Senior Backend Engineer (Kotlin) Job at InStaff

Senior Backend Engineer (Analytics)

At hyperexponential, we're building the AI-powered platform that enables the wor...

Location

United Kingdom , London

Salary:

Not provided

hyperexponential

Expiration Date

Until further notice

Requirements

Built production backend systems with proven experience as a polyglot engineer, ideally with strong Kotlin skills and the ability to work effectively across multiple languages and tech stacks
Delivered scalable cloud infrastructure using AWS and infrastructure-as-code tools like Terraform, with hands-on experience building distributed systems that handle real-world data volumes
Developed data warehousing solutions with hands-on experience building ETL pipelines, data modelling, and orchestration workflows using modern tools (e.g., dbt, Airflow, Spark), demonstrating the ability to transform raw data into reliable, performant analytics infrastructure that supports business decision-making at scale
Collaborated effectively across teams to deliver features that customers actually use, with evidence of translating business requirements into technical solutions that drive measurable impact
Maintained high code quality standards with a commitment to clean, well-documented, maintainable systems and the discipline to build infrastructure that scales with business growth
Demonstrated curiosity about emerging technologies, particularly around data processing, analytics platforms, and AI/ML tools that can enhance developer productivity and unlock new customer value.

Job Responsibility

Build scalable data systems in Kotlin that enable insurers to ingest, process, and explore complex datasets, turning months of manual analysis into real-time insights that drive billion-dollar risk decisions
Design distributed analytics infrastructure on AWS using Terraform, creating robust, cloud-native systems that handle enterprise-scale data volumes while maintaining reliability and performance
Deliver customer-facing analytics features that transform how users understand and optimise risk modelling, building intuitive interfaces for complex portfolio analytics that were previously impossible
Drive technical innovation in data architecture, piloting emerging technologies and AI/ML approaches that continuously improve the analytics experience and unlock new capabilities for customers
Collaborate across disciplines with Product, UX, and Engineering teams to translate complex business requirements into elegant technical solutions that balance powerful functionality with usability
Elevate system quality through robust architecture decisions, comprehensive testing, and clear documentation that makes complex data systems maintainable and scalable as the team grows.

What we offer

£5,000 training and conference budget for individual and group development
25 days of holiday plus 8 bank holidays (33 days total)
Company pension scheme via Penfold
Mental health support and therapy via Spectrum.life
Individual wellbeing allowance via Juno
Private healthcare insurance through AXA
Income protection and Life Insurance
Cycle to Work Scheme
Top-spec equipment (laptop, screens, adjustable desks, etc.)
Regular remote and in-person hackathons, lunch and learns, socials, and game nights

Fulltime

Senior Backend Engineer

We’re looking for a Senior Kotlin Engineer to join our HQ Tech team and help des...

Location

Spain , Madrid

Salary:

Not provided

InStaff

Expiration Date

Until further notice

Requirements

5+ years of experience in backend development using Kotlin or Java
Strong experience building and maintaining distributed systems at scale (1M+ users)
Proven track record delivering customer-facing applications
Experience owning the full lifecycle of a feature: design, coding, testing, deployment, and monitoring
Solid understanding of relational databases, transactions, and query optimization
Hands-on experience with monitoring systems — each team owns their product in production
A pragmatic problem-solver who enjoys tackling complex technical challenges

Job Responsibility

Design and implement scalable services that power Job&Talent’s staffing and workforce management platform
Collaborate with cross-functional product teams to deliver new features across our backend systems
Lead the development of critical components and drive architectural discussions
Mentor engineers and advocate for best practices in Kotlin development, testing, and observability
Continuously optimize performance, reliability, and scalability across our systems
Take part in end-to-end ownership — from design to deployment and monitoring in production

What we offer

competitive pay
meaningful benefits
the opportunity to shape what work looks like for millions around the globe

Fulltime

Senior Software Engineer, Backend

Affirm is reinventing credit to make it more honest and friendly, giving consume...

