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Core Competencies
Role fitCore Competencies
Use this summary to align your resume positioning with the role.
Demonstrates extensive backend engineering expertise with a focus on high-traffic authentication systems, including proficiency in Java or Kotlin development, and a solid understanding of JVM internals. Capable of leading cross-team delivery and collaborating on security-sensitive architecture decisions while utilizing AI tools to enhance engineering workflows.
Highest-signal resume keywords
Java DevelopmentKotlin DevelopmentHigh-Traffic Production SystemsCross-Team DeliveryIdentity Providers
ATS Keywords
Tailor your resumeApplicant Tracking System Keywords
Tip: use these terms in your resume and cover letter to boost ATS matches.
Hard Skills
Backend EngineeringToken-Based Sign-InMonitoring and AlertingLoad TestingCapacity PlanningPerformance Bottleneck IdentificationFeature FlagsCanary ReleasesZero-Downtime MigrationsAI Tools
Soft Skills
CollaborationDecision-MakingCommunication
Tools & Technologies
KeycloakOAuth2OIDCReactTypeScriptKafkaCDC
Industry Keywords
Authentication MigrationIdentity ProviderSecurity PracticesMobile Authentication
Tech Stack
Tools & technologiesJavaKafkaKotlinReactTypeScript
About the role
Key responsibilities & impact- Lead the next phases of the multi-year authentication migration to a self-hosted, Keycloak-based identity provider
- Complete token-based sign-in for Doctolib Pro apps
- Make the identity provider the single source of truth for user data
- Own the reliability of high-traffic authentication systems end-to-end, including monitoring, alerting, SLOs, incident resolution, post-mortems, and safe rollout practices
- Drive cross-team delivery independently through design documents, decision memos, alignment across dependent teams, and explicit trade-offs
- Collaborate with the Product Security team on security-sensitive architecture decisions and changes
- Contribute to frontend development in React and TypeScript on IAM platform interfaces
- Use AI tools daily and help establish repeatable AI-augmented workflows across the team
Requirements
What you’ll need- 7–10+ years of backend engineering experience
- Hands-on, daily Java or Kotlin development
- Solid understanding of JVM internals, including garbage collection, memory management, multi-threading, and profiling
- Proven experience building and operating high-traffic production systems at scale
- Experience with load testing, capacity planning, horizontal scaling, caching, and performance bottleneck identification
- Experience defining monitoring, alerting, and SLOs; leading incident resolution; writing post-mortems; and shipping changes safely via feature flags, canary releases, and zero-downtime migrations
- Experience leading complex, multi-week cross-team delivery independently, producing design documents, driving alignment, and making trade-offs explicit
- Daily use of AI tools in engineering workflows and critical validation of their outputs
- Fluent English, written and spoken
- Prior experience with identity providers such as Keycloak, OAuth2, and/or OIDC is desirable
- Hands-on security practices for exposed, high-traffic endpoints are desirable
- React and TypeScript frontend experience is desirable
- Exposure to Kafka/CDC is desirable
- Exposure to mobile authentication is desirable
Benefits
Comp & perks- A Deutschlandticket (Germany-wide public transport pass) fully paid for by Doctolib
- 28 vacation days + 1 additional day for each full calendar year of employment (up to a maximum of 30 days)
- Work from abroad for up to 10 days per year thanks to our flexibility days policy
- Company health insurance with great supplementary benefits through our partner Allianz
- Company pension scheme (bAV) through Allianz with an employer subsidy of 40% (15% within the probationary period)
- The Doctolib Parent Care program, which includes one month additional parental leave and much more
- Enrollment in Doctolib's long-term employee value sharing plan called DoctoGrowth
- Free mental health and coaching services through our partner Moka.care
- Subsidized sports membership through our partner Urban Sports Club
- A flexible workplace policy offering both hybrid and office-based mode
- Subsidized meal benefit
- For caregivers and workers with disabilities, a package including an adaptation of the remote policy, extra days off for medical reasons, and psychological support
- Access to the best AI tools for coding, development and dedicated training