Senior Backend Engineer (B2B SaaS)

iLex; Valbonne; Hybride; EUR 60 000 - 80 000; Plein temps

Résumé du poste

A fintech B2B SaaS startup in Valbonne is seeking a Senior Backend Engineer to enhance their trading platform architecture. The ideal candidate will thrive in a rapidly growing environment and bring strong Java and Spring Boot skills. Key responsibilities include designing backend services, optimizing database access, and ensuring system security. This role offers a competitive salary, flexible working arrangements, and the opportunity to be part of a pioneering fintech team.

Prestations

Competitive salary

Flexible leave structure

Annual allowance for health & wellbeing

Annual allowance for learning & development

Great career development

Qualifications

• 6+ years of backend development experience with Java.
• Strong experience with Spring Boot and Spring ecosystem.
• Hands-on experience with RESTful API design, PostgreSQL and SQL optimization.

Responsabilités

• Design, build, and maintain scalable backend services.
• Optimize database schemas and data access patterns.
• Ensure system security, compliance, and data integrity.

Connaissances

Backend development

Java

Spring Boot

RESTful API design

PostgreSQL

Microservices

Docker

Kafka

Git/GitHub workflows

Cloud platforms

Outils

Maven

Kubernetes

AWS

Liquibase

Description du poste

About us

iLex is a rapidly growing next-gen B2B SaaS fintech start-up headquartered in Singapore, with operations in Hong Kong, London, and Sophia Antipolis. iLex integrates on a single platform access to global loan markets and a large network of investors, primary and secondary deal sites, advanced investor intelligence and market analytics for banks, debt advisors and institutional lenders.

iLex’s vision is to drive liquidity, efficiency, transparency, and security in loan capital markets. In collaboration with the industry, iLex builds cutting-edge solutions across the loan value chain to create more resilient and efficient loan markets. By doing so, we actively contribute to providing better access to financing opportunities for all businesses and projects, advancing global growth and progress.

About the role

We are looking for a Senior Backend Engineer to join our team in Sophia Antipolis. As an integral member of the Engineering team and working closely with the Product and Frontend teams, you’ll be responsible for designing, improving, and maintaining our backend architecture and the codebase.

Our stack

• Core: Java 21, Spring Boot 3 (WebMVC/WebFlux, Validation, Security, OAuth2 Resource Server), RESTful APIs, microservices
• Data: PostgreSQL, Redis, jOOQ, Liquibase
• Messaging & Auth: Apache Kafka, Keycloak (OIDC/OAuth2)
• Build & Infra: Maven, Docker, Kubernetes, AWS (EKS, S3, SQS, SES, Secrets Manager), Jib
• Observability: Micrometer + OpenTelemetry (OTLP), Actuator, structured logging (Logstash)
• Tooling: Testcontainers, Springdoc OpenAPI

You will:

• Design, build and maintain scalable backend services for the iLex electronic market & trading platform
• Design and optimize database schemas, queries, and data access patterns
• Contribute to all phases of product development
• Perform code analysis, troubleshooting, improvement and bug fixing
• Build event-driven architectures using Kafka
• Implement comprehensive monitoring, logging, and observability solutions
• Ensure system security, compliance, and data integrity across all services
• Collaborate with frontend engineers to design efficient API contracts
• Participate in code reviews, architectural decisions, and system design discussions
• Provide L2/L3 application support for the iLex platform hosted on AWS

What we look for:

Must haves:

• 6+ years of backend development experience with Java (Java 17+ preferred)
• Strong experience with Spring Boot and Spring ecosystem (Spring Data, Spring Security, etc.)
• Hands-on experience with:
  • RESTful API design and implementation
  • Relational databases (PostgreSQL) and SQL optimization
  • Build tools (Maven or Gradle)
  • Git/GitHub workflows and modern CI/CD practices
• Experience building and operating microservices and distributed systems
• Understanding of containerization (Docker) and orchestration concepts
• Knowledge of authentication and authorization mechanisms (JWT, OAuth2)
• Experience with message brokers (Kafka, RabbitMQ, or similar)
• Strong problem-solving skills and attention to detail
• Proactive and autonomous, with the ability to take ownership and drive solutions end-to-end

Nice to have:

• Experience with Quarkus or other cloud-native frameworks
• Background in financial services or trading systems
• Knowledge of Jakarta EE
• Hands-on experience with Kubernetes and cloud platforms (AWS preferred)
• Familiarity with event sourcing and CQRS patterns
• Experience with Keycloak or similar identity management systems
• Experience with database migration tools (Liquibase, Flyway)
• Skills in performance optimization and profiling
• Experience with monitoring/observability tools (Prometheus, Grafana, ELK stack)
• Familiarity with DevOps practices and infrastructure as code

Who you are

• Transparency – effectively communicate in good times and bad times
• Simplicity – be focused and straightforward
• Impact – spend time where it matters to get results
• Commitment – take initiative, do what you say, and stick with the journey
• Challenge – be curious and take feedback to continuously improve
• Goodwill – appreciate your team and colleagues

You should also be keen on working in a fast paced, quickly scaling, start-up environment. If you are motivated and results-focused, we’d like to meet you.

What we offer

• Competitive salary
• Flexible leave structure
• Flexible working arrangements so you can work from office, from home and from anywhere
• Annual allowance for health & wellbeing including access to corporate medical and dental insurance plan
• Annual allowance for learning & development
• Great career development in a fast-paced environment
• Regular company social events
• Being part of a team of seasoned professionals providing revolutionary solutions to the market
• Being part of a fintech pioneer with opportunities to grow with us in APAC, EMEA and beyond

iLex is an equal opportunity employer. We celebrate diversity and are committed to creating an inclusive environment for all employees.