Senior Software Engineer (JVM, Kotlin)
Senior Software Engineer (JVM, Kotlin)
Simple Machines
Hybrid · Full-time · London, UK
About Simple Machines
Simple Machines is a leading independent boutique technology firm with a global footprint across London, Poland, Sydney and New Zealand. We operate at the intersection of data, AI, machine learning, data engineering, and software engineering—building bespoke platforms and products that turn complex data into real-world outcomes.
We work with enterprises, technology companies, and governments to help them better understand their organisations, customers, and citizens. Our teams design and build large-scale data platforms, intelligent systems, and high-impact software products.
We engineer data to life™.
The Role
As a Senior Software Engineer, you’ll play a key role in delivering complex, scalable systems for ambitious clients. This is a hands-on engineering role where you’ll work across the full stack—backend services, APIs, frontend components, data pipelines, and cloud infrastructure.
You’ll collaborate closely with our internal engineering teams and client stakeholders, influencing technical direction while remaining deeply involved in design and delivery. This role suits someone who enjoys solving hard problems, owning outcomes end-to-end, and operating in a consultative engineering environment.
What You’ll Be Doing
- Design and build backend services for a highly scalable marketing platform
- Own the design of APIs, applications, and supporting infrastructure
- Document technical designs and requirements clearly for both internal teams and clients
- Deliver solutions end-to-end: build, automate, deploy, operate, and support
- Partner with clients and delivery teams to translate business requirements into robust technical solutions
- Work within an Agile, iterative delivery model
- Collaborate in a hybrid setup with both remote and in-person team members and stakeholders
The Team
You’ll join a high-performing engineering team working on a large-scale machine learning platform for a global telecommunications client.
The team operates with a high degree of autonomy and shared ownership. Engineers work across the full stack, support one another’s growth, and collaborate closely with data scientists and adjacent teams to design cross-system solutions.
Strong engineering culture, real influence, and meaningful problems to solve.
What We’re Looking For
Core Experience
- Strong foundation in JVM-based development (Kotlin preferred, Java welcome)
- Experience designing and implementing data-driven APIs
- Background working on large-scale web services
- Solid SQL experience, including schema design and performance-aware queries
- Deep experience with automated testing (unit, integration; TDD/BDD preferred)
Frontend & Full Stack Exposure
- Experience with React, TypeScript, Redux, and Tailwind (or similar modern frameworks)
Cloud & Infrastructure
- Experience with AWS, GCP, Azure, or similar
- Infrastructure-as-code (Terraform, CloudFormation, etc.)
- Containerised deployments using Docker, ECS, Kubernetes, or equivalent
Nice to Have
- Exposure to Scala or functional programming concepts
- Experience with asynchronous and highly concurrent backend frameworks (e.g. Ktor, http4k, Play, RxJava)
- NoSQL experience (DynamoDB, Cassandra, BigTable, Cosmos DB, etc.)
- Strong Git workflow experience and the ability to adapt workflows to project needs
- A genuine appetite for learning and adopting new technologies quickly
Similar roles
EOI: Defence Project Professionals
Decision Analysis Services Ltd·Bristol, United Kingdom
· Location: South West with travel to client sites · Contract: Flexible opportunities for both contract and permanent roles *Please be aware that all offers of employment will be subject to a UK Security Clearance check. To gain this you ordinarily need at least 6 years’ UK residency. * Overview Decision Analysis Services Limited (DAS) is an independent professional services…
- Hybrid
- Full-time
Senior Backend Engineer
Compass Holdings Canada Inc·Toronto, Canada
What you'll do: * Design and implement backend architecture following best software engineering principles * Develop clean, efficient code with tests ensuring code quality * Participate in code reviews and invite others to review your code * Champion the importance of addressing technical debt * Collaborate with multiple engineering teams and departments * 5+ Years of backend engineer experience *…
- Hybrid
- Full-time
- Express Entry — PR day one, no employer
Talent Acquisition Manager
MM Coaching Limited·United Kingdom
Marriage Reset (MM Coaching Limited) helps men save their marriages through results-oriented online coaching - often succeeding where traditional counseling falls short. In under three years, we’ve achieved 10x growth and continue expanding rapidly, delivering exceptional outcomes for our clients every day. How? We’ve focused on growth and the exceptional coaching for our clients and team members. By creating a…
- Remote
- Contract
Développeur(euse) CloudOps / CloudOps Developer
Genetec·Montréal, Canada
La dynamique de votre équipe : CloudOps est une petite équipe qui conçoit et maintient les outils nécessaires au déploiement et à l’exploitation des infrastructures infonuagiques de nos clients. Vous aurez l’occasion de mettre à profit votre passion pour les technologies, le développement et l’automatisation au sein d’une équipe qui partage vos intérêts, tout en jouant un rôle clé dans…
- Hybrid
- Full-time
- Express Entry — PR day one, no employer
Senior Software Engineer, Media Creation
Reddit·United States
Reddit is a community of communities. It’s built on shared interests, passion, and trust, and is home to the most open and authentic conversations on the internet. Every day, Reddit users submit, vote, and comment on the topics they care most about. With 100,000+ active communities and approximately 130 million daily active unique visitors, Reddit is one of the internet’s…
- Full-time
Customer Delivery Manager - Manufacturing
zendbox·Paddock Wood, United Kingdom
ABOUT ZENDLABS Zendlabs is one of the UK's fastest growing contract manufacturers specialising in sports nutrition, health & wellness, nutraceuticals and functional products. From concept through to formulation, procurement, manufacturing, packaging, fulfilment and delivery, we help ambitious brands bring innovative products to market quickly and successfully. THE OPPORTUNITY You will own every customer manufacturing project from receipt of the Purchase…
- Hybrid
- Full-time
Head Receptionist
Town London Ltd·London, United Kingdom
ABOUT US At Motorino, we are dedicated to providing an exceptional dining experience accentuated by our welcoming atmosphere and professional service. Nestled in the vibrant Fitzrovia area, we offer our guests a blend of modern London-Italian cuisine and seasonal ingredients, crafted by our talented kitchen team. THE ROLE We are looking for a friendly and organised Head Receptionist to be…
- Full-time
Senior Data Engineer
Frontline Group·Peterborough, United Kingdom
Do you enjoy turning complex data into reliable, scalable solutions that help teams make better decisions? At Frontline Group, data plays a critical role in supporting operational decision-making, reporting, and future analytics capabilities. We're looking for a Senior Data Engineer to help design, build, and continuously improve the data pipelines, models, and assets that underpin our data platform. If you're…
- Hybrid
- Full-time
