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The company is on a mission to become the most customer‑driven telco in the Netherlands. We believe technology only matters when it serves people; when systems work, people can work, and customers get helped better. That’s why we build with care and intent: Human in how we collaborate, Optimistic about what we can improve, and Forward‑thinking in the choices we make for tomorrow.
Role ScopeAs a Senior Software Engineer Integration within our Engineering API team , you bring your passion for technology, problem‑solving mindset, and technical expertise to deliver scalable and impactful integration solutions. You thrive in a data‑driven environment, collaborate effortlessly across teams, and enjoy mentoring others while continuously learning and adapting. You’ll work on critical systems that power the backbone of our operations, with the freedom to apply innovative thinking and shape how platforms connect.
In this role, you take technical ownership of the systems that enable number portability and orchestration, interfacing with the company’s core network systems. Your work spans the full application lifecycle: from influencing solution design and test strategy, to ensuring high availability in business‑critical services. You’ll contribute across multiple projects involving vendors and a wide range of stakeholders, and you’ll be a steady communicator who aligns priorities and expectations across all levels. Alongside delivery, you help raise the bar in the team by mentoring and coaching others and actively driving upskilling initiatives.
Responsibilities- Technical ownership and application lifecycle management of number porting and orchestration systems interfacing with the company core network systems
- Key technical contributor across projects involving vendors and multiple organizational stakeholders
- Influence and enhance technology direction through internal and external collaboration
- Provide input into solution design, operations, test strategy, and technical decisions
- Ensure delivery of high‑availability, business‑critical systems
- Proactively communicate with stakeholders at all levels to align priorities and expectations
- Mentor and coach team members; take ownership of upskilling initiatives
- Senior means full independence, your decisions are data‑driven, you are in control of your own growth and agenda. No guidance needed, only when you say so.
Team
You’ll join our Engineering API team in IT , working in a data‑driven environment where collaboration across teams is essential. The team values learning, knowledge‑sharing, and building integration solutions that reliably power core operational flows.
BenefitsAt the company, you build and manage critical infrastructure at a national scale; ensuring reliability, performance, and security for millions of customers. You work on technology that truly matters, with a direct impact on how our network and IT services perform every day.
In return, we offer a competitive salary and a well‑balanced total rewards package, including:
- A role‑based bonus aligned with your performance
- 30 days of annual leave (full‑time), plus an extra day off after Ascension Day
- Hybrid working model: 3 days in the office and 2 days from home
- A €350 voucher to choose your own mobile phone; yours to keep
- A personal learning budget and access to more than 200 training courses
- A solid pension plan through Zwitserleven
- Discounts on your the company Internet & TV or Klik & Klaar subscription
- A bike lease scheme for sustainable commuting
- Employer contribution to your gym membership
- Access to a wide range of discounts on products and services
Requirements – Must‑Haves
- Strong telco domain knowledge in OSS/VAS inventory (SIM, OTA, number porting) and solid understanding of SIM security protocols and encryption techniques
- Extensive experience with API development, RESTful architectures, and establishing robust API governance models
- Advanced proficiency in Java, C++, Python, or Node.js, with experience architecting and building software from scratch
- Hands‑on experience deploying integration components via Docker and Kubernetes (incl. managed services like EKS or AKS)
- Practical experience with distributed tracing/observability tooling (e.g., ELK, Splunk, Prometheus, Jaeger) to track multi‑service transactions
- Solid command of UNIX, relational databases, and writing optimized SQL queries
- A delivery‑minded senior engineer who communicates proactively, aligns stakeholders, and mentors others to raise team capability
Nice‑to‑Haves
- Bachelor’s or Master’s degree in Computer Science
- Proven seniority with iPaaS or middleware platforms (e.g., Tibco, TYK, Mulesoft, Kafka, Boomi)
- Experience with cloud technologies, CI/CD pipelines, and DevOps methodologies
Location & Working Model
You must already live in the Netherlands, preferably within ~30 km of The Hague, and you’ll work at least 3 days per week from our Den Haag office.
FitEven though we have many different colleagues, we look for a few typical company traits in every new team member. You need to be able to handle a changing organisation. xgiwjmb The world of communications changes every day, and we need to grow along with it. Being naturally curious and interested in the technology we work with and the industry we’re in helps enormously.
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