CrawlJobs Logo

Senior Back End Developer

Romania, Bucuresti · Job Posted January 21, 2026
Apply Position
Job Link Share

Job Description

If you are a seasoned Java Developer who thrives on building high-scale, resilient systems join our Agile team and take technical ownership of enterprise-level backend services.

Job Responsibility

  • Technical Ownership: Design and develop high-performance, low-latency backend services using modern Java (21/25)
  • Architectural Influence: Contribute to solution design, proposing modern patterns and tools to optimize time-to-market
  • Leadership: Act as a technical mentor for junior and mid-level developers, fostering a culture of continuous learning and collective responsibility
  • Innovation: Build and maintain internal libraries and boilerplates that define our team’s technical standards

Requirements

  • Java Mastery: 5+ years of experience, with a deep dive into Java 17/21 and the Spring Ecosystem (Boot, Cloud, Security, Data)
  • Solid understanding of Reactive Programming (WebFlux), Microservices, and Event-Driven Architectures
  • Hands-on experience with Apache Kafka (Streams, Schema Registry) and a mix of SQL/NoSQL (PostgreSQL, MongoDB, Redis)
  • Proficiency with Docker, Kubernetes (K8s), and modern CI/CD pipelines (GitLab CI, ArgoCD, Helm)
  • Strong advocate for Clean Code, SOLID principles, and system observability
  • Mandatory higher education (technical university studies)

Nice to have

  • Knowledge / working experience with TMF framework can be an advantage
  • Optional: Technical certifications

What we offer

  • Hybrid working regime 2 days from the office, 3 days remote
  • Special discounts for Vodafone employees, Friends & Family offers
  • Demo telephone subscription - unlimited (voice and data)
  • Voucher for the purchase of a mobile phone
  • Medical subscription to a top private clinic & other medical benefits
  • Insurance for hospitalization and surgical interventions
  • Life insurance
  • Meal tickets
  • Bookster subscription
  • Participation in development programs and challenging projects in the leadership area
  • Access to internal Wellbeing & Recognition events
  • Extra vacation days (for seniority, special events, volunteering)
  • You will benefit from specializations in your field of activity, through programs based on modern training methods and systems

Looking for more opportunities?

Search for other job offers that match your skills and interests.

Similar Jobs for

Senior Back End Developer

8 matching positions

Senior Back End Developer

Madbox is a fast-growing mobile gaming company with a very unique way of develop...
Location
Location
France , Paris
Salary
Salary:
Not provided
madbox.io Logo
Madbox
Expiration Date
Until further notice
Flip Icon
Requirements
Requirements
  • 5+ years of professional experience in backend development, with strong proficiency in Go and solid knowledge of TypeScript/Node.js, and familiarity with React for contributing to internal tool frontends
  • Strong experience with MongoDB as a primary database
  • Proven experience designing and operating scalable microservices and RESTful APIs, with a strong focus on performance and reliability
  • Hands-on experience operating cloud infrastructure at scale, including managed services and networking. GCP experience is preferred
  • AWS experience is also valuable
  • Familiarity with CI/CD practices — Terraform and (GitHub Actions or Jenkins)
  • Comfortable working with observability tools, particularly Datadog
  • Excellent communication skills
  • able to work in English in a cross-functional, international team
Job Responsibility
Job Responsibility
  • Design, build, and scale public-facing APIs in Go, hosted on GCP, serving millions of users with high availability and low latency
  • Ensure backend reliability through comprehensive testing strategies and safe, rollout processes for API releases
  • Monitor, troubleshoot, and optimize backend systems using Datadog, ensuring proactive reliability for player-facing services
  • Collaborate with game teams, data engineers, and product managers to align technical solutions with business goals
  • Contribute to and improve CI/CD pipelines — including GitHub Actions workflows with Terraform, and supporting Jenkins-based game pipelines alongside the dedicated owner
  • Support the development and maintenance of internal tools and services in TypeScript/Node.js, hosted on AWS
  • Fulltime
Read More
Arrow Right

