Kapil Soni

Backend & Platform Engineer · Go, Kubernetes, Kafka

Montréal, Canada developer.kapil333@gmail.com +1 263-880-5015 github.com/kapildev333 linkedin.com/in/devkapil333

Summary

Backend and platform engineer with five years building services in Go, Java and TypeScript. At Lightspeed I work on an X-Series sales-creation endpoint handling 28M+ requests a week, with Kafka moving work off the synchronous path and canary, feature-flag and shadow deployments behind Datadog SLOs. The part I'm proudest of is that it is boring to run: clear monitoring, safe rollouts, and a team that ships without worrying about it. Looking for a backend or platform role in Montréal or remote; also available for fixed-scope contract engagements.

Experience

Software Developer, Lightspeed Commerce

2025 – present

Montréal, QC · joined as an intern in 2025, full-time since 2026

Optimised a high-traffic X-Series sales-creation endpoint (28M+ weekly requests) with stronger monitoring, alerting and production-readiness practices.
Built time-versioned APIs and backend services in Go with PostgreSQL, Redis, gRPC, GraphQL and Protobuf; added Kafka event processing to move work off synchronous request paths.
Shipped safely with canary, feature-flag and shadow deployments backed by Datadog SLOs.
Helped resolve 5 Sev-0 and 3 Sev-1 incidents and cut incident investigation time by 25%.

Software Developer Intern, OneSpan

May – Aug 2024

Montréal, QC

Enhanced the Java Mobile Security Suite used by banking apps: secure REST integrations with OAuth 2.0, JWT, TLS 1.3 and mutual certificate validation.
Built React document-signing and verification workflows, including digital-signature validation and real-time camera checks for in-branch authentication.

Software Developer, Bacancy

2021 – 2024

Ahmedabad, India

Delivered full-stack products for clients: Go microservices with clean API boundaries and goroutine-based concurrency; React/TypeScript front-ends with Redux and code-splitting.
Ran workloads on Kubernetes with ArgoCD; built AWS infrastructure on RDS, Aurora, SQS, SNS and S3; tuned PostgreSQL and MySQL schemas and indexes.
Improved delivery with reusable Dockerfiles, Jenkins pipelines and Git-based CI/CD that cut manual release effort.

How I work

Start in production. Dashboards, incident history and the deploy pipeline before opinions. What breaks shows where to spend your money.
Ship in safe slices. Feature flags, canaries and shadow traffic. Every change is small enough to roll back in a minute.
Leave the team stronger. Runbooks, alerts and tests stay with you, so you don't need me on call after the engagement ends.

Freelance Projects

Client engagements owned end to end, from design through deployment.

Catalog Semantic Search (e-commerce)Go · PostgreSQL · pgvector · OpenSearch · React

Embeds product text and images so a natural-language query or an uploaded photo returns matching SKUs with price filters; hybrid keyword and vector ranking with a React storefront demo.

Order Support Assistant (e-commerce)Go · gRPC · PostgreSQL · Redis · React

Chat assistant for order status and returns that answers only from live order, fulfillment and inventory APIs through a typed tool layer, with guardrails, human hand-off and an audit log of every call.

Content Moderation Pipeline (social)Go · Kafka · PostgreSQL · Kubernetes · React

Kafka-fed pipeline that classifies posts and images, routes low-confidence items to a human review queue with appeals and audit logs, and reports queue depth and decision latency to Prometheus.

Fraud and Chargeback Scoring (payments)Go · Kafka · Redis · Prometheus · Grafana

Scores checkout events in real time by combining a rules engine with model-based review of ambiguous cases, publishing decisions back to Kafka and tracking throughput and false positives in Grafana.

Skills

Languages & UI: Go, Java, TypeScript, JavaScript, SQL, React, Redux, Jest
Backend & data: Go/Gin, Spring Boot, REST, gRPC, GraphQL, Protobuf, PostgreSQL, MySQL, Redis, Kafka, SQS/SNS, OpenSearch

Cloud & ops: AWS (RDS, Aurora, SQS, SNS, S3), Docker, Kubernetes, ArgoCD, Jenkins, GitHub/GitLab CI, Datadog, Prometheus, Grafana, SLOs, canary and shadow deployments

Education

M.Eng. Software Engineering, Concordia University

2024 – 2025

Montréal, Canada

B.E. Information Technology, Gujarat Technological University

2017 – 2021

Contract availability

Alongside full-time work I take fixed-scope engagements: a one-week readiness audit, a two-to- four-week hardening sprint on the top items it surfaces, or joining a team as an extra senior backend engineer to ship a feature. Fixed price, clear scope, and everything I build stays with the team.

Beyond engineering

YouTube and content creation. Writes, shoots and edits a channel end to end. The same habit of explaining a system clearly that makes runbooks and design docs land.
Photography. Street and portrait work around Montréal. Composition, light, and a lot of practice deciding what to leave out.
Cooking. Gujarati home cooking and whatever Montréal has taught since.