Backend Engineer

• Design, develop, and maintain enterprise banking applications using Java technologies
• Participate in the full software development lifecycle within an Agile environment
• Manage and administer cloud-native infrastructure, including OpenShift environments and CI/CD platforms
• Provide technical consulting and expertise for cloud infrastructure, Kubernetes-based platforms, and Spring Boot REST applications
• Define and support cloud architecture and infrastructure best practices
• Collaborate with development, operations, and business teams to ensure scalable, secure, and reliable solutions
• Monitor application and infrastructure performance, troubleshoot issues, and implement improvements
• Contribute to architectural discussions and technical decision-making

Senior Java Engineer

• Design and build robust backend components using Java and Spring Boot
• Conduct structured code reviews focused on quality
• Collaborate on development standards
• Manage technical debt
• Participate in hiring and technical interviews
• Maintain documentation

Senior Java Engineer, Python Experience

• Develop, maintain, and improve Ruby on Rails applications supporting business-critical processes and workflows
• Work primarily within monolithic application architectures while contributing to modernization and architectural improvements
• Implement backend features, integrations, and business logic using Ruby and Ruby on Rails
• Collaborate with frontend developers to support integrated user experiences and maintain legacy frontend components where required
• Participate in the implementation of Event-Driven Design and Domain-Driven Design (DDD) principles within evolving application architectures
• Write and maintain comprehensive unit and integration tests using RSpec and/or Minitest
• Work closely with Product Owners, QA engineers, and client stakeholders to refine and implement business requirements
• Manage deployments and support delivery processes across multiple environments, including legacy on-premises infrastructure and containerized platforms
• Contribute to CI/CD processes, automation, and operational improvements using modern DevOps practices and tooling
• Support troubleshooting, debugging, performance optimization, and production stability activities
• Ensure high code quality through code reviews, testing, refactoring, and continuous improvement initiatives.

Ruby Developer

• Design, build, and operate scalable services
• Develop production-grade APIs and microservices
• Collaborate closely with architecture and data engineering teams
• Conduct code reviews and mentor peers
• Lead features from design to deployment

Senior Backend Developer – API Design, Development

• Refactor existing Python backend applications to support the decomposition of a monolith into smaller, decoupled services.
• Identify pragmatic, low-impact changes that improve modularity and separation of concerns without unnecessary redesign.
• Ensure application configuration and settings are environment-based and suitable for deployment across multiple environments.
• Develop and maintain production-grade backend services and APIs in Python with focus on maintainability, reliability, and security.
• Support the transition of applications toward containerized and automated deployment models, working closely with DevSecOps and platform engineers.
• Improve code quality, testing, troubleshooting, and documentation to enable safe incremental change.
• Troubleshoot and resolve functional, integration, and performance issues in existing backend services.
• Document implemented changes and contribute to good backend engineering practices across the team.

Senior Backend Developer, Python

• Provide deep technical expertise in backend development, code reviews, and architectural discussions, ensuring best practices are followed
• Design, develop, test, and deploy backend software solutions using Node.js and Java, adhering to high-quality standards
• Architect and optimize relational database schemas, write efficient queries, and ensure data integrity and performance
• Develop and maintain components for real-time communication, including SIP signaling and RTP streaming
• Explore and implement solutions for audio/video media processing and integration within the contact center environment
• Contribute to the development of contact center-specific features and integrations, understanding the nuances of the domain
• Identify and address performance bottlenecks, ensuring the platform can scale to meet growing demands
• Diagnose and resolve complex production issues, providing timely and effective solutions
• Work closely with product managers, architects, QA engineers, and other stakeholders to deliver high-quality software

Senior Back-end Software Engineer, Node.js, Java

• Working in an Agile environment, where team work is always recognized and appreciated.
• Design, develop and unit test solutions of any size or complexity
• Produce clean code
• Become part of a fast-moving team where quality always comes first
• Understand all of Fourth’s products in detail, how they are integrated with each other, and their business value
• Diagnose defects and provide effective solutions.
• Provide development estimates, be a part of planning sessions
• Understand and support the release management process

Senior .NET Developer – Scheduling

• Design, develop, and maintain scalable services using Python + FastAPI;
• Build and version APIs used by internal tools and customer-facing products;
• Collaborate closely with AI engineers on core AI functionality (prompt/tool orchestration, retrieval patterns, guardrails, performance);
• Rapidly prototype, then harden: ship features, measure outcomes, iterate;
• Partner with platform engineers on deployment, monitoring, and production operations;
• Troubleshoot incidents, improve stability, and reduce operational load over time;
• Develop internal tooling that improves how teams adopt AI across the company.

