Toss tech stack
Toss builds mostly with Python, SQL, Java, Kotlin. Its stack also includes Kubernetes, Apache Kafka, MySQL, ElasticSearch. Python is named in 36 of the 127 job postings Toss published in the last 12 months (28%). Counted by Alion from the job postings of Toss, updated Nov 12, 2026.
What programming languages does Toss use?
Python is named in 28% of job postings at Toss, followed by SQL (24%), Java (9%), Kotlin (9%).
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What frameworks and libraries does Toss use?
Hadoop is named in 5% of job postings at Toss, followed by Spring Boot (5%), Hibernate (4%), Flink (3%).
Hadoop
6 5%
Spring Boot
6 5%
Hibernate
5 4%
Flink
4 3%
Spring Cloud
4 3%
FastAPI
2 2%
Jotai
2 2%
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And 1 more, each named in fewer postings.
What databases does Toss use?
MySQL is named in 9% of job postings at Toss, followed by ElasticSearch (8%), Redis (8%), ClickHouse (6%).
MySQL
11 9%
ElasticSearch
10 8%
Redis
10 8%
ClickHouse
7 6%
Milvus
4 3%
Neo4j
2 2%
Snowflake
2 2%
StarRocks
2 2%
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What cloud and platforms does Toss use?
Kubernetes is named in 22% of job postings at Toss, followed by Apache Kafka (13%), Grafana (9%), AWS (7%).
Kubernetes
28 22%
Apache Kafka
17 13%
Grafana
12 9%
AWS
9 7%
Spark
8 6%
GitHub
7 6%
Istio
7 6%
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What developer tools does Toss use?
Prometheus is named in 9% of job postings at Toss, followed by ArgoCD (6%), Terraform (6%), Thanos (6%).
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And 13 more, each named in fewer postings.
What AI and ML technologies does Toss use?
LLM is named in 24% of job postings at Toss, followed by VLM (2%), LoRA (1%), PEFT (1%).
Which engineering practices does Toss ask for?
CI/CD is named in 8% of job postings at Toss, followed by Red Teaming (8%), Platform Engineering (7%), RAG (6%).
CI/CD
10 8%
Platform Engineering
9 7%
RAG
8 6%
AI Agents
5 4%
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What other technologies does Toss use?
Swift Concurrency is named in 1% of job postings at Toss.
Swift Concurrency
1 1%
What does each Toss team work with?
The technologies each team's postings require most often, with the number of postings that require them.
AI/ML
19 postingsSecurity
19 postingsDevOps
15 postingsData Science
11 postingsAnalytics
8 postingsProduct
8 postingsHow does your stack fit Toss?
How is the Toss 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 Toss stack?
Toss scores 80 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 Toss stack in its industry?
Share of the 1,093 companies in the same industries, whose stack Alion knows, that use each technology.
What sets Toss apart
Companies with a stack like Toss
Questions about the Toss tech stack
What programming languages does Toss use?
The languages named in Toss job postings are Python (28%), SQL (24%), Java (9%), Kotlin (9%), TypeScript (2%), as a share of the 127 postings of the last 12 months.
Does Toss use Hadoop?
Yes. Hadoop is named in 6 of 127 job postings (5%) and required in 6 of them.
What cloud and platforms does Toss use?
The cloud and platforms named in Toss job postings are Kubernetes (28), Apache Kafka (17), Grafana (12) (postings in brackets).
What skills do you need for a AI/ML job at Toss?
AI/ML postings at Toss most often require LLM (11), Triton (4), ElasticSearch (3), Milvus (3), out of 19 postings in the last 12 months.
Is the Toss tech stack changing?
Yes. Falco, Wazuh, OCR, Cilium first appeared in Toss job postings in the last six months.
How modern is the Toss tech stack?
Toss scores 80 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 Toss tech stack?
Alion reads every job posting Toss publishes and tags the technologies each one names. The figures on this page count the 127 postings of the last 12 months and were updated on Nov 12, 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, "Toss tech stack: 195 technologies from 127 job postings", as of Nov 12, 2026. https://alion.io/company/viva-republica/technologies