Location

Canada

Salary:

150000.00 - 200000.00 CAD / Year

Affirm

Expiration Date

Until further notice

Requirements

4+ years of experience designing, developing and launching backend systems at scale using languages like Python or Kotlin
track record of developing highly available distributed systems using technologies like AWS, MySQL and Kubernetes
familiar with processing data offline using frameworks like Spark or Ray
knowledge of stream processing architectures and ability to bridge the gap between online and offline systems with hybrid designs
experience defining a technical plan for the delivery of a significant feature or system component with an elegant, simple and extensible design
write high quality code that is easily understood and used by others
proficient at making significant changes in a large code base, and have developed a suite of tools and practices that enable you and your team to do so safely
experience demonstrates that you take ownership of your growth, proactively seeking feedback from your team, your manager, and your stakeholders
strong verbal and written communication skills that support effective collaboration with our global engineering team

Job Responsibility

own and deliver quarterly goals for your team, lead engineers on your team through ambiguity to solve open-ended problems, and ensure that everyone is supported throughout delivery
support peers and stakeholders in the product development lifecycle by collaborating with product management, design & analytics by participating in ideation, articulating technical constraints, and partnering on decisions that properly consider risks and trade-offs
proactively identify project, process, technology or business issues, advocate for them, and lead in solving them
support the operations and availability of your team’s artifacts by creating and monitoring metrics, escalating when needed, and supporting “keep the lights on” & on-call efforts
foster a culture of quality and ownership on your team by setting or improving code review and design standards for your team, and advocating for them beyond your team through your writing and tech talks
help develop talent on your team by providing feedback and guidance, and leading by example

What we offer

monthly stipends for health, wellness and tech spending
100% subsidized medical coverage, dental and vision for you and your dependents
equity rewards
flexible Spending Wallets - generous stipends for spending on Technology, Food, various Lifestyle needs, and family forming expenses
competitive vacation and holiday schedules
employee stock purchase plan enabling you to buy shares of Affirm at a discount

Fulltime

Senior Backend Engineer

We are looking for highly talented and driven software engineers who take pride ...

Location

United Kingdom , London

Salary:

Not provided

AlphaSights

Expiration Date

Until further notice

Requirements

Degree in a STEM subject (or equivalent experience)
Experience working at a similar level in a mature Engineering team
Technical expertise with at least one programming language (Kotlin or Ruby preferred)
Experience with relational databases
Proven track record of demonstrable impact in previous roles
Highly driven and proactive
Meticulous with high standards and obsessive attention to detail

Job Responsibility

Design technical solutions to business problems and contribute to architectural vision
Ship working code primarily with React, Kotlin microservices, Postgres, and Ruby on Rails
Deploy and iterate using CI/CD tools like CircleCI and Spinnaker
Build competency through learning and development
Maintenance and troubleshooting of services

What we offer

L&D budget to fast-track development of specific technical competencies

Fulltime

Senior Backend Engineer

We are looking for highly talented and driven software engineers who take pride ...

Location

Brazil

Salary:

Not provided

AlphaSights

Expiration Date

Until further notice

Requirements

Degree in a STEM subject (or equivalent experience)
Experience working at a similar level in a mature Engineering team
Technical expertise with Java or Kotlin with Springboot
Experience with relational databases
Proven track record of demonstrable impact
Highly driven and proactive
Meticulous with obsessive attention to detail
English language proficiency (oral and written)
Current permanent residence in Brazil
Resume submitted in English

Job Responsibility

Design technical solutions to business problems
Ship working code (React frontend, Kotlin microservices with Postgres backend, some Ruby on Rails)
Deploy and iterate using CircleCI and Spinnaker for CI/CD
Build competency and use L&D budget
Maintenance and troubleshooting of services

What we offer

L&D budget for technical competencies

Fulltime

Senior Backend Software Engineer

Atlassian is looking for Engineers to join one of our Sydney engineering teams (...

