Kotlin Backend Engineer Jobs

New

Software Engineer (Backend)

We’re looking for a Backend Engineer to join our Growth Engineering team, which ...

Location

Mexico , Mexico City

Salary:

Not provided

EarnIn

Expiration Date

Until further notice

Requirements

3+ years of backend software engineering experience, ideally in distributed or microservice-based systems
Strong fundamentals in service architecture and API design, with experience building reliable, performant systems at scale
Proficiency in at least one modern backend language, such as Kotlin, Java, C#, or Python, and openness to learning new technologies as needed
Experience with SQL databases (e.g., PostgreSQL, MySQL) and familiarity with NoSQL systems is a plus
Familiarity with event-driven patterns (queues, messaging, background jobs) and REST/gRPC services
Collaborative mindset, with experience working alongside product, data, and design teams to deliver user-facing impact
Strong testing and debugging skills, with experience maintaining high-quality services in production
Excellent communication and problem-solving abilities, with a proactive approach to learning and iteration

Job Responsibility

Design and implement backend features that drive EarnIn’s Growth funnel — from onboarding and cross-sell to retention and engagement
Build and maintain scalable, event-driven microservices that enable experimentation, real-time personalization, and data-driven decision-making
Collaborate with Product, Data, and Marketing teams to translate growth hypotheses into technical solutions and run experiments that move key metrics
Ensure system performance, scalability, and reliability, especially under high throughput and real-time conditions
Develop automation and testing frameworks to maintain velocity and confidence in continuous integration and deployment pipelines
Debug and resolve production issues, working across multiple service layers to maintain system stability and uptime
Proactively identify opportunities to generalize solutions, building reusable infrastructure and APIs that accelerate team development
Partner with mobile, web, and analytics teams to ensure cohesive end-to-end experiences across platforms

What we offer

healthcare
internet and cell phone reimbursement
a learning and development stipend
potential opportunities to travel to our headquarters in Mountain View

New

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

PHP/Kotlin Backend Engineer - Roaming

Monta is looking for a PHP/Kotlin Backend Engineer to build the robust, scalable...

Location

Germany , Berlin

Salary:

Not provided

Creandum

Expiration Date

Until further notice

Requirements

Mid-level or above Backend Experience: solid experience building scalable backend systems
Proficient in Kotlin (Micronaut) and PHP (Laravel), or strong experience in one with the ability to quickly master the other in a mixed environment
Experience working with OCPI (Open Charge Point Interface) and understand the complexities of the EV roaming ecosystem
Clear & pragmatic communicator who builds alignment fast
Authentic team player with empathy, openness, and ownership
Comfortable with AI-powered tools to accelerate your work (Claude, Gemini, Codex, etc.), with the willingness to learn more
Spoken and written English skills need to be proficient

Job Responsibility

Own the full lifecycle: Scope out requirements and plan new features in collaboration with the team, taking code from ideation to production
Cross-team execution: Work closely with Ops, Product, Frontend and other Backend teams to navigate ambiguity and ensure features integrate seamlessly
Ensure quality at speed: Perform automated validation and verification testing while supporting your teammates with thoughtful code reviews
Monitor and Maintain: Utilize tools like Grafana and Loki to monitor system health, ensuring reliability for the drivers who depend on us
Own outcomes in a high-trust environment where we value execution over perfection
Navigate ambiguity and shifting priorities — keeping momentum when it matters most
Celebrate wins and learn fast from misses alongside an ambitious, diverse team
Push boundaries with courage and resilience while staying true to our DNA

What we offer

A yearly education budget and extra days off to use it
A friendly and social company culture with movie nights, Friday bars, pub crawls, and more
Free lunch every day
Pension & health coverage to keep you secure for today and tomorrow
Paid parental leave to support life’s big moments
Warrants program - be part of our growth story
Flexible working hours
A one month electric vehicle introduction program (plus access to a shared company EV)

Fulltime

Software Engineer (Kotlin), Institutional

We are looking to hire a Software Engineer to join our Institutional team in our...

