Blue J tech stack
Blue J builds mostly with Node JS, TypeScript, JavaScript, Python. Its stack also includes AWS, Apache Kafka, ElasticSearch, Pinecone. Node JS is named in 6 of the 11 job postings Blue J published in the last 12 months (55%). Counted by Alion from the job postings of Blue J, updated Oct 5, 2026.
What programming languages does Blue J use?
Node JS is named in 55% of job postings at Blue J, followed by TypeScript (55%), JavaScript (55%), Python (45%).
What frameworks and libraries does Blue J use?
React.js is named in 27% of job postings at Blue J, followed by LangChain (9%), OpenAI Agents SDK (9%), PyTorch (9%).
What databases does Blue J use?
ElasticSearch is named in 55% of job postings at Blue J, followed by Pinecone (55%), PostgreSQL (55%).
What cloud and platforms does Blue J use?
AWS is named in 55% of job postings at Blue J, followed by Apache Kafka (55%), Kubernetes (55%), Datadog (36%).
AWS
6 55%
Apache Kafka
6 55%
Kubernetes
6 55%
Datadog
4 36%
GCP
2 18%
GitHub
2 18%
Show all (15)
What developer tools does Blue J use?
Docker is named in 45% of job postings at Blue J, followed by ArgoCD (18%), Terraform (18%), CircleCI (9%).
Which engineering practices does Blue J ask for?
AI Agents is named in 27% of job postings at Blue J, followed by CI/CD (18%), Machine Learning (18%), NLP (9%).
AI Agents
3 27%
CI/CD
2 18%
NLP
1 9%
Prompt Engineering
1 9%
RAG
1 9%
What does each Blue J team work with?
The technologies each team's postings require most often, with the number of postings that require them.
Backend
5 postingsHow does your stack fit Blue J?
How is the Blue J stack changing?
Read from the dates of the postings themselves: a technology is new when the first posting that names it appeared in the last six months, rising or falling when its share of postings moved between the last two quarters.
How modern is the Blue J stack?
Blue J scores 77 out of 100 (Cutting-edge). The score averages how current each technology in the stack is and adds weight for AI adoption. AI technologies in the stack: 0; legacy ones: 0.
How common is the Blue J stack in its industry?
Share of the 511 companies in the same industries, whose stack Alion knows, that use each technology.
What sets Blue J apart
Companies with a stack like Blue J
Questions about the Blue J tech stack
What programming languages does Blue J use?
The languages named in Blue J job postings are Node JS (55%), TypeScript (55%), JavaScript (55%), Python (45%), Go (18%), as a share of the 11 postings of the last 12 months.
Does Blue J use React.js?
Yes. React.js is named in 3 of 11 job postings (27%) and required in 3 of them.
What cloud and platforms does Blue J use?
The cloud and platforms named in Blue J job postings are AWS (6), Apache Kafka (6), Kubernetes (6) (postings in brackets).
What skills do you need for a Backend job at Blue J?
Backend postings at Blue J most often require AWS (5), Apache Kafka (5), ElasticSearch (5), Kubernetes (5), out of 5 postings in the last 12 months.
Is the Blue J tech stack changing?
Yes. Figma, Amazon S3, ArgoCD, CI/CD first appeared in Blue J job postings in the last six months.
How modern is the Blue J tech stack?
Blue J scores 77 out of 100 (Cutting-edge). The score averages how current each technology in the stack is and adds weight for AI adoption. AI technologies in the stack: 0; legacy ones: 0.
How does Alion know the Blue J tech stack?
Alion reads every job posting Blue J publishes and tags the technologies each one names. The figures on this page count the 11 postings of the last 12 months and were updated on Oct 5, 2026.
Method and citation
Alion reads every job posting the company publishes and tags the technologies each one names. Shares count the postings of the last 12 months, open and closed; the company's own products are counted apart. How we count
Alion, "Blue J tech stack: 44 technologies from 11 job postings", as of Oct 5, 2026. https://alion.io/company/blue-j/technologies