Jakub Song - Full-Stack Engineer

Q: Where is Jakub based?

Jakub is based in Lublin, Poland .

Q: What languages does Jakub speak?

Jakub speaks the following languages: English (Advanced), Polish (Intermediate) .

Q: How many years of experience does Jakub have?

Jakub has at least 11 years of experience. During this time, Jakub has worked in at least 4 different roles and for 4 different companies . The average length of individual experience is 3 years and 10 months . Note that Jakub may not have shared all experience and actually has more experience.

Q: What is Jakub's latest experience?

Jakub's most recent position is Full-Stack Engineer at Bemlo .

Q: What companies has Jakub worked for in recent years?

In recent years, Jakub has worked for Bemlo , Ambience Healthcare , and Wunderdog .

Q: Which industries is Jakub most experienced in?

Jakub is most experienced in industries like Information Technology , Healthcare , and Banking and Finance . Jakub also has some experience in Transportation .

Q: Which business areas is Jakub most experienced in?

Jakub is most experienced in business areas like Information Technology , Product Development , and Business Intelligence .

Q: Which industries has Jakub worked in recently?

Jakub has recently worked in industries like Healthcare , Banking and Finance , and Information Technology .

Q: Which business areas has Jakub worked in recently?

Jakub has recently worked in business areas like Information Technology and Product Development .

Recommended expert

Lublin, Poland

Experience

Jan 2023 - Present

3 years 3 months

Full-Stack Engineer

Bemlo

Built and maintained advanced scheduling, staffing-pool, and worker availability features using React + TypeScript, focusing on complex UI logic, calendar-heavy views, and real-time state updates. These improvements reduced time spent by healthcare managers coordinating shifts and increased adoption among large hospital units.
Designed efficient PostgreSQL schemas for worker preferences, staffing rules, labor law constraints, and unit-level coverage metrics. The new structure enabled dramatically faster lookups during scheduling operations and reduced overall query cost in heavy-load scenarios.
Developed a distributed scheduling engine using Node.js, orchestrated with Redis queues, supporting parallel execution of rule checks, constraint evaluation, and conflict resolution across thousands of workers. This architecture improved generation speed by nearly 10× compared to the previous implementation.
Implemented SSO (Azure AD), role-based access control, and detailed audit logging across all employer-facing modules, ensuring compliance with regional healthcare security requirements and simplifying onboarding for large organizations.
Built real-time dashboards using WebSockets / pub-sub for conflict detection, coverage insights, and shift alerts. These updates enabled managers to respond to staffing gaps in minutes instead of hours.
Deployed microservices using Docker + AWS ECS and automated the entire CI/CD lifecycle with GitHub Actions, improving release frequency and lowering deployment risk during critical scheduling periods.
Created developer tools and observability dashboards that made debugging rule failures and schedule conflicts significantly easier for the engineering team.

Jan 2021 - Dec 2022

2 years

Software Engineer

Ambience Healthcare

Delivered major clinical workflow features using React + TypeScript, building complex UI flows for real-time transcription, chart review, and note editing. Focused on lowering cognitive load for clinicians and reducing manual documentation tasks.
Integrated ML/NLP inference pipelines into backend workflows using Node.js, enabling real-time speech-to-text, summarization, and auto-generated structured data. Improved stability and latency for inference-heavy endpoints supporting medical visits.
Designed and implemented GraphQL + REST APIs for clinical sessions, encounters, transcription processing, provider workspaces, and note management, ensuring consistent data flow between frontend, backend, and ML services.
improved frontend performance by revamping state architecture with React Query, reducing unnecessary re-renders, stabilizing long forms, and improving perceived responsiveness during live transcription.
Built secure data storage flows using PostgreSQL, encrypted fields, and RBAC-based access control to ensure HIPAA compliance. Worked closely with internal compliance teams to meet stringent healthcare data retention rules.
Automated releases and environment scaling using Docker + GitHub Actions, supporting fast iteration cycles during customer trials and clinician onboarding.
Collaborated with ML engineers to fine-tune model interfaces, optimize cold-start times, and improve reliability during high-load periods such as clinic peak hours.

Jan 2018 - Dec 2021

4 years

Full-Stack Developer

Wunderdog

Led development of full-stack features using React, Next.js, Node.js, FastAPI, working closely with client teams to deliver reliable user-facing experiences under tight project timelines. Focused on robust UI design, maintainable code, and predictable performance.
Designed and implemented backend workflows, reporting dashboards, and automation tools across fintech and logistics systems. Leveraged PostgreSQL and MongoDB to optimize complex data relationships and reduce query overhead.
Built secure identity and access flows using OAuth2, JWT, and RBAC, including multi-tenant support for enterprise clients with strict permission requirements.
Integrated third-party services such as Stripe (payments), Mapbox (maps and routing), and internal analytics systems, ensuring smooth data flow and high uptime.
Implemented CI/CD pipelines using Docker + GitHub Actions, introducing automated testing, artifact packaging, and multi-environment deploys that significantly accelerated release cycles.
Worked directly with stakeholders to define architecture choices, prioritize features, scope MVPs, and transform requirements into technical plans. Helped teams avoid over-engineering by choosing simple, scalable patterns.
Led debugging and optimization work on production systems, resolving performance bottlenecks, reducing response times, and improving reliability for users across Europe.

