Senior Full Stack Engineer

Ciklum; Polska; Remote; PLN 180,000 - 300,000; Full time

Job summary

Ciklum is seeking a Senior Full Stack Engineer to join our Poland team. You will work on cross-functional projects, building AI-powered agents, and delivering scalable, secure software using TypeScript, Python, and AWS serverless services.

The role emphasizes observability, design reviews, and collaboration across engineering and product teams. You will contribute to Terraform-driven infra, CI/CD improvements, and internal tooling via React and GraphQL, while promoting best practices and robust

Qualifications

• Proven track record shipping LLM features and prompts.
• Strong TypeScript/Node production experience.
• Proficient Python for evals and scripting.
• Hands-on AWS serverless and IaC experience.
• Experience with NoSQL/SQL data and live migrations.

Responsibilities

• Build production AI agents and TS services on AWS.
• Design agent behavior and sandbox runtimes.
• Evaluate AI features and calibrate models.
• Ensure observability with metrics and logs.
• Maintain Terraform roots and CI/CD pipelines.
• Develop resilient integrations and secure agent code.
• Create internal tools UIs with React and GraphQL.

Skills

LLM production experience

TypeScript

Python

AWS serverless

Infrastructure as code

NoSQL/SQL

Observability

CI/CD

AI-assisted development

English communication

Multi-agent systems

MCP servers / eval frameworks

Prompt-injection defense

React

GraphQL

Java / Spring Boot

Code intelligence / retrieval

Kubernetes

AWS AppSync / EventBridge

Claude Certified Developer

LangGraph / Strands

Tools

Terraform

Lambda

DynamoDB

Bedrock

IAM

GraphQL

React

Spring Boot

Kubernetes

AppSync

EventBridge

LangGraph

Strands Evals

Job description

Ciklum is looking for a Senior Full Stack Engineer to join our team full-time in Poland.

We are a custom product engineering company that supports both multinational organizations and scaling startups to solve their most complex business challenges. With a global team of over 4,000 highly skilled developers, consultants, analysts and product owners, we engineer technology that redefines industries and shapes the way people live.

About the role:

As a Senior Full Stack Engineer, become a part of a cross-functional development team engineering experiences of tomorrow.

Responsibilities:

• Build production AI agents: develop TypeScript services on AWS (Lambda, Step Functions, DynamoDB, Bedrock) using Strands or LangGraph and AI SDKs
• Design agent behavior: define what the model investigates and what code enforces
• Sandbox agents: build read-only runtimes, scoped tool access, worktree-contained reads, and budget/timeout guards against model misbehavior
• Evaluate AI features: build golden sets and production replays, calibrate judges, gate changes on recall, precision and false-positive rate, and compare models and effort levels before release
• Ensure observability: emit reason-coded metrics and structured logs, alert on failures, and investigate production misses in Splunk and VictoriaMetrics
• Run infrastructure: maintain Terraform roots across environments under tagging and permission-boundary rules; improve GitLab CI/CD for build, test, deploy and quality gates
• Build integrations resilient to retries, rate limits, permanent failures and stale state
• Use AI to write/review code; keep agent context current
• Review AI-written changes for security, correctness and maintainability, catching issues tests miss
• Enable teams: configure assistants, skills, hooks and MCP servers; pair with engineers and share proven practices
• Build agent‑facing tools: React and APIs for summaries, dashboards and internal tooling, with outputs readable by agents, CLIs and Slack
• Document systems with architecture/sequence diagrams, runbooks and decision records

Requirements:

• LLM production experience: shipped LLM API features (prompts, tool calling, structured output, long context); can explain release evals, failures and fixes
• TypeScript: strong production TypeScript and Node, async code, testing and monorepo tooling
• Python: proficiency in evals, analysis and scripting
• AWS serverless: Lambda, Step Functions, DynamoDB, IAM, event-driven design and Bedrock
• Infrastructure as code: safely read and modify Terraform across environments
• Data: hands‑on NoSQL/SQL experience, including live schema changes and migrations
• Observability: design metrics, logs and alarms for non‑deterministic systems and debug issues
• CI/CD: proficiency with CI/CD, ideally GitLab CI/CD
• AI‑assisted development: daily AI coding assistant use; verify its output
• Communication: fluent spoken and written English; explain trade‑offs and drive team adoption
• Multi‑agent systems, MCP servers or eval frameworks (e.g. Strands Evals)
• LLM cost control: model routing, prompt caching, token budgets
• Prompt‑injection defense and agent security
• React and GraphQL for internal tools
• Java and Spring Boot for existing service integration
• Code intelligence or retrieval (indexing, symbol search, knowledge bundles)
• Kubernetes, AWS AppSync and EventBridge
• Claude Certified Developer or Architect (Anthropic)

What's in it for you?

• Strong community: Work alongside top professionals in a friendly, open-door environment
• Growth focus: Take on large‑scale projects with a global impact and expand your expertise
• Tailored learning: Boost your skills with internal events (meetups, conferences, workshops), Udemy access, language courses, and company‑paid certifications
• Endless opportunities: Explore diverse domains through internal mobility, finding the best fit to gain hands‑on experience with cutting‑edge technologies
• Flexibility: Enjoy flexibility – full remote working possibilities
• Care: We've got you covered with company‑paid premium medical package through Luxmed
• Benefits: Access the MyBenefit cafeteria platform, allowing you to choose perks that best suit your lifestyle and needs

About us:

At Ciklum, we are always exploring innovations, empowering each other to achieve more, and engineering solutions that matter. With us, you'll work with cutting‑edge technologies, contribute to impactful projects, and be part of a One Team culture that values collaboration and progress.

With delivery centers in Wrocław and Gdańsk, our 300+ professionals in Poland drive forward‑thinking solutions for global clients. Join a community where collaboration sparks innovation—and your impact reaches millions.

Explore, empower, engineer with Ciklum!