Senior Back End Developer

We are looking for an experienced Senior Back End Developer to join our client's...
Location
Location
United States , Salt Lake City
Salary
Salary:
Not provided
https://www.roberthalf.com Logo
Robert Half
Expiration Date
Until further notice
Flip Icon
Requirements
Requirements
  • Minimum of 7 years of experience in software development with a focus on backend architecture
  • Proven expertise in designing and hosting servers for AI applications
  • Strong knowledge of REST API design and microservices architecture
  • Proficiency in Python, FastAPI, and PostgreSQL
  • Familiarity with AI engineering concepts, including agentic AI and multi-agent workflows
  • Hands-on experience with Continuous Integration/Continuous Delivery (CICD) pipelines
  • Ability to work independently and solve complex technical problems without extensive guidance
  • Experience with Google Cloud Platform for deploying and managing scalable solutions
Job Responsibility
Job Responsibility
  • Architect and deploy AI-native solutions, including custom tools and workflows for AI agents
  • Build and host servers tailored to extend AI capabilities while ensuring optimal performance
  • Design and implement microservices, RESTful APIs, and database schemas for scalable backend systems
  • Develop and orchestrate multi-agent workflows to enhance automation and efficiency
  • Utilize Python, FastAPI, and PostgreSQL to create robust backend solutions
  • Conduct continuous integration and delivery processes to maintain consistent software updates
  • Collaborate with cross-functional teams to identify and resolve technical challenges
  • Ensure system reliability and scalability by leveraging Google Cloud Platform
  • Analyze and adapt to unfamiliar codebases and frameworks independently
  • Drive innovation and problem-solving in AI-first environments
What we offer
What we offer
  • medical, vision, dental, and life and disability insurance
  • eligible to enroll in our company 401(k) plan
Read More
Arrow Right

Senior Back End Developer

As a Senior Back-End Developer, you will be a key contributor to the design, dev...
Location
Location
United States , Boston
Salary
Salary:
Not provided
pixels-360.com Logo
Pixels 360
Expiration Date
Until further notice
Flip Icon
Requirements
Requirements
  • Bachelor’s degree in Computer Science, Engineering, or a related field
  • 5 years of experience in back-end development, with proficiency in [mention specific back-end languages, frameworks, and technologies relevant to your stack]
  • Strong understanding of software architecture, design patterns, and best practices
  • Excellent problem-solving skills and attention to detail
  • Excellent communication and collaboration skills
Job Responsibility
Job Responsibility
  • Back-End Development: Design and implement scalable, high-performance server-side applications
  • Database Management: Develop and optimize database schemas, queries, and performance tuning to ensure efficient data storage and retrieval
  • API Development: Build and maintain robust APIs for seamless integration with front-end systems and third-party services
  • Collaboration: Work closely with front-end developers, product managers, and other stakeholders to ensure seamless integration of front-end and back-end components
  • Code Reviews: Conduct and participate in code reviews to maintain code quality, adhere to best practices, and promote knowledge sharing within the team
  • Scalability: Architect and implement solutions that can handle high levels of traffic and data volume, ensuring the scalability of our systems
  • Problem Solving: Identify and address technical challenges, troubleshoot issues, and implement effective solutions
Read More
Arrow Right

