Senior Full Stack Engineer

About the Position

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

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.

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

• Full Stack & Versatility: Broad technical perspective with an emphasis on adaptability across modern software stacks and architectures, favoring breadth and quick ramp-up over narrow specialization.
• Frontend & TypeScript: Strong production experience with modern React and TypeScript (including Node.js, async patterns, testing, and monorepo tooling)
• Backend & Scripting: Working proficiency with Python for backend services, evaluations, analysis, and automation tooling
• AWS Beyond Serverless: Practical hands-on experience across the AWS ecosystem-extending beyond serverless (Lambda, Step Functions, DynamoDB, Bedrock) to broader architectural components such as containers (ECS/EKS), networking, compute, and IAM
• LLM features in production: Has shipped features leveraging LLM APIs (prompts, tool calling, structured output, long context) and can describe the eval that gated release, what failed, and what changed
• AI Champion Mindset: Enthusiastic, proactive embrace of AI-assisted engineering tools in daily workflows (e.g., Copilot, Cursor, LLM APIs) combined with the drive to champion AI-first practices and productivity across the team
• Infrastructure as Code: Able to read and safely modify Terraform configurations across environments
• Data: Hands-on experience with both NoSQL and SQL stores, including schema changes and live-system migrations
• Observability: Able to design metrics, logs, and alarms for non-deterministic systems, and effectively debug production issues from them
• CI/CD: Proficiency with modern CI/CD pipelines, ideally GitLab CI/CD
• Communication: Fluent written and spoken English, with the ability to articulate trade-offs clearly and align team members around technical decisions

Nice to Have

• Multi-agent systems, MCP servers, or evaluation frameworks
• LLM cost control: model routing, prompt caching, token budgets
• Prompt-injection defense and agent security
• GraphQL for internal APIs and tooling
• Code intelligence or retrieval work (indexing, symbol search, knowledge bundles)
• Kubernetes, AWS AppSync, and EventBridge
• Playwright/Cucumber test automation
• Claude Certified Developer or Claude Certified Architect (Anthropic)

We Offer

• Care: your mental and physical health is our priority. We ensure comprehensive company-paid medical insurance and mental health programs, 5 undocumented sick-leave days per year
• Tailored education path: boost your skills and knowledge with our regular internal events (meetups, conferences, workshops), Udemy license, language courses, and company-paid certifications
• Growth environment: share your experience and level up your expertise with a community of skilled professionals, locally and globally
• Long-term employment with 20 working-days paid vacation and local bank holidays
• Flexibility: 100% remote work mode
• Opportunities: we value our specialists and always find the best options for them. Our Internal Mobility Program helps change a project if needed to help you grow, excel professionally, and fulfill your potential
• Global impact: work on large-scale projects that redefine industries with international and fast-growing clients
• Welcoming environment: feel empowered with a friendly team, open-door policy, informal atmosphere within the company, and regular team-building events

About the Company

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.

As we expand into Latin America, every Ciklumer is helping to shape our story. Collaborate with seasoned experts and make a global impact backed by two decades of industry leadership.

Explore, empower, engineer with Ciklum!

Interested already? We would love to get to know you! Submit your application. We can’t wait to see you at Ciklum.