Senior Java Developer

Large company with great ambitions and close relations
Efficy is a leading European Customer Relationship Management (CRM) solution that provides businesses of all sizes with comprehensive, flexible, customizable, and scalable software to support their growth. Efficy’s platform includes solutions for marketing automation, sales, project management, customer service, and customer engagement. Currently, more than 300,000 users across 63 countries rely on Efficy’s tools.

Founded in 2005 and headquartered in Brussels, Efficy has around 500 employees working in local offices across Belgium, France, Spain, the Netherlands, Sweden, Denmark, Finland, Norway, Poland (Warsaw), Hong Kong, or remotely.

Our mission is to contribute to the success of every company by helping them turn customer data into valuable insights while simplifying their employees' work.

At Efficy, no two days are the same, and things evolve quickly. So, fasten your seatbelt and join us on this exciting journey!

A unique work experience & company culture

We want our employees to thrive in their daily lives, which is why you can expect exciting challenges, online music quizzes, onsite ping-pong tournaments, and much more. Communication is informal, and your colleagues are always just a short call away.

Your Impact
As a Senior Java Developer in our development team, you will be instrumental in building and evolving our cloud-native, microservice-based platform. Your work will directly contribute to the scalability, reliability, and performance of our systems, enabling seamless experiences for our users and empowering internal teams. You’ll help shape the technical direction, improve development practices, and foster a culture of engineering excellence across the organization.

Key Responsibilities

• Implement new features and solve complex engineering challenges within a modern, cloud-native microservice architecture.
• Contribute to the evolution of development processes, system architecture, tools, and practices to enhance team productivity and developer experience.
• Collaborate with other development teams to ensure smooth cross-team integration and alignment.
• Proactively monitor and respond to system disruptions, working to prevent issues before they arise.

Primary Technologies

• Languages & Frameworks: Modern Java, Golang
• Infrastructure: Linux, Docker, AWS (ECS, RDS/Aurora, S3, Athena, and more)
• Databases: PostgreSQL (relational), Riak (key-value)
• Tools: Extensive use of open-source frameworks and utilities

This role requires a minimum of 2 to 3 days per week of on-site presence.

About YOU

• You hold a bachelor's degree in computer science or a related field; advanced degrees or certifications are a plus.
• You have 5+ years of professional software development experience, with a strong background in architecture, security, and operational excellence.
• You’ve worked with AWS and Docker in production, and are confident using services like ECS, RDS, API Gateway, CloudWatch, and IAM.
• You’re comfortable managing cloud infrastructure hands-on and enjoy working close to the systems you build.
• You’re creative and solution-oriented, eager to tackle complex challenges and learn new technologies.
• You take ownership of your work, consistently delivering high-quality, reliable solutions.
• You write efficient, maintainable code, especially in systems with concurrency and complex data models.
• You’re a collaborative team player, thriving in agile environments and contributing to a strong engineering culture.

Bonus point for

• AWS certifications or equivalent evidence of advanced AWS competency
• Background in both development and technical operations / infrastructure / system administration
• Experience with distributed systems engineering
• Advanced knowledge of NoSQL and SQL database technologies
• Experience with query engines and data warehouses such as Amazon Redshift and Athena
• Experience with data platforms and data pipeline engineering
• Experience with domain-specific languages (DSL), including parsing and transpilation to other languages, lexical analysis and abstract syntax tree (AST) manipulation
• Professional experience with building SaaS software, especially from web analytics or digital marketing

We offer YOU

• A stable and growing company with an entrepreneurial mindset, where your ideas are valued, and we support you in making them happen
• Flexibility—hybrid work is part of our DNA
• State-of-the-art offices where teamwork is the norm
• International growth opportunities and internal mobility
• A competitive salary package and a referral program
• Engaging events: team lunches, after-work gatherings
• Learning opportunities: languages, technology, product knowledge, sales techniques, and leadership development

Do you have questions about this position? Please contact [email protected]

Find more jobs at https://jobs.efficy.com

Efficy is a people-first employer, committed to providing equal opportunities for all candidates. We take pride in the diversity of our team and welcome you—exactly as you are. This includes your gender identity, sexual orientation, religion, ethnicity, age, or disability status.

If you're interested in joining us, we encourage you to apply. We can’t wait to meet you!

Disclaimer
Efficy does not accept unsolicited assistance from search firms for this employment opportunity. Please refrain from making phone calls or sending emails.

All résumés submitted by search firms to any Efficy employee via email, the internet, or any other method without a valid written search agreement in place for this position will be considered the sole property of Efficy. No fees will be paid if a candidate is hired as a result of an unsolicited referral or through other means.

Department
R&D

Role
Backend Developer

Locations
Warsaw

Remote status
Hybrid