how candidates think, not just what they know.  This guide gives you tricky, targeted Scala developer interview questions to help you go beyond surface-level answers and find real talent. Plus, we discuss how you can screen candidates using Scala coding tests for smarter hiring.  

8 tricky Scala developer interview questions to ask when hiring

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Hi there, I'm Raùl, Director of Data at TestGorilla. We’re excited to share more about the Senior Machine Learning Engineer role and our team. <h3 dir="ltr">About TestGorilla</h3>Imagine a world where everyone lands their dream job. TestGorilla is revolutionizing the hiring process through skills-based hiring, empowering one billion people to do just that. Our platform provides scientifically validated tests, enabling companies to hire faster and without bias, based on true skills and potential. We also empower candidates to showcase their abilities and find ideal roles.At TestGorilla, we stand for diversity, act with integrity, and put talent first. We celebrate individuality and creativity and believe in a workplace where you can make a big impact. Our team works in a flexible, autonomous environment with a focus on well-being and results.Join us in creating a future where skills matter most, and everyone has the chance to land their dream job.<h3>About the role</h3>We are looking for an adaptable senior machine learning engineer with proven skills and experience in developing machine learning solutions from ideation through to production, deployment and maintenance of models.Your core tasks involve creating machine learning pipelines to manage model lifecycles using MLOps best practices; managing machine learning and data infrastructure; and experimenting with leveraging LLMs and foundation models. The role is hands-on, delivering high quality maintainable code and will involve close collaboration with product managers, backend engineers and our DevSecOps team.As an AI-forward company you will directly contribute to TestGorilla’s mission by building and scaling our capabilities across the AI, ML and data stack. We deliver user value, fast. We want you to take your models through deployment and into the world where they can make an impact to help us achieve our vision of helping one billion people land their dream job. <h3 dir="ltr">Responsibilities</h3><ul>
<li>Uphold TestGorilla's behaviors and foster an inclusive, supportive culture</li>
<li>Collaborate effectively with global colleagues across teams and time zones</li>
<li>Designing, building, deploying, and maintaining scalable machine learning solutions for our clients and internal users</li>
<li>Developing and managing MLOps pipelines for model training, deployment, monitoring, and iteration</li>
<li>Implementing best practices for versioning (data, code, models), experiment tracking, and reproducibility in ML workflows</li>
<li>Working with infrastructure as code (in Terraform + AWS) to support both data and ML systems</li>
<li>Integrating ML solutions with Generative AI and frameworks like LangChain (e.g., for enhanced analytics, RAG systems, or new product features)</li>
<li>Triaging reporting and data-related requests from different departments, providing insights and solutions to help teams make data driven decisions</li>
<li>Staying abreast of the latest advancements in MLOps, Generative AI, and LLM technologies, and driving their adoption where beneficial.Integrating and operationalizing AI/ML models (esp. via APIs and LLMs)</li>
</ul><h3>What you’ll bring</h3>We're looking for someone who:<ul>
<li>Is passionate about TestGorilla's mission to help one billion people find their dream jobs</li>
<li>Has strong written and verbal communication skills in English, with the ability to articulate complex technical concepts (including ML/AI) in plain English</li>
<li>Thrives in a fast-paced, remote-first environment and can drive initiatives with autonomy with minimal direction</li>
<li>Has skills and experience developing machine learning solutions from scratch using frameworks such as TensorFlow, PyTorch or SKLearn</li>
<li>Has advanced proficiency in Python and a strong command of SQL, particularly for data engineering, MLOps, and ML applications</li>
<li>Has skills and experience with recommender system</li>
<li>Has hands-on skills and experience with Generative AI, including practical application in areas like prompt engineering, fine-tuning, or Retrieval Augmented Generation (RAG)</li>
<li>Possesses strong experience in MLOps, including model deployment, monitoring, CI/CD for ML, and lifecycle management (e.g., using tools like Sagemaker, MLflow, Kubeflow, or custom solutions)</li>
<li>Has skills and&nbsp;previous experience implementing ETL/ELT data pipelines</li>
<li>Has skills and&nbsp;previous experience with infrastructure as code (e.g., Terraform, CloudFormation)</li>
<li>Is good at stakeholder management and organizing requests in a dynamic environment.Experience deploying or integrating AI/ML models/services (e.g., using APIs, understanding MLOps fundamentals)</li>
</ul><ul>






