Team Lead (Java)

We are a product company – we build and continuously develop our own Master Data
Management platform. This gives us a stable working environment and provides our people
with a genuine opportunity to influence the shape and direction of the solutions we build.
Instead of working on short-term projects for different clients, you will have the opportunity to
contribute to a product over the long term and see the impact of your work.
We are looking for an experienced Team Lead (Java) who combines strong people leadership
skills with deep technical expertise. As a Team Lead, you will support and develop your team
members while taking responsibility for the technical quality of the systems your team builds
and operates.
This is a broad and comprehensive role, made possible by the way our teams are structured: our
Team Leads work with small, 3–5-person teams and have a very limited number of meetings.
Apart from the daily, you mainly participate in meetings directly related to your team’s work
and needs – typically around 2–3 hours per week in total. This allows you to spend most of your
time working with your team, making technical decisions and supporting people’s development.
We expect you to have a very good understanding of your team’s technology stack, the ability to
organise and coordinate the team’s work, and confidence in making technical decisions. Your
impact will extend beyond your own team, including collaboration with other teams to ensure
that everyone remains focused on delivering value.

The ideal candidate has a strong background in backend development using modern Java
technologies, several years of professional experience, and experience mentoring, leading or
coordinating engineers. We are looking for a team-oriented person who values collaboration,
knowledge sharing and collective problem-solving. A genuine interest in data and databases will
be a strong advantage.
Product Area You Will Be Responsible For
• Data Quality Guard – continuous validation and monitoring of business partner data
(identifiers, addresses and bank accounts), 1,500+ community rules as well as customer-
specific custom rules, a unified data validation API, and dashboards, reports and tools
providing data quality insights. The product is powered by a rules engine built on a
knowledge graph (RDF/SPARQL) and curated global reference data.
• Duplicate Guard – detection, analysis and consolidation of duplicate business partner
records within and across datasets. It includes a matching engine with data cleansing
mechanisms and phonetic, geospatial and exact comparators, continuous duplicate
monitoring, and consolidation rules leading to the creation of so-called golden records.
• Tax Guard – verification and validation of direct and indirect tax identifiers (including EU
VAT), as well as verification of names and addresses against official registers, both in
transactional and monitoring modes through a headless API

Key Responsibilities – People Leadership
• Taking responsibility for the development of team members, including regular feedback
and development conversations
• Organising the team’s work: assigning tasks, monitoring progress and assessing goal
achievement
• Supporting HR in recruitment, onboarding and other people-related processes
• Fostering effective collaboration and a positive team culture
• Managing conflicts and addressing issues related to performance or collaboration
• Supporting team members in developing their skills and progressing in their careers
Key Responsibilities – Technical Leadership
• Providing technical leadership to the team and making key technical decisions
• Taking responsibility for the technical quality of the components developed by the team
• Mentoring team members on technical topics
• Supporting knowledge sharing and the development of technical capabilities within the
team
• Defining and enforcing architectural and procedural standards
• Participating in recruitment and assessing candidates’ technical competencies
• Collaborating with other technical leaders on architecture, performance, quality and
other technical topics

As a Team Lead, you will work closely with the Head of Software Development and Operations
and have an opportunity to influence how the wider department operates. This includes
contributing to strategic processes such as budget planning, DevOps and operations strategies,
and technology decisions across the department.

Required Skills & Technologies
• Java 21
• MongoDB
• Spring Boot
• RabbitMQ
• Kafka
• OpenAPI
• SQL
Experience & Leadership
• Several years of hands-on backend development experience using modern Java
technologies
• Experience leading, mentoring or coordinating a team of engineers
• Ability to define and enforce architectural and procedural standards

Languages:
• Polish – C1 (required)
• English – C1/B2+ (required)

• Semantic Web technologies – RDF and RDF-based data modelling,
ontologies/vocabularies (RDFS, OWL, SHACL), SPARQL querying, triplestores and
knowledge graph design. These technologies are used in the Data Quality Guard rules
engine, where records are translated into RDF triples and validated using SPARQL-based
rules against curated global reference data.
• Spring Expression Language (SpEL), used as the interface between our rules engine and
external data sources
• Redis
• MariaDB