Location

Australia , Sydney

Salary:

Not provided

Atlassian

Expiration Date

Until further notice

Requirements

Expert-level experience with one or more prominent languages such as Java, Kotlin, Golang, Python, C#, C/C++, or Ruby is required
Highly-trusted knowledge in at least one domain and working knowledge in multiple tech domains
Passion for collaborating with and mentoring junior members of the team
Considers the customer impact when making technical decisions
A real appetite for learning and growing, both as an individual and teammate

Job Responsibility

Drive large, complex projects autonomously, from technical design to launch
Determine plans-of-attack on large projects
Tackle complex architecture challenges, apply architectural standards and start using them on new projects
Lead code reviews & documentation as well as take on complex bug fixes, especially on high-risk problems
Be an example for thorough, meaningful code reviews
Partner across engineering teams to tackle company-wide initiatives spanning multiple projects
Transfer your depth of knowledge from your current language to excel as a Java developer
Mentor more junior members

What we offer

Health and wellbeing resources
Paid volunteer days

Senior Backend Software Engineer

Location

India , Bengaluru

Salary:

Not provided

Atlassian

Expiration Date

Until further notice

Requirements

6+ years of experience building and developing backend applications
Bachelor's or Master's degree with a preference for Computer Science degree
Experience crafting and implementing highly scalable and performant RESTful micro-services
Proficiency in any modern object-oriented programming language (e.g., Java, Kotlin, Go, Scala, Python, etc.)
Fluency in any one database technology (e.g., RDBMS like Oracle or Postgres and/or NoSQL like DynamoDB or Cassandra)
Demonstrated ability to design and operate systems that deliver high availability and unwavering reliability for our customers
Real passion for collaboration and strong interpersonal and communication skills
Broad knowledge and understanding of SaaS, PaaS, IaaS industry with hands-on experience of public cloud offerings (AWS, GCP, Azure)
Familiarity with cloud architecture patterns and an engineering discipline to produce software with quality

Job Responsibility

Design, develop, and maintain robust backend systems and components focused on proactive and reactive incident management and post-incident management
Be part of an amazing open and collaborative work environment with other experienced engineers, process engineers, architects, and TPMs
Review code with best practices of readability, testing patterns, documentation, reliability, security, and performance considerations in mind
Leverage data to generate actionable insights that drive continuous improvements in backend performance and incident management processes
Mentor and level up the skills of your teammates by sharing your expertise in formal and informal knowledge sharing sessions
Ensure full visibility, error reporting, and monitoring of high performing backend services
Participate in Agile software development including daily stand-ups, sprint planning, team retrospectives, show and tell demo sessions

Fulltime

Senior Backend Engineer, DeFi Wallet

Blockchain.com is connecting the world to the future of finance. As the most tru...

Location

United Kingdom , London

Salary:

Not provided

Blockchain

Expiration Date

Until further notice

Requirements

Integrity
Highly motivated, self-driven, passionate about crypto currencies
Knowledge of how blockchain systems work, preferably worked closely with two
Ability to find your way around when confronted to a novel problem not many people faced before
Innate curiosity, knowledge of multiple programming languages, strong advocate for the best engineering practices and thrive on learning new technologies
Pragmatic approach to developing clean solutions to complex problems
Pride yourself on consistent high levels of test coverage, strong technical documentation and effective monitoring
Take full responsibility for all the projects you work in
Preferably experience in at least one JVM based language such as Java, Kotlin, Scala or willing to learn these languages

Job Responsibility

Build on our DeFi wallet platform, expanding support for multiple networks
Develop and integrate APIs from new and existing services, to our various product applications
Be a part of a dedicated engineering team committed to applying the highest standards and shipping secure and performant systems
Work in the core of Blockchain.com’s solution, interacting directly with multiple blockchains and internal services
Work extensively with open source technologies (Docker, Kafka, PostgreSQL)
Ensure security is at the forefront of everything you do
Work within interdisciplinary teams to continually deliver the highest quality products to our users
Optimise existing systems for scalability, extensibility and performance whilst building out reusable, modular code for use across Blockchain’s products

What we offer

Full-time salary based on experience and meaningful equity in an industry-leading company
Hybrid model working from home & awesome office location in the heart of London
Unlimited vacation policy
Apple equipment
Work from Anywhere Policy: You can work remotely from anywhere in the world for up to 20 days per year
The opportunity to be a key player and build your career at a rapidly expanding, global technology company in an emerging field
Flexible work culture

Fulltime

Senior Backend Engineer (Kotlin)

InStaff

Location:

Category:
IT - Software Development

Contract Type:
Not provided

Salary:

Requirements:

Additional Information:

Job Posted:
February 18, 2026

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Job Posted:February 18, 2026

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