Senior Backend Developer
Primary stack
Nice to have's
Job description
Senior Backend Developer
Location: Remote or Wroclaw, Poland
Employment Type: Full-time
About the Position
We are seeking a Senior Backend Developer to grow the backend and the workflow engine behind Workflow Builder, and to take the product into customer environments. You will own modules end to end, from design through deployment to production support.
About this Job Opening
We build Workflow Builder, our product for designing and running processes visually. It gives automation platforms a workflow editor on the front end and a durable execution engine underneath.
You will grow that backend and workflow engine, deploy the product at customers, and connect it to their systems.
This is a hands-on senior role with a short path from decision to production.
Responsibilities
- Develop the product backend, the API, and the mechanics that execute workflow graphs.
- Build and grow integrations with external systems.
- Run customer deployments and connect the product to customer systems.
- Scale workers and improve the performance and reliability of running processes.
- Design modules, write tests, diagnose production issues, and review code.
Requirements
Must have:
- Strong TypeScript and Node.js, with production experience building backends.
- Production experience with Temporal or another durable execution engine, and readiness to work with Temporal.
- A clear grasp of determinism and replay, retries, durable timers, and resumptions. You can safely change code that handles processes already in flight.
- Idempotency, deduplication, partial failure handling, and compensation. You understand dependencies between steps and parallel workflow branches.
- Designing and shipping systems that scale. Horizontal scaling of workers in Temporal or a similar engine, concurrency control, and removing bottlenecks.
- PostgreSQL at high data volumes: query tuning, indexes, partitioning, transactions, and migrations.
- Hands-on work with Redis or similar systems, including cache, TTL, invalidation, and data consistency.
- Deploying and running applications on Azure or AWS. You know one of them and are ready to work in the other.
- REST APIs, webhooks, and SSE (server-sent events). Authentication, permissions, customer data isolation, and secrets management.
- Docker, CI/CD, integration and load tests, monitoring, and failure diagnosis.
- Experience working with AI agents on implementation, tests, or code analysis. You review their changes and want to keep working this way.
- English at C1 level.
Nice to have:
- React and React Flow.
- Temporal TypeScript SDK.
- Kubernetes, Terraform, and OpenTelemetry.
How We Operate
- You run tasks on your own, from design through deployment to maintenance.
- You agree on requirements with the customer and the team. You flag risks and blockers, and bring solutions with them.
- You share knowledge, take part in code reviews, and act on feedback.
- You discuss technical solutions with customers in English.
Work Model
Work model: remote or hybrid. Our office is in Wroclaw if you like working on site.
Apply Now
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Curious About the Interview?
The conversation lasts about 2 hours. It is a bit long, but we don’t have more interviews, follow-ups, or homework assignments. We try to ensure a friendly, informal atmosphere to reduce stress. You don’t need to worry.
Got any questions?
Ready to Join the #Squad?
At Synergy Codes, you’ll work on cutting-edge solutions, collaborate with top experts, and grow in a culture that values your creativity and innovation.
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IT,Manufacturing & Engineering,Business Intelligence,Healthcare,IoT
About the Company Synergy Codes specializes in turning complex data and processes into understandable interfaces, delivering diagram and workflow products to teams worldwide since 2011. Products, Services & Tech Stack Core Solutions Data visualization agency for data products AI-powered diagram transformation for modern workflows Entity data visualization solution for managing corporate relationships Custom Workflow Builder for AI automation Schematic editor for OPAL-RT to build electrical circuits Chatbot’s redesign to improve user experience Custom AV design software with interactive floor plans RCS campaign builder with production-ready workflow editor Custom diagram interface with tldraw: Real-time and scalable Building no-code AI agent training tool with React Flow A no-code, drag-and-drop solution for visualizing and mapping complex service flows Optimizing diagram performance for global insurance sector Transforming legal entity diagrams for better performance and clarity Industrial IoT dashboards to enable smart manufacturing Visualizing the IoT sensors data on hydroponic farm Product configurator for automotive company Graph database use cases Enterprise OKR dashboard for reaching the company’s goals Process and data mining visualization Digitised passenger flow for airport infrastructure The healthcare data visualization tool to aggregate patient’s records Transforming paperwork into interactive assembly manuals Cyber security architecture diagram with threats simulation Technologies & Frameworks GoJS React Typescript Redux GraphQL Node.js Vue.js React Flow Dashboard UX&UI design Real-time solutions Conversational AI IoT Data Management Business intelligence Manufacturing & engineering Diagrams Flowchart Modeling Smart manufacturing Hydroponic farm Automotive industry Knowledge graph OKR dashboard Data analysis Airport infrastructure Patient records Assembly manuals Cyber security architecture Process flow diagram Project Scope & Target Clients Client Base Startups Established SaaS businesses Fortune 500 companies Engineering Scale Bespoke data visualizations Custom diagramming tools Workflow automation solutions Interactive floor plans RCS campaign builders No-code AI platform MVPs Drag-and-drop flow builders IoT dashboards Hydroponic farm visualization tools Automotive product configurators Knowledge graph implementations OKR dashboards Data analysis visualizations Airport infrastructure flow simulations Patient records aggregation tools Interactive assembly manuals Cyber security architecture diagrams Process flow diagrams