</ul>We actively seek diversity and encourage applications from everyone. If you're interested in this role but your experience doesn't perfectly match the description, please still apply. Studies show that women and underrepresented groups can be hesitant to apply unless they meet every requirement. If this role excites you and you're confident you can do the job, we encourage you to apply!<h3>Bonus skills</h3>While these skills aren’t a requirement, we’d be very interested to hear from you if you have;<ul>
<li>Familiarity with vector databases (e.g., Zilliz, Pinecone, Chroma) is a plus</li>
<li>Experience with machine learning solutions for HR use cases</li>
</ul><h3>What’s in it for you?</h3>Please note: Some specifics, particularly around leave, may vary depending on your country of residence. This will be discussed during the hiring process.<ul>
<li>Global Team:Join a fully remote, mission-driven team from around the world</li>
<li>Competitive compensation: Receive a competitive pay €64,000 - €80,000 + Share Appreciation Rights (SARs)<ul>
<li>This is our maximum hiring range. However, with strong performance, you could grow within this job level to earn up to €96,000.</li>
</ul></li>
<li>Remote &amp; flexible work: Work from almost anywhere*. Enjoy flexible hours and asynchronous work to balance work and life.<ul>
<li>Check out the Countries we currently hire from <a href="https://testgorilla-1680540968.teamtailor.com/pages/hiring-at">here</a></li>
</ul></li>
<li>Remote work budget: €1,000 per year to help you set up your home office</li>
<li>Growth &amp; development: Invest in yourself and your career with a 3.5% L&amp;D budget and clear growth opportunities</li>
<li>Stimulating work environment: Tackle new challenges and work with innovative technology in a dynamic setting</li>
<li>Connect with your team: Join optional fun virtual socials, AMAs with team members and leadership, and regular fun chats. Build a strong sense of community!</li>
<li>TestGorilla community groups: Join peers to build community and boost opportunities for connection, advocacy, and professional development</li>
<li>Parent/Caregiver support: We provide a caregiver-friendly work environment with paid 8-16 week parental leave and tailored return-to-work approaches</li>
<li>Work-life balance: Our unlimited and flexible time off policy empowers you to take the time you need to recharge and maintain your well-being</li>
</ul><h3>Interested?</h3>We believe in using our own product to ensure fair and objective hiring. If this role aligns with your skills and aspirations, we invite you to complete one of our very own assessments. This will give you a firsthand experience of our platform and help us get to know you better. We look forward to hearing from you!TestGorilla is committed to building a diverse and inclusive workplace. We believe that diverse teams are stronger teams, and we encourage applications from people of all backgrounds. We understand that some candidates may experience test anxiety, and we want to assure you that accommodations are available and can be requested prior to sitting our assessments. Your request will not negatively impact your application, as we do not factor this into our review process.

