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Senior Full-Stack Developer

Location: Hybrid (East - Flanders)
Employment Type: Full-Time

About the Opportunity

We're partnering with an ambitious, technology-driven organisation that is building a modern, scalable digital platform with significant growth plans. As the business continues to expand, we're seeking a Senior Full-Stack Developer to take ownership of a key product and play a central role in shaping its technical direction.

This is an exciting opportunity for an experienced developer who enjoys combining technical ownership with hands-on development. You will play a pivotal role in architectural decisions, product evolution, and the growth of the engineering function.

Key Responsibilities

Design, build, and enhance core product features across the full technology stack.Contribute to architectural decisions and technical strategy to ensure scalability and maintainability.Collaborate with product, engineering, and business stakeholders to deliver impactful solutions.Champion engineering best practices, quality standards, and modern development approaches.Leverage AI-powered tools and emerging technologies to improve development efficiency and outcomes.Support the growth and maturity of the engineering function through technical leadership and knowledge sharing.

What We're Looking For

6+ years' professional software engineering experience.Strong JavaScript and TypeScript expertise.Proven experience balancing hands-on development with architectural decision-making.Experience with cloud platforms such as AWS, Azure, or GCP.Experience building modern web applications using Node.js (NestJS) and React or Next.js.Familiarity with Docker, CI/CD, and modern DevOps practices.Experience with PostgreSQL or other relational databases.Strong communication, stakeholder management, and problem-solving skills.Enthusiasm for AI-powered development tools and emerging technologies.

Why This Opportunity?

This is an opportunity to join a growing organisation where you'll have genuine ownership, influence, and impact. You'll work on a modern technology platform, help shape technical direction, and play a key role in the next stage of product growth.

If you're a senior Developer who enjoys solving complex challenges, taking ownership, and building scalable products in a collaborative environment, we'd love to hear from you.

GCS is acting as an Employment Agency in relation to this vacancy.

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Senior Full-Stack Developer

About the role

This is a hands-on senior position where you'll play a key role in shaping the technical direction of a growing product. You'll combine architecture and technical leadership responsibilities with active software development, working closely with the product and stakeholders.

What you'll do

Take end-to-end technical ownership of a core product, from architecture through to delivery and ongoing evolution.Help drive technical decision-making and contribute to scalable, maintainable system design.Build and maintain applications across the full technology stack, including backend services, frontend experiences, APIs, and third-party integrations.Support the transition of platform knowledge from external partners to the internal team, ensuring long-term ownership and sustainability.Establish and promote engineering best practices while mentoring and supporting other developers.Collaborate with stakeholders and end users to understand product usage, identify challenges, and translate business needs into technical solutions.Work closely with product and design teams to help shape the product roadmap and user experience.

Must have

6+ years of professional software development experience.Strong experience building and maintaining modern web applications across both frontend and backend environments.Proficiency in modern programming languages and frameworks used for full-stack development.Experience designing scalable, maintainable software systems and contributing to application architecture.Proven ability to lead technical discussions and make architectural decisions.Comfortable balancing hands-on development with technical leadership responsibilities.Experience working with APIs, integrations, and distributed systems.Familiarity with containerization technologies and cloud-based development practices.Experience working with relational databases and data modeling.

Should have

Experience with cloud platforms and modern software delivery practices, including automation, CI/CD, infrastructure management, and monitoring.Knowledge of Dutch or French, in addition to English.

Nice to have

Exposure to multiple programming languages, frameworks, or technology ecosystems.Experience working in regulated industries such as financial services, compliance, healthcare, insurance, or similar domains.Experience scaling products in a high-growth or startup environment.

GCS is acting as an Employment Agency in relation to this vacancy.

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Senior Full Stack Developer - Identity & Access ManagementPosition Summary

We are seeking an experienced Senior Full Stack Developer to join a high-performing engineering team supporting enterprise Identity & Access Management (IAM) applications within a large-scale security organization. This role will focus on the design, development, integration, and modernization of secure enterprise applications used internally across the organization.

The ideal candidate will possess strong expertise across both frontend and backend development, with deep experience in Angular, Java, Spring Boot, REST API development, cloud-native AWS services, and secure application development practices. This individual will play a key technical leadership role within the team, mentoring junior developers, contributing to architectural decisions, and driving secure, scalable cloud migration initiatives.

This is an opportunity to work within a security-first engineering environment responsible for mission-critical IAM platforms and integrations.

Key ResponsibilitiesDesign, develop, enhance, and maintain enterprise IAM applications and integrationsBuild scalable frontend applications using modern Angular frameworksDevelop secure backend services and REST APIs using Java and Spring BootParticipate in cloud migration and modernization initiatives, including transitioning legacy applications to AWS cloud-native architecturesCollaborate with architecture teams, security stakeholders, and cross-functional engineering teamsLead technical discussions, contribute to solution design, and drive engineering best practicesMentor and support junior and mid-level developers within the teamEnsure applications meet security, compliance, and enterprise development standardsImplement secure authentication and authorization mechanisms using industry-standard protocolsParticipate in code reviews, troubleshooting, testing, and deployment activitiesSupport CI/CD, monitoring, and containerized deployment environmentsRequired Skills & ExperienceBackend DevelopmentStrong hands-on experience with Java developmentExperience with Java 17 or newerExtensive experience with Spring Boot and Spring ecosystem frameworksStrong expertise designing and developing secure REST APIsExperience building enterprise-grade backend servicesFrontend DevelopmentStrong experience with Angular (Angular 21/22 preferred or recent versions)Experience developing enterprise UI applicationsStrong understanding of frontend architecture and component-driven developmentCloud & DevOpsHands-on experience with AWS cloud services, including:AWS LambdaDynamoDBS3CloudWatchECS/FargateExperience with cloud-native and serverless application developmentExperience with Docker/containerization technologiesExperience supporting application cloud migration initiativesSecurity & IAMStrong understanding of Identity & Access Management conceptsExperience implementing secure authentication and authorization solutionsKnowledge of:OAuth 2.0OpenID Connect (OIDC)JWT token-based authenticationSpring SecuritySecurity-first development mindset with experience following secure coding and compliance standardsDatabases & CachingStrong experience with MySQLExperience with MongoDBExperience with Redis or caching technologiesLeadership & Soft SkillsProven ability to lead technical initiatives and mentor development teamsAbility to work independently and drive solutions with minimal oversightStrong communication and stakeholder management skillsExperience collaborating with architecture, security, and DevOps teamsAbility to contribute to technical design and architectural decision-makingPreferred QualificationsPrevious experience working within IAM or enterprise security environmentsExperience modernizing legacy applications into cloud-native architecturesExperience leading or mentoring development teamsFamiliarity with enterprise compliance and secure development standards

GCS is acting as an Employment Business in relation to this vacancy.

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