Senior Backend Engineer – API Aggregation & Security

Aduna Global

Łódź

Hybrid

PLN 180,000 - 260,000

Full time

14 days+

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Benefits offered by this job

Employment contract

Hybrid work model

Private medical care

Life insurance

Multisport card

Unlimited paid time off

High ownership and growth

Job summary

Aduna Global Poland is seeking a Software Developer on the Traffic Plane team to help connect Aduna to CSP Service Exposure APIs, architecting scalable backend solutions and driving technical decisions. You will mentor junior engineers, participate in design reviews, and collaborate with SRE, security and product teams to improve observability, performance and reliability.

The role combines hands-on coding with architectural influence in a hybrid setup based in Łódź, offering private medical

Qualifications

5+ years building and operating backend services, distributed systems, or large-scale integrations in production.
Experience as a Senior Developer or equivalent technical role at a technology company.
Track record of delivering meaningful technical initiatives with availability, performance, and security requirements.
Experience integrating with telecom service API.
Background in SRE, DevOps, or infrastructure engineering.
Strong expertise in backend and integration design: service-to-service communication, data consistency, idempotency, and resiliency patterns (retries, circuit breakers, backpressure).
Proficiency in at least one backend language such as Go, Java, or Python.
Experience with cloud platforms (Azure, AWS), Kubernetes, Service Meshes like Istio, Caches like Redis and message brokers (Kafka or similar).
Expertise in optimizing ELK Stack (Elastic Search, Log Stash, Kibana).
Hands-on experience with infrastructure as code, CI/CD, and GitOps (Terraform, FluxCD, GitLab CI or similar).
Strong understanding of observability, SLOs, capacity planning, and performance engineering.
Expertise to identify and solve performance bottlenecks for high throughput systems.
Excellent communication skills across engineering, product, and executive audiences.
Bachelor's degree in Computer Science, Engineering, or equivalent practical experience.

Responsibilities

Contribute to the technical direction and architectural decisions for Aduna’s API aggregation.
Participate in and lead design reviews for API aggregation: Service Exposure connectors, Authentication and Authorization, observability, logging, security and metering.
Apply and help evolve technical standards and best practices; evaluate new technologies and propose improvements to the API aggregation.
Identify risks and contribute to architectural improvements addressing scalability, resilience, and operational complexity.
Tackle complex technical problems spanning Aduna services, CSP Service APIs, and external partners; contribute to incident investigations and drive corrective actions to completion.
Optimize end-to-end request flows, identify performance bottlenecks, and evolve the architecture for high throughput and low latency.
Collaborate with Product to translate business goals into technical solutions; improve developer productivity through better tooling, CI/CD, and automation.
Mentor engineers on system design, operational excellence, and technical decision making.
Raise the engineering bar through code reviews, design feedback, knowledge sharing, and promoting rigor in testing, observability, and security.