Senior Full-Stack Engineer (Data-Aware)

Sunscrapers is a technology consultancy that empowers finance and healthcare leaders to succeed by leveraging cutting-edge software, data, and AI.

We combine world-class engineering, deep industry expertise, and proprietary know-how to deliver innovative, high-impact solutions. Specializing in software engineering, DevOps, data engineering, and data science, we design and build AI-powered data platforms and web applications tailored to each client’s unique needs.

Trusted by over 60 clients across the US, UK, and beyond, we consistently maintain a 4.9/5 client satisfaction rating, with partnerships averaging five years or more.

The project:

We are carrying out the project for our client, an American private equity and investment management fund - listed on the Forbes 500 list - based in New York.

We support them in the area of the infrastructure and data platform, and very recently we also build and experiment with Gen AI applications. The client operates very widely in the world of finance, loans, investments and real estate.

As a Senior Full-Stack Engineer (Data-Aware) you'll design and implement core systems that enable data science, data visualization, and agent-based applications at companies that implement data-driven decision processes to create a competitive advantage.

You'll build internal agent-based tooling and data platform interfaces for data and business teams, including authenticated frontend applications, backend services, and data integrations, using:

Technologies: Python, Next.js, React, FastAPI, Terraform, SQL, Pandas
Tools: git, Docker, Snowflake, Pinecone, Neo4j, OpenAI API, Apache Airflow / Astronomer, Kubernetes, Artifactory, Linux
AWS: EC2, ECS, ELB, IAM, RDS, Route53, S3, VPCs
Best Practices: Continuous Integration, Code Reviews, OAuth2/OIDC authentication, observability

The ideal candidate will be well organized, eager to constantly improve and learn, driven and, most of all - a team player!

Your responsibilities will include:

• Owning and evolving Next.js/React frontend with authenticated flows and secure session handling
• Designing and implementing secure, scalable access patterns (OAuth2/OIDC, authorization boundaries)
• Building and maintaining FastAPI backend services for agent-driven workflows and data integrations
• Developing PoCs using latest technologies, experimenting with third party integrations
• Delivering production grade applications once PoCs are validated
• Creating solutions that enable data scientists and business analysts to be self-sufficient as much as possible
• Finding new ways how to leverage Gen AI applications and underlying vector and graph data storages
• Working with data warehouses, databases, and building data flows for fetching and aggregation
• Contributing to infrastructure-as-code and AWS-based systems
• Documenting design decisions before implementation

Requirements:
What's important for us?

• At least 5+ years of professional experience as a software engineer (backend/full-stack)
• Undergraduate or graduate degree in Computer Science, Engineering, Mathematics, or similar
• Strong proficiency in Next.js / React for frontend development
• Solid backend development skills in Python (FastAPI, Flask, or Django)
• Experience working with data in any capacity - SQL databases, data processing, analytics, working alongside data teams, or building data-driven applications
• Proven experience building secure, scalable web applications
• Experience with AWS stack and services, proficiency in using Docker
• Experience with infrastructure-as-code tools, like Terraform
• Excellent command in spoken and written English, at least C1
• Creative problem-solving skills and excellent technical documentation

You will score extra points for:

• Knowledge of OAuth2/OIDC flows, PKCE, token/session handling
• Agent frameworks experience (OpenAI Agents, Agno, Strands) or MCP-style integrations
• Observability stacks experience (OpenTelemetry or similar)
• AWS ECS, VPCs, and secure networking patterns
• Experience with integrating LLMs (OpenAI but also others, maybe open source)
• Experience with data warehouses (Snowflake) or different database technologies (vector DBs, graph DBs)
• Understanding of LLMs fine tuning, embedding and vector semantic searching
• Experience with Pinecone or Neo4j
• Experience in building ETL processes and data pipelines with platforms like Airflow
• Proficiency in data manipulation with Python libraries (Pandas, NumPy)
• Experience in working with repository manager, for example Jfrog Artifactory

Benefits:
What do we offer?

• Working alongside a talented team of software engineers who are changing the image of Poland abroad
• Culture of teamwork, professional development and knowledge sharing (https://www.youtube.com/user/sunscraperscom)
• Flexible working hours and remote work possibility
• Comfortable office in central Warsaw, equipped with all the necessary tools for conquering the universe (Macbook Pro/Dell, external screen, ergonomic chairs)

Sounds like a perfect place for you? Don’t hesitate to click apply and submit your application today!