Senior Python Engineer

• Help shape how users interact with applications by designing and building cloud-native, modern web systems across the stack—from responsive user interfaces to resilient APIs and robust backend services.
• Play a pivotal role in driving the architecture, scalability, and quality of digital solutions that support life-saving therapies.
• Design, develop, and deploy full stack applications using modern JavaScript frameworks (React, Node.js).
• Build and maintain robust, scalable RESTful APIs and backend services.
• Develop responsive and intuitive front-end UIs integrated with system APIs.
• Ensure code adheres to industry best practices, coding standards, and is well-documented.
• Write and maintain automated unit, integration, and end-to-end tests (Jest, Playwright, etc.).
• Collaborate closely with cross-functional teams including Product, Design, and DevOps.
• Architect and implement secure, performant systems using modern DevSecOps practices.
• Refactor and modernize legacy systems while maintaining business continuity.
• Stay up to date with advancements in web technologies, AI-assisted development tools, and industry trends.
• Participate in code reviews, sprint planning, and retrospectives as part of an Agile team.

Full Stack Software Developer – Node.js, React

• Lead and mentor a team of mid/senior backend engineers (4–5), including 1:1s, feedback, and performance management
• Translate product and business goals into clear technical roadmaps, sprint plans, and backend priorities
• Own the backend architecture and technical vision for mobile-first, consumer-facing apps used by tens of thousands of daily active users
• Drive and oversee implementation of new features for our mobile apps, working closely with iOS/Android, Product, Data, DevOps and Trust & Safety teams
• Take key architectural decisions around scalability, performance, reliability, data flows, and infrastructure on AWS
• Modernise and improve a large, Ruby on Rails codebase (including version upgrades and refactoring legacy areas) while keeping systems stable in production
• Identify and resolve performance bottlenecks, improve API speed and reliability, and design effective caching and database strategies
• Establish and continuously improve engineering processes, coding standards, code review practices, and deployment/CI pipelines
• Create and maintain clear technical documentation and design specs for backend systems and major initiatives
• Handle prioritisation and trade-offs in a fast-moving environment with changing quarterly priorities
• Be hands-on with coding and code reviews, especially for complex or high-impact areas, and step in during critical production incidents

Lead Backend Engineer, Ruby On Rails

• Develop, maintain, and optimize web applications using PHP (Symfony framework).
• Work with Doctrine ORM for efficient database modelling, migrations, and query optimization.
• Design and implement robust, scalable, and reusable code following best practices and coding standards.
• Participate in the full software development lifecycle, from requirements gathering to deployment and maintenance.
• Collaborate with front-end developers to integrate user-facing elements with server-side logic.
• Partner with product managers and designers to convert business requirements into effective technical solutions.
• Conduct code reviews to maintain quality, consistency, and adherence to standards.
• Perform thorough testing and debugging to ensure optimal functionality and reliability.
• Optimize application performance and ensure scalability of backend systems.
• Stay current with industry trends and emerging technologies in PHP and Symfony development.

Senior PHP Developer

• Work on stabilization and continuous improvement of an existing enterprise platform
• Investigate and resolve bugs and production issues
• Implement security improvements and system upgrades
• Support the migration and modernization efforts, including transition to Java 21
• Collaborate with cross-functional teams to ensure system reliability and performance
• Contribute to improving code quality, maintainability, and system architecture
• Participate in technical discussions and support long-term product evolution

• Build and implement JavaScript code for rendering ad formats on third-party sites
• Work with Node.js and Puppeteer to deliver, test, and optimize ad solutions
• Use browser APIs (DOM manipulation, fetch, WebGL, sessionStorage, IndexedDB) to collect and process data
• Troubleshoot and debug issues across both client and server environments
• Optimize code and workflows for performance and reliability
• Collaborate with cross-functional teams to integrate ad solutions seamlessly
• Contribute to automation and deployment using tools like Docker, Kubernetes, and bash scripting
• Work on advanced detection and prevention techniques to distinguish real users from bots
• Maintain and optimize high-performance ad rendering solutions, including video formats (VAST)
• Develop tools to ensure ads display reliably, even in challenging environments
• Stay current with modern web technologies and bring fresh ideas to the team

