4A tech stack
4A builds mostly with SQL, C#, 1C, JavaScript. Its stack also includes PostgreSQL, .NET, Active Directory, MS SQL. SQL is named in 4 of the 8 job postings 4A published in the last 12 months (50%). Counted by Alion from the job postings of 4A, updated Sep 26, 2026.
What programming languages does 4A use?
SQL is named in 50% of job postings at 4A, followed by C# (38%), 1C (25%), JavaScript (13%).
1C 
What frameworks and libraries does 4A use?
ASP.NET Core is named in 13% of job postings at 4A, followed by AutoGen (13%), CrewAI (13%), LangChain (13%).
ASP.NET Core
1 13%
AutoGen
1 13%
CrewAI
1 13%
LangChain
1 13%
LangGraph
1 13%
LlamaIndex
1 13%
pgvector
1 13%
What databases does 4A use?
PostgreSQL is named in 50% of job postings at 4A, followed by MS SQL (13%), Qdrant (13%), Weaviate (13%).
What cloud and platforms does 4A use?
.NET is named in 25% of job postings at 4A, followed by Active Directory (13%), Anthropic (13%), Kubernetes (13%).
.NET
2 25%
Kubernetes
1 13%
MLFlow
1 13%
Ollama
1 13%
Show all (12)
What developer tools does 4A use?
Docker is named in 13% of job postings at 4A, followed by Kaspersky (13%), Swagger (13%), ViPNet (13%).
What AI and ML technologies does 4A use?
LLM is named in 13% of job postings at 4A, followed by VLM (13%).
Which engineering practices does 4A ask for?
CI/CD is named in 38% of job postings at 4A, followed by DHCP (13%), DNS (13%), LLM Guardrails (13%).
How does your stack fit 4A?
How modern is the 4A stack?
4A scores 85 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: 2; legacy ones: 0.
Questions about the 4A tech stack
What programming languages does 4A use?
The languages named in 4A job postings are SQL (50%), C# (38%), 1C (25%), JavaScript (13%), Python (13%), as a share of the 8 postings of the last 12 months.
Does 4A use .NET?
Yes. .NET is named in 2 of 8 job postings (25%) 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), Active Directory (1), Anthropic (1) (postings in brackets).
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 85 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: 2; 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 8 postings of the last 12 months and were updated on Sep 26, 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: 42 technologies from 8 job postings", as of Sep 26, 2026. https://alion.io/company/4a/technologies