Hybrid Principal Full Stack Engineer – JVM, Kotlin

at Simple Machines

• Job title: Principal Full Stack Engineer – JVM, Kotlin
• Job type: Full Time
• Experience level: Senior
• Salary: Not specified
• Degree requirement: Bachelor's Degree
• Tech skills: AWS, Azure, Cassandra, Cloud, Docker, DynamoDB, HBase, Java, JavaScript, Kotlin, Kubernetes, NoSQL, React, Redux, RxJava, Scala, SQL, Terraform, TypeScript
• Location requirements: Hybrid, Warsaw, Poland

About the role

• Principal Full Stack Engineer at Simple Machines driving scalable, sophisticated solutions across technology stack. Leading a team while collaborating with internal members and clients in a hybrid environment.

Responsibilities

• **The Role:**
• As a **Principal (Technical Lead) Full Stack Engineer **at **Simple Machines**, you’ll be at the heart of groundbreaking projects, collaborating closely with both our talented internal team and forward-thinking clients. In this hands-on role, you'll drive the development of sophisticated, scalable solutions across the full technology stack—from intuitive frontends and robust backends to powerful data pipelines and resilient infrastructure. If you’re passionate about solving complex problems and pushing the boundaries of what’s possible, this role offers the perfect platform for you to make a real impact.
• **Responsibilities:**
• Leading a small team of highly technical, talented Engineers.
• Responsible for design and technical development of backend services for a highly scalable marketing platform.
• Responsible for designing the APIs, applications, and infrastructure the team develops, and documenting the technical requirements and design for the client.
• Responsible for end-to-end delivery and support, including build, automation, deployment, and operations, for everything that is developed.
• Partner with client stakeholders, and team members, to gather business requirements, collaborate on design decisions, and translate them into technical and design requirements.
• Operate within an iterative delivery team using Agile delivery tools and practices.
• Hybrid remote and in-person collaboration with the delivery team and client stakeholders.
• **Applications Conditions**
• Must have full working rights for Poland - Sponsorship is not available.
• Reside close to Warsaw to attend team meetings in person.
• **About the team:**
• As we scale our EMEA engineering operations, this role will be remote-based, assigned to our UK leadership team and will focus on supporting our UK-based clients. While you’ll enjoy the flexibility of working remotely, you’ll be closely aligned with our UK delivery teams and client stakeholders, ensuring time-zone overlap and easier collaboration.
• Each team member has varying degrees of strength in each area, but all work together across the full stack and assist one another to learn and contribute.
• The engineering team enjoys a high degree of autonomy over technical design and actively engages with stakeholders to design solutions. They also actively engage with data scientists and other teams to design and document cross-system solutions.

Requirements

• **What we are looking for:**
• A consultative approach to software development and software engineering.
• Working closely with the UK Engineering technical leadership.
• Core foundation in programming, especially in **JVM languages** (particularly Kotlin or Java).
• Experience designing and implementing data-driven APIs.
• Exposure to frontend development (particularly **React.js, Tailwind, REDUX, Typescript)**
• Past project experience with **large scale webservices.**
• Cloud infrastructure experience with **AWS and/or Google Cloud**, Azure, etc.
• Infrastructure-as-code experience, such as with Terraform or Cloud Formation.
• In-depth experience with unit and integration testing, and test automation generally. Ideally TAA and/or BDD
• Experience working with SQL databases in the context of implementing data-driven APIs, and designing database schemas and queries to meet business requirements.
• A passion and proven background in picking up and adopting new technologies on the fly.
• Exposure to Scala, or functional programming generally.
• Exposure with highly concurrent, asynchronous backend technologies, such as Ktor, http4k, http4s, Play, RxJava, etc.
• Exposure with DynamoDB or similar NoSQL databases, such as Cassandra, HBase, BigTable, or Cosmos DB.
• Exposure with Git workflows, and the ability to tailor the workflow to project needs.
• Exposure with containerised application deployment using Docker, Amazon ECS, Kubernetes, etc.

Benefits

• **What We Offer in Poland:**
• Salary: Competitive salary and benefits package.
• Join a fast growing team - 30% growth in the last 12 months.
• Hybrid working environment, 1-2 days in the Warsaw office.
• Health and Wellbeing Allowance: 6,129*zł*‎ allowance per year to be used for any food and non-alcoholic beverages during business hours, healthcare, gym memberships, sporting goods and accessories, and any wellness appointments.
• Professional Development: 7,355*zł*‎ annual budget for training, courses, and conferences, with potential for additional funding.
• Certifications: 12,259*zł*‎ annual budget for certifications and related courses.
• Equipment Allowance: 6,129*zł*‎ for Poland team members, plus Apple MacBook Pro laptops and necessary accessories.