Jan 2015 - Dec 2018

4 years

Junior Software Developer

Microsoft

Built backend automation and orchestration tools using C#/.NET, enabling engineering teams to streamline deployment tracking, reporting, and workflow management. Focused on reliability, error handling, and high uptime.
Developed interactive dashboards and internal UI components using JavaScript + enterprise UI frameworks, making large datasets more accessible to technical and non-technical stakeholders.
Designed SQL Server queries, ETL pipelines, and API integrations for large engineering datasets, reducing latency and improving the accuracy of internal KPIs and metrics.
Improved job performance and processing speed by refactoring service flows, optimizing I/O patterns, and redesigning long-running automation tasks.
Implemented full test coverage using xUnit + MSTest, improving reliability of services deployed across multiple engineering teams.
Integrated internal messaging, authentication, logging, and monitoring services to ensure compliance with Microsoft’s enterprise security standards.
Collaborated with teams across multiple time zones, aligning roadmap decisions and delivering features under strict security and performance constraints.

Industry Experience

See where this freelancer has spent most of their professional time.

Experienced in Information Technology, Healthcare, Banking and Finance, and Transportation.

Information Technology

Healthcare

Banking and Finance

Transportation

Business Area Experience

See which departments and functions this freelancer has contributed to most.

Experienced in Information Technology, Product Development, and Business Intelligence.

Information Technology

Product Development

Business Intelligence

Summary

Full-Stack Software Engineer with 9+ years of experience building AI-driven healthcare products, automated scheduling engines, and high-scale SaaS platforms. Strong across the full stack with React, TypeScript, Node.js, Python, PostgreSQL, Redis, Docker, and AWS, delivering features end-to-end from design to production. Hands-on experience integrating NLP/ML pipelines, real-time transcription, AI-generated clinical notes, and rule-based decision systems into production environments. Skilled at designing clean architecture, optimizing performance under heavy workloads, and building secure data flows for regulated industries. Focused on creating fast, reliable user experiences while scaling backend systems that support complex AI workflows and high-demand operational tooling.

Skills

Frontend

Styled Components
React
Mui
React Query
Tailwind
Next.js
Typescript
Redux

Backend

Unix
Python
Django
Fastapi
Node.js
Nestjs
Express
Go
Rest Apis
Graphql
Websockets

Cloud & Infrastructure

Aws Lambda
Aws Ecs
Aws Sqs
Aws Sns
Aws Dynamodb
Aws S3
Aws Api Gateway
Aws Step Functions
Aws Cloudwatch
Docker
Terraform
Kubernetes

Databases

Postgresql
Mysql
Mongodb
Dynamodb
Redis
Data Modeling
Query Optimization

Devops

Github Actions
Circleci
Ci/cd
Observability
Monitoring & Alerts
Performance Profiling

Others

Stripe
Nlp/ml Apis
Openai
Mapbox

Languages

English

Advanced

Polish

Intermediate

Education

Oct 2010 - Jun 2015

AGH University of Krakow

Bachelor of Science, Computer Science · Computer Science · Kraków, Poland

Statistics

Experience

Total positions 4

Experience in Information Technology 7 y

Avg length 3 y 3 m

Longest experience 3 y 11 m

Expertise

Recent roles Full-Stack Engineer, Software Engineer, Full-Stack Developer

Main industries Information Technology, Healthcare, Banking and Finance

Main business areas Information Technology, Product Development, Business Intelligence

Qualifications

Highest degree Bachelor

Profile

Created

December 2025

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Frequently asked questions

Do you have questions? Here you can find further information.

Where is Jakub based?

Jakub is based in Lublin, Poland.

What languages does Jakub speak?

Jakub speaks the following languages: English (Advanced), Polish (Intermediate).

How many years of experience does Jakub have?

Jakub has at least 11 years of experience. During this time, Jakub has worked in at least 4 different roles and for 4 different companies. The average length of individual experience is 3 years and 10 months. Note that Jakub may not have shared all experience and actually has more experience.

What roles would Jakub be best suited for?

Based on recent experience, Jakub would be well-suited for roles such as: Full-Stack Engineer, Software Engineer, Full-Stack Developer.

What is Jakub's latest experience?

Jakub's most recent position is Full-Stack Engineer at Bemlo.

What companies has Jakub worked for in recent years?

In recent years, Jakub has worked for Bemlo, Ambience Healthcare, and Wunderdog.

Which industries is Jakub most experienced in?

Jakub is most experienced in industries like Information Technology, Healthcare, and Banking and Finance. Jakub also has some experience in Transportation.

Which business areas is Jakub most experienced in?

Jakub is most experienced in business areas like Information Technology, Product Development, and Business Intelligence.

Which industries has Jakub worked in recently?

Jakub has recently worked in industries like Healthcare, Banking and Finance, and Information Technology.

Which business areas has Jakub worked in recently?

Jakub has recently worked in business areas like Information Technology and Product Development.

What is Jakub's education?

Jakub holds a Bachelor in Computer Science from AGH University of Krakow.

What is the availability of Jakub?

Jakub is immediately available full-time for suitable projects.

What is the rate of Jakub?

Jakub's rate depends on the specific project requirements. Please use the Meet button on the profile to schedule a meeting and discuss the details.