Full-Stack JavaScript Developer

.NET Developer – Mid/Senior

Principal Voice, Backend Software Developer

• Design, architect, implement, review, and test frameworks, libraries, tools, and services primarily using Go.
• Participate in requirement, design, planning, and retrospective meetings as an integral part of an Agile software development team.
• Contribute to successful sprints by implementing items contributing to overall team goals.
• Act as a subject matter expert and evangelist within the company and broader community.
• Be an active maintainer of Mirantis projects by managing contributions and patches to open-source projects, reviewing submissions, and participating in design decisions.
• Participate in product discussions, influence the roadmap, and take ownership and responsibility over new projects to make them happen.
• Be the technical reference to external partners and in-house engineering teams, provide support by sharing knowledge and/or taking on the development effort.
• Contribute to testing via automation and test plan reviews to prevent bugs from entering the product and eliminate regressions, ensuring a quality product every build.
• Ensure that MSR continues to be a first-class and indispensable part of diverse customer solutions, working seamlessly with existing systems including popular orchestrators and other industry-standard components.

Senior Software Engineer – Golang

• Develop and maintain applications using Python, with a focus on integrating AI/LLM, AWS GlueJobs/Azure Functions and other.
• Design, build, and deploy machine learning models.
• Implement ETL processes using AWS GlueJobs/Azure Functions to process and transform large datasets.
• Collaborate with cross-functional teams to define, design, and ship new features and enhancements.
• Optimize applications for maximum performance, scalability, and maintainability.
• Troubleshoot, debug, and resolve software defects and issues.
• Keep up-to-date with the latest industry trends and technologies to ensure the software is current and competitive.
• Provide technical guidance and support to other team members.
• Write clean, maintainable, and well-documented code.
• Participate in code reviews and contribute to improving code quality.

Python Developer

• Develop scalable & reliable systems
• Develop core functionality for our own customer-facing and internal products, systems and data platforms, and e-commerce capabilities using modern frameworks
• Develop extensible platforms and architectures that make it possible to quickly and efficiently launch new products and lines of business
• Develop and maintain integrations with third-party systems
• Develop the APIs powering the web & mobile platforms for our product portfolio
• Drive impact in a team environment
• Work with other software engineers, designers, QAs, product managers, business stakeholders and domain experts

Back End Software Engineer

• Develop and maintain backend services
• Design and implement scalable RESTful APIs
• Work with cloud-based infrastructure and containerized environments
• Collaborate with cross-functional teams to deliver high-quality software
• Ensure performance, reliability, and scalability of applications
• Follow best practices for clean, maintainable, and well-tested code

Senior Java Developer

• Build and deliver scalable 3D simulation environments and automation pipelines
• Create virtual worlds using proprietary software alongside modern 3D editing and simulation tools
• Work with Python and Unreal Engine to develop tools for 3D world generation
• Design, build and optimize pipelines for simulation-ready environments
• Contribute to simulation workflows using CARLA in Unreal Engine
• Support and extend pipelines connected to NVIDIA Cosmos workflows
• Collaborate with CPO and Product Manager on project delivery

See all jobs on JobTailor

Senior Java Engineer

Senior Java Engineer, Python Experience

Ruby Developer

Senior Backend Developer – API Design, Development

Senior Backend Developer, Python

Senior Back-end Software Engineer, Node.js, Java

Senior .NET Developer – Scheduling

Senior Python Engineer

Full Stack Software Developer – Node.js, React

Lead Backend Engineer, Ruby On Rails

Senior PHP Developer

Senior Java Engineer

Full-Stack JavaScript Developer

.NET Developer – Mid/Senior

Principal Voice, Backend Software Developer

Senior Software Engineer – Golang

Python Developer

Back End Software Engineer

Senior Java Developer

Project Engineer – 3D Simulation, Pipelines – Unreal Engine, Python