Senior Software Engineer - JVM, Kotlin

Simple Machines 3; Katowice; Remote; PLN 180,000 - 260,000; Full time

Benefits offered by this job

Health and wellbeing allowance

Training budget

Certifications budget

Equipment allowance

MacBook Pro included

Job summary

Simple Machines 3 is seeking a Senior / Lead Full Stack Engineer to work remotely with our EMEA engineering team. You will build scalable data-driven platforms spanning frontend, backend, data pipelines, and infra, collaborating with clients and internal teams to deliver impactful solutions.

You will contribute to API design, architecture decisions, and ensure robust testing and smooth deployments in a fast-growing, global boutique tech firm.

Qualifications

• Strong written and verbal English
• Consultative approach to software development
• Kotlin/Java JVM foundation
• Data-driven APIs design/implementation
• Frontend exposure: React.js, Tailwind, REDUX, Typescript
• Experience with large-scale web services
• Cloud infrastructure (AWS/Google Cloud/Azure)
• IaC with Terraform or CloudFormation
• Unit and integration testing, TDD/BDD
• SQL databases for data-driven APIs

Responsibilities

• Design and develop backend services for a scalable marketing platform
• Design APIs, applications, and infrastructure and document requirements
• End-to-end delivery, including build, automation, deployment and operations
• Partner with stakeholders to gather requirements and translate to design
• Operate in an Agile delivery environment
• Hybrid remote and in-person collaboration with the team and clients

Skills

English language proficiency

Consultative approach

Kotlin/Java

Data-driven APIs

React/Typescript

Large-scale web services

Cloud platforms (AWS/GC/Azure)

IaC (Terraform/CloudFormation)

Testing (TDD/BDD)

SQL databases

Tools

Docker

Kubernetes

Git workflows

Job description

Senior Full Stack Engineer (Remote)- Multiple roles

Simple Machines is a leading independent boutique technology firm with a global presence, including teams in London, Sydney, San Francisco, and New Zealand. We specialise in creating technology solutions at the intersection of data, AI, data engineering, and software engineering.

We design and build bespoke data platforms and unique software products, create and deploy intelligent systems, and bring engineering expertise to life by transforming data into actionable insights and tangible outcomes.

We engineer data to life™.

As we scale our EMEA Engineering Operations, this role will partner closely with 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.

Please note: You must be based in Poland with citizenship or full-time working rights to be considered for the opportunity

The Role:

As a Senior / 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.

Key Responsibilities:

• 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.

Requirements

Skills & Experience

• Strong written and verbal English
• A consultative approach to software development and software engineering.
• 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 (IaC) experience, such as with Terraform or Cloud Formation.
• In-depth experience with unit and integration testing, and test automation generally. Ideally TDD 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.

Nice to Have

• A passion and proven background in picking up and adopting new technologies on the fly.
• Exposure to Scala, or functional programming generally.
• 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.
• Health and Wellbeing Allowance: 6,129zł 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: 7,355zł annual budget for training, courses, and conferences, with potential for additional funding.
• Certifications: 12,259zł annual budget for certifications and related courses.
• Equipment Allowance: 6,129zł for Poland team members, plus Apple MacBook Pro laptops and necessary accessories.