Sopra Steria

IT consulting, digital services, and transformation

Expert Java Developer - Financial Services

Backend EngineeringPosted on Nov 13

Full-timeÎle-de-France, France

About the Job

Requirements

Master Java backend development, including Java 17 or later (ideally Java 21), the Java Virtual Machine, garbage-collection tuning, Stream API, and concurrency.
Have in-depth knowledge of Spring Boot 3.x and Spring Framework 6 internals, including application context, lifecycle, and aspect-oriented programming.
Have experience with Spring Data JPA, Spring Cloud, and Spring Batch.
Design stateless microservices and apply advanced Circuit Breaker, Retry, Bulkhead, Event Sourcing, and Command Query Responsibility Segregation patterns.
Master Hexagonal Architecture, Domain-Driven Design, and Clean Architecture.
Have senior-level REST API expertise, including HATEOAS, versioning, and idempotence.
Master either GraphQL or gRPC.
Have indispensable Kafka experience, including topic design, partitions, consumer groups, and exactly-once processing.
Analyze and optimize latency, throughput, contention, memory leaks, heap dumps, and thread dumps; have experience with applications handling more than 500 transactions per second.
Have expertise in PostgreSQL or Oracle, including advanced indexing, execution plans, and partitioning.
Have mandatory NoSQL experience with MongoDB or Redis for distributed caching.
Master GitLab CI or Jenkins pipelines.
Have practical experience with automated testing using JUnit 5, Testcontainers, WireMock, and Cucumber, and with Test-Driven Development.
Maintain actual code coverage above 80%.
Have expert-level Docker skills and Kubernetes experience with HPA, liveness/readiness probes, ConfigMap, and Helm.
Have public-cloud experience with AWS or GCP and mastery of at least four services, such as EC2, EKS, RDS, SQS, or SNS, or equivalent GCP services.
Have at least 8 years of exclusively Java backend experience and a history of technically complex projects.
Be able to challenge architectural choices and defend technical directions.
Hold a degree from an engineering school or university program, or equivalent.

Responsibilities

Design and develop complex, high-performance microservices.
Structure code according to Clean Architecture and Hexagonal Architecture principles.
Establish development standards and conduct demanding code reviews.
Optimize backend performance, scalability, and response times.
Industrialize CI/CD and integrate advanced testing.
Contribute to the target architecture and participate in technical guilds.
Provide occasional technical supervision to intermediate and senior developers.
Provide expert-level intervention on complex incidents and perform root-cause analysis.

Description du poste

Rejoindre une équipe d’ingénierie senior pour intervenir sur des architectures distribuées à haute volumétrie, en environnement microservices. Le rôle est focalisé sur l’expertise technique, la conception, l’industrialisation et la qualité du code.

Backend & Core Java

Java 17 minimum (idéalement 21) – maîtrise complète JVM, GC tuning, Stream API, Concurrency.
Spring Boot 3.x + Spring Framework 6 : compréhension interne (context, lifecycle, AOP).
Spring Data JPA, Spring Cloud, Spring Batch.

Architecture & Conception

Conception microservices stateless, patterns avancés :
- Circuit Breaker, Retry, Bulkhead, Event Sourcing, CQRS.
Excellente maîtrise Hexagonal / DDD / Clean Architecture .

API & Intégration

API REST niveau senior (HATEOAS, versioning, idempotence).
Maîtrise GraphQL ou gRPC.
Handling inter-service : Kafka indispensable (topic design, partitions, consumer groups, exactly-once).

Performance & Scalabilité

Analyse et optimisation de :
- Latence, throughput, contention.
- Memory leak, heap dump, thread dump.
Expérience sur des applications à haute volumétrie > 500 TPS.

Base de Données

Expertise PostgreSQL ou Oracle :
- Indexation avancée, execution plan, partitionnement.
Une expérience NoSQL obligatoire : MongoDB ou Redis (cache distribué).

CI/CD & Qualité

Pipelines GitLab CI ou Jenkins maîtrisés.
Tests automatisés obligatoires :
- JUnit 5, Testcontainers, WireMock, Cucumber.
- Pratique réelle du TDD.
Code > 80% coverage réel (pas Sonar inflation).

Cloud & Containers

Docker niveau expert.
Kubernetes (HPA, liveness/readiness probes, ConfigMap, Helm obligatoire).
Cloud public : AWS ou GCP, avec maîtrise de au moins 4 services (EC2/EKS/RDS/SQS/SNS ou équivalents GCP).

RESPONSABILITÉS PRINCIPALES

Conception et développement de microservices complexes haute performance.
Structuration du code selon les principes Clean/Hexagonal.
Mise en place des standards de développement, code reviews exigeantes.
Optimisation des performances backend (scalabilité, temps de réponse).
Industrialisation CI/CD et intégration des tests avancés.
Contribution à l'architecture cible et participation aux guildes techniques.
Encadrement technique ponctuel des développeurs intermédiaires/seniors.
Interventions de niveau expert sur incidents complexes (root cause analysis).

Qualifications

Vous êtes diplômé(e) d'une école d'Ingénieur ou d'une formation Universitaire ou équivalent.

8 ans d'expérience minimum exclusivement sur du backend Java .
Historique de projets à forte complexité technique.
Capacité à challenger des choix d’architecture et à défendre des orientations techniques.
Culture de la qualité : code craft, Clean Code, SOLID, lisibilité irréprochable.

Informations supplémentaires

Un accord télétravail pour télétravailler jusqu’à 2 jours par semaine selon vos missions.
Un package avantages intéressant : une mutuelle, un CSE, des titres restaurants, un accord d’intéressement, des primes vacances et cooptation.
Des opportunités de carrières multiples : plus de 30 familles de métiers, autant de passerelles à imaginer ensemble.
Plusieurs centaines de formations accessibles en toute autonomie avec Sopra Steria Academy.
La possibilité de s'engager auprès de notre fondation ou de notre partenaire « Vendredi ».
L'opportunité de rejoindre le collectif Tech'Me UP (formations, conférences, veille, et bien plus encore…).

Employeur inclusif et engagé, notre société œuvre chaque jour pour lutter contre toute forme de discrimination et favoriser un environnement de travail respectueux. C’est pourquoi, attachés à la mixité et à la diversité, nous encourageons toutes les candidatures et tous les profils.

https://www.soprasteria.fr/nous-connaitre/nos-engagements

About the Company

Sopra Steria

IT consulting, digital services, and transformation

Sopra Steria provides consulting, digital services and solutions to help large organizations transform their business through technology. Its offerings cover strategy, systems integration, cloud, cyber security, software development, and managed services, designed to be delivered end to end—from assessing needs and designing a plan to implementing and operating IT systems. The company combines deep knowledge of many industries with a collaborative approach to tailor projects to each client and to deliver measurable, sustainable improvements in performance. Differentiators include its European scale (about 51,000 employees across roughly 30 countries), broad scope—from strategy to operation—and emphasis on practical outcomes that help clients stay competitive. The group’s goal is to put digital to work for its clients in a way that creates a positive, more productive future for all stakeholders.

Company size: 10,001+
Company stage: IPO
Headquarters: Paris, France
Founded: 1968

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