Location

United Kingdom , London

Salary:

Not provided

Blockchain

Expiration Date

Until further notice

Requirements

Strong hands-on experience with Kotlin in backend and distributed systems development
Proven expertise building scalable APIs, microservices, and backend platforms for complex financial or data-intensive applications
Familiarity with cloud deployments, and service-oriented architectures
Knowledge of messaging and streaming technologies (NATS, Kafka, or similar)
Solid understanding of algorithms, data structures, databases, and distributed systems
Knowledge of ledger systems is a strong plus
Passion for solving challenging technical and financial problems with clean, maintainable code
Commitment to quality-driven engineering, with a strong focus on testing (unit, integration, performance, and failure recovery)
Experience in fintech, trading, or wealth management platforms is a strong advantage

Job Responsibility

Design and implement scalable, secure, and high-performance backend services in Java/Kotlin that power client-facing applications for trading, custody, and wealth management
Build robust APIs and microservices to support advanced dashboards, analytics tools, and mobile experiences
Collaborate closely with front-end engineers, product managers, and designers to deliver seamless, intuitive experiences for sophisticated investors
Architect solutions for portfolio management, trade execution, settlement, reporting, and analytics tailored to institutional and private clients
Optimize backend systems for low latency, high throughput, and fault tolerance
Integrate security best practices and advanced encryption to safeguard sensitive financial data
Continuously improve backend performance, reliability, and development workflows

What we offer

Full-time salary based on experience and meaningful equity in an industry-leading company
Work from Anywhere Policy: You can work remotely from anywhere in the world for up to 20 days per year
ClassPass
Budgets for learning & professional development
Unlimited vacation policy
Apple equipment
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

New

Staff Backend Engineer

Inworld recently launched an exciting new platform for consumer AI applications,...

Location

Canada , Vancouver

Salary:

150000.00 - 240000.00 CAD / Year

Inworld AI

Expiration Date

Until further notice

Requirements

Excellent programming skills and experience in a statically typed backend programming language, preferably Go, Kotlin, Java or Rust
Experience developing and deploying cloud-based services to at least hundreds of qps (preferably more)
Experience with relational databases (PostgreSQL or MySQL)
Hands-on experience with caching (Redis or Memcached), pubsub/queues, data pipelines (Flink, Beam), and Cloud storage
Excellent verbal and written communication skills, can collaborate and coordinate with other roles and engineer with ease, trusted and well-regarded teammate

Job Responsibility

Establish significant scope: Collaborate with the PMs, engineers and leads to determine the biggest product needs to focus on now
Operate with technical autonomy: You have considerable leeway to suggest how to address a given focus area, including bringing in new technical dependencies or standards where it’s the best choice
Collaborate, execute, deliver: This is the core of the building loop. We aim to optimize for both speed and quality, despite it being decidedly non-obvious how to manage that tradeoff exceptionally well
Reflect and drive improvements: Especially as a Staff Engineer, advocate for and realize system improvements, both related to and independent of key features

What we offer

equity and benefits

Fulltime

New

Staff Backend Engineer

Inworld recently launched an exciting new platform for consumer AI applications,...

Location

United States , Mountain View, California

Salary:

180000.00 - 280000.00 USD / Year

Inworld AI

Expiration Date

Until further notice

Requirements

Excellent programming skills and experience in a statically typed backend programming language, preferably Go, Kotlin, Java or Rust
Experience developing and deploying cloud-based services to at least hundreds of qps (preferably more)
Experience with relational databases (PostgreSQL or MySQL)
Hands-on experience with caching (Redis or Memcached), pubsub/queues, data pipelines (Flink, Beam), and Cloud storage
Excellent verbal and written communication skills, can collaborate and coordinate with other roles and engineer with ease, trusted and well-regarded teammate

Job Responsibility

Establish significant scope: Collaborate with the PMs, engineers and leads to determine the biggest product needs to focus on now
Operate with technical autonomy: You have considerable leeway to suggest how to address a given focus area, including bringing in new technical dependencies or standards where it’s the best choice
Collaborate, execute, deliver: This is the core of the building loop. We aim to optimize for both speed and quality, despite it being decidedly non-obvious how to manage that tradeoff exceptionally well
Reflect and drive improvements: Especially as a Staff Engineer, advocate for and realize system improvements, both related to and independent of key features

What we offer

equity and benefits

Fulltime

New

Staff Backend Engineer

OpenSea is the gateway to web3’s next chapter—where NFTs, fungible tokens, and e...