Senior Back End Developer

As a Senior Back-End Developer, you will play a key role in designing and buildi...
Location
Location
Romania , Bucuresti
Salary
Salary:
Not provided
vodafone.com Logo
Vodafone
Expiration Date
Until further notice
Flip Icon
Requirements
Requirements
  • At least 4 years of experience in software development (Java / JEE)
  • Strong experience designing and implementing multi‑layer applications using Spring MVC and Spring Boot
  • Experience working with RESTful APIs and SOAP services
  • Good understanding of application servers such as Weblogic, JBoss, Tomcat
  • Hands‑on experience with JEE technologies (CDI, EJB, JPA, JMS, JTA, JSP, JSF, JAX‑WS, JAX‑RS)
  • Knowledge of security standards such as OAuth and OIDC
  • Experience with relational databases (MariaDB, MySQL, PostgreSQL) and NoSQL databases (MongoDB, Redis)
  • Experience working in an Agile environment (Scrum, SAFe) with tools like JIRA and Confluence
  • Strong communication and collaboration skills
  • Good time management and ability to handle deadlines effectively
Job Responsibility
Job Responsibility
  • Develop applications and services as part of an Agile squad, contributing to iterative delivery cycles
  • Build and optimize backend interfaces and services exposed to internal and external consumers
  • Write clean, reusable, efficient, and well‑documented code
  • Design and implement low‑latency, high‑availability, and high‑performance applications
  • Integrate multiple data sources, systems, and databases into unified solutions
  • Develop user authentication and authorization mechanisms across various systems and environments
  • Understand and apply fundamental design principles for scalable and maintainable backend systems
  • Collaborate with cross‑functional colleagues to ensure smooth operation of integrated services
  • Monitor, troubleshoot, and resolve production issues
  • Actively support interoperability between applications and platforms
What we offer
What we offer
  • Hybrid working regime 2 days from the office, 3 days remote
  • Special discounts for Vodafone employees, Friends & Family offers
  • Demo telephone subscription - unlimited (voice and data)
  • Voucher for the purchase of a mobile phone
  • Medical subscription to a top private clinic & other medical benefits
  • Insurance for hospitalization and surgical interventions
  • Life insurance
  • Meal tickets
  • Bookster subscription
  • Participation in development programs and challenging projects in the leadership area
Read More
Arrow Right

Back-End Senior Developer

We are looking for a highly talented and motivated senior engineer to join our R...
Location
Location
United States , Scottsdale, Arizona
Salary
Salary:
Not provided
skyrepublic.com Logo
Sky Republic
Expiration Date
Until further notice
Flip Icon
Requirements
Requirements
  • 5+ years’ experience in back-end software development
  • Desire and ability to rapidly learn new technologies, put them in practice with tough deadlines, and work through challenging problems
  • Proficient with agile (Scrum/Kanban/XP) software development methodology and continuous delivery techniques and tools (Jenkins, Git, Jira etc.)
  • Familiar with cloud service development ecosystem (Amazon AWS, Google Cloud Platform, Microsoft Azure)
  • Practical development experience with some of the following technologies: Concurrent and strongly typed programming language such as Golang (preferred), C++, Java
  • REST API and JSON schemas
  • Linux container technologies (Docker, Kubernetes, etc.)
  • SQL databases (PostgreSQL, MySQL, Oracle)
  • Information Security concept and cryptography theory
  • Middleware software technologies (Apache Service Mix, IBM WebSphere, Mulesoft, WSO2 etc.)
Job Responsibility
Job Responsibility
  • Contribute to a highly creative and experienced team in an agile and collaborative environment
  • Participate in all phases of development including design, coding, deployment, testing, documentation and maintenance of Sky Republic solutions
  • Apply software development best practices such as unit testing, code review, test automation and continuous delivery to produce high quality software
  • Work with various stakeholders and customers to develop the Sky Republic offering and ensure its adoption
What we offer
What we offer
  • Attractive compensation (salary + bonus + equity)
  • Medical, Dental, Vision, 401K
  • Flexible working hours
  • Fulltime
Read More
Arrow Right