Senior Machine Learning Engineer

Hi there, I'm Raùl, Director of Data at TestGorilla. We’re excited to share more about the Senior Software Engineer, AI/ML Platform role and our team. <h3 dir="ltr">About TestGorilla</h3>Imagine a world where everyone lands their dream job. TestGorilla is revolutionizing the hiring process through skills-based hiring, empowering one billion people to do just that. Our platform provides scientifically validated tests, enabling companies to hire faster and without bias, based on true skills and potential. We also empower candidates to showcase their abilities and find ideal roles.At TestGorilla, we stand for diversity, act with integrity, and put talent first. We celebrate individuality and creativity and believe in a workplace where you can make a big impact. Our team works in a flexible, autonomous environment with a focus on well-being and results.Join us in creating a future where skills matter most, and everyone has the chance to land their dream job.<h3>About the role</h3>We are looking for a versatile senior engineer blending software engineering, data engineering and modern AI/ML development skills. You'll build and operate the critical systems underpinning our AI/ML/data infrastructure, focusing on practical, scalable solutions.Your core tasks involve creating core data infrastructure, integrating and deploying AI models, especially leveraging APIs and LLMs. This requires hands-on work with cloud platforms, containerization, and infrastructure automation tools. It also includes close collaboration with the Backend and DevSecOps teams.Your impact will be direct: enabling new AI-powered features, collaborating across technical boundaries to effectively merge data, software, and AI using modern engineering practices.This position has a very wide impact in the organization, is very visible, and is expected to deliver impactful solutions with minimal supervision.<h3 dir="ltr">Responsibilities</h3><ul>
<li>Integrating and operationalizing AI/ML models (esp. via APIs and LLMs)</li>
<li>Building &amp; maintaining robust data pipelines (ETL/ELT)</li>
<li>Developing and deploying scalable services &amp; APIs, incl. containerization</li>
<li>Managing cloud infrastructure using Infrastructure-as-Code (IaC)</li>
<li>Managing diverse data storage solutions (warehouses, databases)</li>
<li>Implementing reporting (dashboards as-code in Holistics), system monitoring, logging, and alerting</li>
<li>Automating build, test, and deployment workflows (CI/CD)</li>
<li>Troubleshooting issues across data, application, and infrastructure layers</li>
<li>Collaborating closely across all engineering and product teams</li>
</ul><h3>What you’ll bring</h3>We're looking for someone who:<ul>
<li>Experience deploying or integrating AI/ML models/services (e.g., using APIs, understanding MLOps fundamentals)</li>
<li>Strong programming skills, with a preference for Python&nbsp;with demonstrated experience developing and deploying scalable backend services and APIs</li>
<li>Proven experience building, deploying, and maintaining data pipelines (ETL/ELT)</li>
<li>Has Hands-on experience with at least one major cloud provider (AWS, GCP, Azure)</li>
<li>Experience with containerization (Docker) and orchestration (Kubernetes)</li>
<li>Familiarity with Infrastructure as Code principles and tools (e.g., Terraform)</li>
<li>Solid understanding of various database technologies (SQL, NoSQL)</li>
<li>Has experience in implementing and utilising CI/CD practices and tools</li>
<li>Is a strong stakeholder management and communication skills, with the ability to organize cross-functional requests and explain complex ideas in plain English</li>
<li>Is proactive and collaborative, takes initiative and delivers results with minimal supervision</li>
<li>Has eagerness&nbsp;to learn new technologies and adaptable to changing requirements in a fast-moving AI environment</li>
</ul><ul>




</ul>We actively seek diversity and encourage applications from everyone. If you're interested in this role but your experience doesn't perfectly match the description, please still apply. Studies show that women and underrepresented groups can be hesitant to apply unless they meet every requirement. If this role excites you and you're confident you can do the job, we encourage you to apply!<h3>Bonus skills</h3>While these skills aren’t a requirement, we’d be very interested to hear from you if you have;<ul>
<li>Familiarity interacting with APIs from major AI service providers (e.g., OpenAI, Anthropic, Google Vertex AI, AWS SageMaker endpoints, Hugging Face Inference Endpoints)</li>
<li>Understanding of concepts related to deploying and managing Large Language Model (LLM) based applications (e.g., prompt engineering basics, context management)</li>
<li>Experience with or strong understanding of vector databases and embedding generation/retrieval (e.g., Pinecone, Weaviate, Chroma, FAISS)</li>
<li>Familiarity with basic MLOps concepts surrounding model deployment, versioning, and monitoring (even without building the models)</li>
<li>Experience working with the AI/ML services for deployment and integration from the main cloud platforms (AWS, GCP, or Azure)</li>
</ul><h3>What’s in it for you?</h3>Please note: Some specifics, particularly around leave, may vary depending on your country of residence. This will be discussed during the hiring process.<ul>
<li>Global Team:Join a fully remote, mission-driven team from around the world</li>
<li>Competitive compensation: Receive a competitive pay €64,000 - €80,000 + Share Appreciation Rights (SARs)<ul>
<li>While the initial hiring range has a set maximum, your earning potential doesn't stop there. With strong performance, you could grow within this job level to earn up to €96,000.</li>
</ul></li>
<li>Remote &amp; flexible work: Work from almost anywhere*. Enjoy flexible hours and asynchronous work to balance work and life.<ul>
<li>Check out the Countries we currently hire from <a href="https://testgorilla-1680540968.teamtailor.com/pages/hiring-at">here</a></li>
</ul></li>
<li>Remote work budget: €1,000 per year to help you set up your home office</li>
<li>Growth &amp; development: Invest in yourself and your career with a 3.5% L&amp;D budget and clear growth opportunities</li>
<li>Stimulating work environment: Tackle new challenges and work with innovative technology in a dynamic setting</li>
<li>Connect with your team: Join optional fun virtual socials, AMAs with team members and leadership, and regular fun chats. Build a strong sense of community!</li>
<li>TestGorilla community groups: Join peers to build community and boost opportunities for connection, advocacy, and professional development</li>
<li>Parent/Caregiver support: We provide a caregiver-friendly work environment with paid 8-16 week parental leave and tailored return-to-work approaches</li>
<li>Work-life balance: Our unlimited and flexible time off policy empowers you to take the time you need to recharge and maintain your well-being</li>
</ul><h3>Interested?</h3>We believe in using our own product to ensure fair and objective hiring. If this role aligns with your skills and aspirations, we invite you to complete one of our very own assessments. This will give you a firsthand experience of our platform and help us get to know you better. We look forward to hearing from you!TestGorilla is committed to building a diverse and inclusive workplace. We believe that diverse teams are stronger teams, and we encourage applications from people of all backgrounds. We understand that some candidates may experience test anxiety, and we want to assure you that accommodations are available and can be requested prior to sitting our assessments. Your request will not negatively impact your application, as we do not factor this into our review process.