Location

United States

Salary:

190000.00 - 345000.00 USD / Year

OpenSea

Expiration Date

Until further notice

Requirements

At least 6 years of experience as a software engineer
Strong fluency in event-driven system design patterns, leveraging technologies such as Kafka, Flink, and Debezium, as well as distributed systems more generally
Strong fluency in JVM languages like Kotlin or Java
Strong fluency and opinionated in database choice and schema design for highly performant and scalable applications
Intrinsic interest in leveraging new tools (e.g. AI) to increase work efficiency and quality
Passion for (blockchain) technology, NFTs, and the potential of digital ownership is a huge plus

Job Responsibility

Form, communicate, and execute on a technical vision for the next generation of OpenSea’s architecture that leverages highly scalable and event-driven patterns
Write reliable, low latency marketplace infrastructure software that will eventually process billions of dollars a day worth of transaction volume, including highly performant blockchain indexing systems, order management systems at scale, and REST & Websocket API endpoints
Raise the bar for internal understanding of best practices in building highly performant & event-driven systems with “live” characteristics
Mentor and train other team members and act as an internal thought leader and agitator for architectural rigor and cleanliness

What we offer

Health Benefits: We cover 100% Dental/Vision/Medical for employees and 90% for dependents
Flexible Time Off Policy
Parental Leave: 16 Weeks of Paid Parental Bonding & up to 8 additional weeks for the birthing parent
Mental Health: We offer access to Spring Health, covering 8 therapy & 8 coaching sessions per year
11 Company Holidays
Fidelity 401K Plan
Internet/Mobile Reimbursement Plan
Reimbursement or Monthly Snack Delivery
Company & Team retreats to get together for fun and collaboration
Team Member Co-Working and Gathering Expense

Fulltime

New

Staff Backend Engineer, Speech AI

Our intelligent runtime must seamlessly connect to foundational models to power ...

Location

United States , Mountain View

Salary:

200000.00 - 300000.00 USD / Year

Inworld AI

Expiration Date

Until further notice

Requirements

A BA/BS degree in Computer Science or a related technical field, or equivalent practical experience
5+ years of professional experience in software development, with a proven track record of shipping high-quality, user-facing products
Strong product sense and an ability to think critically about user experience and business impact
Demonstrated experience in building and scaling production-grade backend APIs and distributed systems
Strong proficiency in Python and professional experience with one or more of the following: Java/Kotlin, or Go
Hands-on experience with containerization (Docker) and deploying services on orchestration platforms like Kubernetes
A solid foundation in data structures, algorithms, and system design

Job Responsibility

Own features end-to-end, from collaborating on the initial concept with product managers to shipping and monitoring the final product
Translate product requirements and user needs into robust, scalable, and maintainable backend services and APIs
Design, build, and launch user-facing APIs and backend systems in Python, Java/Kotlin, and Go that deliver seamless voice experiences
Partner closely with Product Managers and ML engineers to define scope, identify technical trade-offs, and drive the product roadmap forward
Write high-quality, production-grade code that powers real-time audio processing, model inference, and complex data pipelines
Champion engineering and product excellence, with a focus on delivering tangible value to our users quickly and iteratively

What we offer

bonus
equity
benefits
relocation assistance

Fulltime

Kotlin Backend Engineer

Ryz Labs

Location:

Category:
IT - Software Development

Contract Type:
Not provided

Salary:

Job Description:

Job Responsibility:

Requirements:

Additional Information:

Job Posted:
December 11, 2025

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Ryz Labs

Location:

Category:IT - Software Development

Contract Type:Not provided

Salary:

Job Description:

Job Responsibility:

Requirements:

Additional Information:

Job Posted:December 11, 2025

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