Engineer - back End Developer

il y a 2 semaines

Bruxelles, Belgique Calyptus Temps plein

Want to put your job search on autopilot? Join our platform, complete a 6-minute AI screening interview, and get auto-applied to 100s of high-paying roles. Sign up now at and let the opportunities come to you.
____________________________________________________________
The Role
We are seeking an experienced Backend Engineer who is excited to build the technical backbone of a new generation travel platform. You’ll work with Java and Spring Boot to design and implement scalable, resilient backend services, and use databases like MySQL, MongoDB, and ElasticSearch to power search, personalization, and booking flows. Familiarity with Linux systems, AWS, and microservices architecture will help you ship reliable systems at scale.

Core Responsibilities
Design, develop, and scale backend systems using Java and Spring Boot.
Create low-latency search infrastructure (ElasticSearch, caching, query optimization).
Build and maintain supplier integrations across hotels, chains, and experiences, ensuring stability and fault tolerance.
Implement real-time personalization and ranking logic to improve customer discovery and booking conversion.
Enable AI-powered experiences by building APIs, data pipelines, and scalable systems that support recommendations, personalization, and conversational interfaces.
Develop and maintain database schemas, queries, and stored procedures (MySQL, MongoDB, ElasticSearch).
Deploy and optimize services on Linux and AWS environments (EC2, S3, RDS, Lambda, API Gateway).
Implement and evolve microservices architecture; design APIs for communication between services.
Monitor backend systems in production, troubleshoot issues, and deliver timely fixes.
Collaborate with product, growth, and engineering peers to translate customer needs into backend solutions.
Participate in code reviews, debugging, and documentation to ensure quality and maintainability.
Stay current with new backend and AI technologies, bringing forward ideas for innovation and scale.

Candidate Requirements
~ Bachelor’s or Master’s degree in Computer Science, Software Engineering, or a related field.
~2–5 years of backend development experience with Java and Spring Boot.
~ Strong knowledge of relational and NoSQL databases (MySQL, MongoDB) and ability to design efficient schemas, queries, and stored procedures.
~ Familiarity with ElasticSearch and interest in building low-latency search systems.
~ Hands-on experience with Linux systems and deploying/maintaining backend services in production.
~ Experience with AWS services (EC2, S3, RDS, Lambda, API Gateway) and cloud-native deployments.
~ Understanding of microservices architecture and proven experience designing and implementing APIs for service communication.
~ Strong problem-solving and analytical skills with a focus on scalability, reliability, and performance.
~ Excitement to work in an AI-first company, building systems that power personalization, recommendations, and AI-driven experiences at scale.
~ Excellent communication skills and the ability to collaborate effectively across product, growth, and engineering teams.


____________________________________________________________
Want to put your job search on autopilot? Join our platform, complete a 6-minute AI screening interview, and get auto-applied to 100s of high-paying roles.
Sign up now at and let the opportunities come to you.

  • Back End Developer

    il y a 2 semaines

    Bruxelles, Belgique Fujitsu Temps plein

    Fujitsu is looking for a Back End Developer to work on a project within the EU Institutions, in Brussels. ON-SITE (2 days per week) Expertise: Back-end languages and frameworks such as Java, PHP, Spring boot and Hibernate The web development cycle and programming techniques and tools. Database technology such as Oracle, MongoDB Code versioning tools such as...

  • Back End Developer

    il y a 2 semaines

    Bruxelles, Belgique Fujitsu Temps plein

    DRIVE EFFICIENCY AND GROWTH AT FUJITSU Fujitsu is a leading ICT company 125.000 employees worldwide, more than 140 in Luxembourg, offering a full range of technology, solutions and services. This is an opportunity to join a strong organization within a young, dynamic and flexible work environment, with a real growth opportunities and immediately make an...

  • Senior Back-End Developer

    il y a 3 jours

    Bruxelles, Belgique act digital EMEA - Alter Solutions Temps plein

    We are looking for a Senior Back-End Developer who will join an EU Institution in Brussels! This role requires 50% onsite presence. NATURE OF TASKS • Development of back-end website applications. • Integration of user-facing elements developed by a front-end developer with server side logic. • Implement core business logic. • Creation of servers and...

  • Senior Typescript developer

    il y a 2 semaines

    Bruxelles, Belgique Harnham Temps plein

    Senior TypeScript (Back-End) Developer Location: Hybrid – Brussels (1 day per week in office) Travel: Occasional travel between Belgium and the UK Contract: 6 months (with potential extension) Start date: ASAP Position Overview The client is seeking an experienced Senior TypeScript Developer, specialising in back-end development, to join their engineering...

  • Back End Software Engineer/ServiceNow Engineer

    il y a 3 jours

    Bruxelles, Belgique Skillfinder International Temps plein

    Senior Back-End / ServiceNow Engineer – Onsite in Brussels Start Date: May | 6+ Month Contract | Hybrid We're looking for an experienced Senior Back-End Software Engineer with strong ServiceNow expertise to join our client in Brussels on a long-term contract. If you're passionate about designing smart solutions, improving IT processes, and working in a...

  • Back End Software Engineer/ServiceNow Engineer

    il y a 7 jours

    Bruxelles, Belgique Skillfinder International Temps plein

    Senior Back-End / ServiceNow Engineer – Onsite in Brussels Start Date: May | 6+ Month Contract | Hybrid We're looking for an experienced Senior Back-End Software Engineer with strong ServiceNow expertise to join our client in Brussels on a long-term contract. If you're passionate about designing smart solutions, improving IT processes, and working in a...

  • Back End Developer

    il y a 3 jours

    Bruxelles, Belgique NTT DATA Europe & Latam Temps plein

    NTT DATA – a part of NTT Group - is a Top 10 global IT services provider, headquartered in Tokyo, with over 150,000 employees. We deliver consulting solutions by combining specialized sectorial knowledge, our transformation management skills, and our large technology expertise (data, RPA, AI, low code, cloud, IoT, virtual reality), to keep our clients, as...

  • Senior Java back-end developer M/F

    il y a 2 semaines

    Bruxelles, Belgique Projective Talent | Part of Projective Group Temps plein

    Medior Java Engineer – (Belgium | Hybrid) We are looking for a Medior Java Engineer to strengthen Agile engineering teams working on high-impact financial platforms . You will help build secure, scalable backend systems that support critical digital banking and financial services used by thousands of end users daily. This role is ideal for...

  • Développeur front-end/Développeuse front-end

    il y a 2 semaines

    Bruxelles, Belgique Genesis Consult Temps plein

    Je recherche actuellement un Consultant Front-End Senior Angular pour renforcer une équipe engagée dans un vaste programme de digitalisation au sein du secteur public belge. L'objectif : moderniser et unifier des applications critiques. Un projet techniquement stimulant, avec un impact réel sur la vie des usagers. Votre rôle Vous participez au...

  • Satellit - Senior Developer & Architect

    il y a 2 jours

    Bruxelles, Belgique Satellit Temps plein

    Senior Developer & Architect Job Overview Develop and architect real-time software systems that balance electrical grid assets by integrating renewable and storage resources with forecasting and optimization tools." Key Responsibilities Design system architectures, including APIs, services, and front-end/back-end interactions Provide technical direction to a...