Senior Software Engineer, AI/ML Platform

✨ What does our application process look like? Learn more via<a href="https://vimeo.com/881454515/4a445705fc?ts=0&amp;share=copy"> this video </a>✨ Where do we hire from? Find out more about <a href="https://bit.ly/HiringatTestGorilla">hiring at TestGorilla</a> Hi there, I'm Erica, Senior Engineering Manager at TestGorilla. We’re excited to share more about the Senior Full Stack Engineer role and our team.<h3> </h3><h3>About TestGorilla</h3>Imagine a world where everyone lands their dream job. TestGorilla is revolutionizing the hiring process through skills-based hiring, empowering one billion people to do just that. Our platform provides scientifically validated tests, enabling companies to hire faster and without bias, based on true skills and potential. We also empower candidates to showcase their abilities and find ideal roles.At TestGorilla, we stand for diversity, act with integrity, and put talent first. We celebrate individuality and creativity and believe in a workplace where you can make a big impact. Our team works in a flexible, autonomous environment with a focus on well-being and results.Join us in creating a future where skills matter most, and everyone has the chance to land their dream job.<h3> </h3><h3>About the role</h3>As our Senior Full Stack Engineer, you'll be essential in achieving TestGorilla's vision of helping one billion people land their dream job. You'll lead the design and development of scalable, user-friendly features that empower candidates and hiring teams alike. This isn't just a role; it's your chance to make a real difference by shaping a product that levels the playing field for talent around the world. You’ll directly contribute to delivering a reliable, high-quality platform that helps companies make fair, skills-based hiring decisions at scale. Join our driven, remote-first team, and let’s achieve these ambitious goals together.Want to see what it's like to join the Engineering team and make an impact as a Senior Full Stack Engineer? Get an inside look in this quick video:<figure><iframe src="https://player.vimeo.com/video/1084940176?badge=0&amp;autopause=0&amp;player_id=0&amp;app_id=58479" width="1000" height="563" frameborder="0" title="Senior Full Stack Engineer"></iframe></figure><h3> </h3><h3>Responsibilities</h3>In this role, your responsibilities will include but not limited to:<ul>
<li>Own features end-to-end across the stack -&nbsp;from building robust backend services to crafting delightful user experiences</li>
<li>Design and implement highly scalable and reliable architectures using modern technologies (e.g., Python, Django, Angular, AWS)</li>
<li>Lead the full software development lifecycle -&nbsp;from ideation to deployment and everything in between</li>
<li>Write clean, well-tested, maintainable code across backend and frontend systems</li>
<li>Collaborate closely with product managers, designers, and other engineers to build intuitive and impactful user experiences</li>
<li>Optimize both backend and frontend performance for speed, scalability, and reliability</li>
<li>Mentor and support less-experienced engineers through technical guidance and leadership</li>
<li>Contribute to and improve DevOps pipelines, ensuring efficient and secure deployments</li>
<li>Foster a culture of technical excellence, continuous improvement, and knowledge sharing across disciplines</li>
</ul><ul>
</ul> <h3>What you’ll bring</h3><ul>
<li>Uphold TestGorilla's behaviors and foster an inclusive, supportive culture.</li>
<li>Collaborate effectively with global colleagues across teams and time zones.</li>
<li>You have strong full stack experience delivering production-ready applications with modern backend and frontend technologies</li>
<li>You aim for excellence—pixel-perfect UI, high-quality code, and lightning-fast load times</li>
<li>You have experience designing, implementing, running, and maintaining scalable backend services, including REST APIs and event-driven architectures</li>
<li>You ensure code quality by writing unit, integration, and end-to-end tests</li>
<li>You participate in code reviews, contribute to architecture discussions, and mentor other team members through knowledge sharing and guidance</li>
