4A tech stack
4A builds mostly with SQL, C#, 1C, Python. Its stack also includes PostgreSQL, .NET, Kubernetes, Qdrant. PostgreSQL is named in 5 of the 12 job postings 4A published in the last 12 months (42%). Counted by Alion from the job postings of 4A, updated Nov 11, 2026.
What programming languages does 4A use?
SQL is named in 33% of job postings at 4A, followed by C# (33%), 1C (17%), Python (17%).
1C 
What frameworks and libraries does 4A use?
pgvector is named in 17% of job postings at 4A, followed by ASP.NET Core (8%), Asyncio (8%), AutoGen (8%).
pgvector
2 17%
ASP.NET Core
1 8%
Asyncio
1 8%
AutoGen
1 8%
Celery
1 8%
CrewAI
1 8%
FastAPI
1 8%
LangChain
1 8%
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What databases does 4A use?
PostgreSQL is named in 42% of job postings at 4A, followed by Qdrant (17%), MS SQL (8%), OpenSearch (8%).
What cloud and platforms does 4A use?
.NET is named in 17% of job postings at 4A, followed by Kubernetes (17%), OpenAI (17%), Active Directory (8%).
.NET
2 17%
Kubernetes
2 17%
Apache Kafka
1 8%
MLFlow
1 8%
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What developer tools does 4A use?
Docker is named in 17% of job postings at 4A, followed by Kaspersky (8%), Rest API (8%), Swagger (8%).
What AI and ML technologies does 4A use?
LLM is named in 17% of job postings at 4A, followed by GigaChat (8%), VLM (8%), YandexGPT (8%).
Which engineering practices does 4A ask for?
CI/CD is named in 58% of job postings at 4A, followed by RAG (17%), AI Agents (8%), DHCP (8%).
What does each 4A team work with?
The technologies each team's postings require most often, with the number of postings that require them.
Leadership
3 postingsHow does your stack fit 4A?
How modern is the 4A stack?
4A scores 89 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: 4; legacy ones: 0.
How common is the 4A stack in its industry?
Share of the 7,145 companies in the same industries, whose stack Alion knows, that use each technology.
Companies with a stack like 4A
Questions about the 4A tech stack
What programming languages does 4A use?
The languages named in 4A job postings are SQL (33%), C# (33%), 1C (17%), Python (17%), JavaScript (8%), as a share of the 12 postings of the last 12 months.
Does 4A use pgvector?
Yes. pgvector is named in 2 of 12 job postings (17%) and required in 2 of them.
What cloud and platforms does 4A use?
The cloud and platforms named in 4A job postings are .NET (2), Kubernetes (2), OpenAI (2) (postings in brackets).
What skills do you need for a Leadership job at 4A?
Leadership postings at 4A most often require .NET (2), C# (2), PostgreSQL (2), SQL (2), out of 3 postings in the last 12 months.
Is the 4A tech stack changing?
No new technology has appeared in 4A job postings in the last six months.
How modern is the 4A tech stack?
4A scores 89 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: 4; legacy ones: 0.
How does Alion know the 4A tech stack?
Alion reads every job posting 4A publishes and tags the technologies each one names. The figures on this page count the 12 postings of the last 12 months and were updated on Nov 11, 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, "4A tech stack: 54 technologies from 12 job postings", as of Nov 11, 2026. https://alion.io/company/4a/technologies