Senior Java Back End Developer

Location
Location
Canada , Mississauga, Ontario, Canada, Toronto, Ontario, Canada
Salary
Salary:
94300.00 - 141500.00 USD / Year
https://www.citi.com/ Logo
Citi
Expiration Date
Until further notice
Flip Icon
Requirements
Requirements
  • 6-8 years of relevant experience in Apps Development or systems analysis role
  • Extensive experience system analysis and in programming of software applications
  • Experience in managing and implementing successful projects
  • Subject Matter Expert (SME) in at least one area of Applications Development
  • Ability to adjust priorities quickly as circumstances dictate
  • Demonstrated leadership and project management skills
  • Consistently demonstrates clear and concise written and verbal communication
  • Experience with Java programming language
  • Experience with Kafka
  • Bachelor’s/Master’s degree in Computer Science/Engineering/STEM subject Or experience in a similar role
Job Responsibility
Job Responsibility
  • Deliver advanced technology projects as an individual contributor providing expertise in the full software development lifecycle, from concept and design, development, to testing and deployment
  • Have the ability to provide technical leadership on projects implemented using advanced knowledge of application development
  • Collaborate effectively with a large global team of software engineers, business analysts, dev-ops and support staff to deliver software solutions for the business
  • Fulltime
Read More
Arrow Right

Senior Software Developer - Back End

Our client is looking for a Senior Software Developer - Back End for a 12 month ...
Location
Location
Canada , Toronto
Salary
Salary:
Not provided
https://www.randstad.com Logo
Randstad
Expiration Date
June 28, 2026
Flip Icon
Requirements
Requirements
  • At least 3 years of experience in .NET/C# and React along with Power BI Reports
  • Experience Customization of Dynamic CRM, Entities, Forms, View, Reports, Ribbon, Menus, and Dashboard
  • Build and Custom Dynamic CRM Workflows, Plug-ins and Complex Microsoft Power Automates flows
  • Customize Dynamics using C#, JavaScript, and HTML
  • Expert knowledge working with Dynamic CRM SDK, Dynamic CRM Web API, Organization Services, OData Standard, Fetch XML and XRM Toolbox
Job Responsibility
Job Responsibility
  • Managing the interchange of data between the server and the users
  • Translating technical systems specifications into working, tested applications
  • Developing detailed programming specifications writing and/or generating code compiling data-driven programs maintaining, and conducting unit tests
  • Resolving and troubleshooting technical problems which arise during the use and operation of software packages, including technical assistance in implementation, conversion
  • Fulltime
Read More
Arrow Right

Senior Back-end Developer Python

As a Senior Backend Engineer, you will play a key role in strengthening and scal...
Location
Location
Spain , Barcelona
Salary
Salary:
Not provided
papernest.com Logo
papernest
Expiration Date
Until further notice
Flip Icon
Requirements
Requirements
  • Bachelor’s or Master’s degree in Computer Science, Software Engineering, or equivalent practical experience
  • 5+ years of backend development experience, including senior-level ownership of architecture and integrations
  • Senior-level expertise in Python (Django/FastAPI), including event-driven or asynchronous architectures
  • Strong experience managing complex API integrations and debugging data inconsistencies across multiple external services
  • Ability to reverse engineer semi-technical workflows (“shadow IT”) to understand business logic before leading refactoring
  • Strong analytical and problem-solving mindset
  • Pragmatic and structured approach in fast-moving environments
  • Fast learner of business domains with the ability to bridge technical and operational topics
  • Professional English required
  • Spanish is a plus
Job Responsibility
Job Responsibility
  • Designing and implementing scalable backend services and APIs
  • Improving system reliability, performance, and maintainability
  • Partnering closely with operations and business stakeholders to understand evolving needs
  • Driving technical excellence and reducing technical debt through pragmatic decision-making
  • Contributing to architectural standards and long-term platform strategy
  • Supporting the scalability of our Spanish market by building robust, future-proof infrastructure
What we offer
What we offer
  • Subscription Bonuses for Company Creators (BSPCE) from your first day
  • Attractive deals on home insurance and green energy
  • Mutual health insurance through Alan, with 50% covered by papernest
  • Swile card for meal vouchers valued at €9 per working day, with 50% covered by papernest
  • Breakfast every Tuesday at the office
  • Fully stocked Ideal Garden refrigerator
  • Discounted rates at partner restaurants
  • Continuous training aligned with your goals
  • Career development opportunities
  • 2 remote work days per week
Read More
Arrow Right