<li>You’re fluent with relational and NoSQL databases and understand cloud infrastructure, monitoring, and deployment practices</li>
<li>You have a solid understanding of UX/UI design, usability, and accessibility</li>
<li>You highly value building a world-class engineering team and helping others grow</li>
<li>You’re motivated by about continuously improving your skills and learning new technologies</li>
<li>You enjoy influencing others and promote technical excellence while staying open to change</li>
<li>You’re resilient in ambiguous situations and approach challenges from multiple perspectives</li>
<li>You have strong written and verbal communication skills—you validate your decisions and explain them clearly</li>
</ul>We typically expect candidates with 5+ years of engineering experience, and at least 3–5 years of Angular and Python experience, to have the skills above<ul>
</ul>We actively seek diversity and encourage applications from everyone. If you're interested in this role but your experience doesn't perfectly match the description, please still apply. Studies show that women and underrepresented groups can be hesitant to apply unless they meet every requirement. If this role excites you and you're confident you can do the job, we encourage you to apply!<h3 dir="ltr"> </h3><h3 dir="ltr">Bonus skills</h3><ul>
<li>You’ve worked in a SaaS product-based company</li>
<li>You are experienced with Agile methodologies such as Scrum, or Kanban</li>
<li>You have hands-on experience with DevOps, containerization, CI/CD (e.g., Docker, Kubernetes, GitHub Actions)</li>
<li>You have experience with Django or similar web frameworks</li>
</ul><ul>
</ul><h3> </h3><h3>What’s in it for you?</h3>Please note: Some specifics, particularly around leave, may vary depending on your country of residence. This will be discussed during the hiring process.<ul>
<li>Global Team: Join a fully remote, mission-driven team from around the world</li>
<li>Competitive compensation: Receive a competitive pay € 50,000 - € 80,000 + Share Appreciation Rights (SARs)</li>
<li>Remote &amp; flexible work: Work from almost anywhere*. Enjoy flexible hours and asynchronous work to balance work and life. * Check out the Countries we currently hire from <a href="https://testgorilla-1680540968.teamtailor.com/pages/hiring-at">here</a></li>
<li>Remote work budget: €1,000 per year to help you set up your home office</li>
<li>Growth &amp; development: Invest in yourself and your career with a 3.5% L&amp;D budget and clear growth opportunities</li>
<li>Stimulating work environment: Tackle new challenges and work with innovative technology in a dynamic setting</li>
<li>Connect with your team: Join optional fun virtual socials, AMAs with team members and leadership, and regular fun chats. Build a strong sense of community!</li>
<li>TestGorilla community groups: Join peers to build community and boost opportunities for connection, advocacy, and professional development.</li>
<li>Parent/Caregiver support: We provide a caregiver-friendly work environment with paid 8-16 week parental leave and tailored return-to-work approaches</li>
<li>Work-life balance: Our unlimited and flexible time off policy empowers you to take the time you need to recharge and maintain your well-being</li>
</ul><ul>
</ul> <h3>Interested?</h3>We believe in using our own product to ensure fair and objective hiring. If this role aligns with your skills and aspirations, we invite you to complete one of our very own assessments. This will give you a firsthand experience of our platform and help us get to know you better. We look forward to hearing from you!TestGorilla is committed to building a diverse and inclusive workplace. We believe that diverse teams are stronger teams, and we encourage applications from people of all backgrounds. We understand that some candidates may experience test anxiety, and we want to assure you that accommodations are available and can be requested prior to sitting our assessments. Your request will not negatively impact your application, as we do not factor this into our review process.

Senior Full Stack Engineer (Angular + Python)

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