You will get upgraded email security with SPF, DKIM, DMARC, TLS, MTA-STS and BIMI
Project details
Ensure your email communication is safe and secure with my expert audit and compliance services. I will scan and audit your domain for specific flaws in:
• SPF is a DNS-based authentication protocol that allows a domain owner to specify which mail servers are authorized to send email on its behalf.
• DKIM is a method for digitally signing email messages at the server level before they are sent.
DMARC helps organizations combat email spoofing, phishing attacks, and unauthorized use of their domain in email communications.
• TLS Encryption ensures that the email content is protected from eavesdropping and tampering during transit by transmitting it over an encrypted TLS connection.
• MTA-STS aims to protect against certain types of attacks, such as man-in-the-middle attacks, that can compromise the confidentiality and integrity of email messages.
• BIMI is an email authentication initiative designed to improve email deliverability and trustworthiness of emails by displaying brand logos in email recipients' inboxes.
• DMARC&TLS reports focus on the security of email transmission and provide statistical data about the volume of emails that have passed or failed validation
• SPF is a DNS-based authentication protocol that allows a domain owner to specify which mail servers are authorized to send email on its behalf.
• DKIM is a method for digitally signing email messages at the server level before they are sent.
DMARC helps organizations combat email spoofing, phishing attacks, and unauthorized use of their domain in email communications.
• TLS Encryption ensures that the email content is protected from eavesdropping and tampering during transit by transmitting it over an encrypted TLS connection.
• MTA-STS aims to protect against certain types of attacks, such as man-in-the-middle attacks, that can compromise the confidentiality and integrity of email messages.
• BIMI is an email authentication initiative designed to improve email deliverability and trustworthiness of emails by displaying brand logos in email recipients' inboxes.
• DMARC&TLS reports focus on the security of email transmission and provide statistical data about the volume of emails that have passed or failed validation
Cybersecurity Expertise
Configuration Management, Audit, Gap AnalysisTechnology Type
Computer Network, Web Application, Email SystemWhat's included $150
These options are included with the project scope.
$150
- Delivery Time 2 days
- Cybersecurity Monitoring
- Security Analysis
- Security Patch Installation
Optional add-ons
You can add these on the next page.
Fast 1 Day Delivery
+$50
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DB
David B.
Sep 1, 2024
Creating an additional feature on existing application
Costin was re-hired to add further features to a previous application he developed for me. All were completed successfully and I will not hesitate to come back to him for future work.
LW
Liam W.
Jan 26, 2024
Sports Feed Integration Work
Costin is a top tier contractor. Excellent communicator and strong problem solving skills were applied to a complex sports feed integration for our betting project.
DB
David B.
Nov 10, 2023
Extension features - remove duplicate questions
This is the second project that was completed for me by this expert. It was successfully finished in super-quick time and to all the required specifications.
DB
David B.
Oct 11, 2023
Application to monitor and open newly-posted listings from a Lightstremer-based page
I engaged Costin to build me a Chrome extension from scratch - he followed all the requirements in detail and the end product was just as requested. Great quality work, quick turnaround and good communication. I will likely be back to engage him for further enhancements to the original job.
SW
Shaun W.
Oct 11, 2018
Expert PHP programmer for modifying and adding to existing code
We have been working with Costin for almost a year and a half. Our entire team (other developers, PMs, QA, management, etc.) have come to appreciate the robustness of his code. Costin thinks of many parameters, edge cases and scaling concerns, and brings up important questions at a early time, well before issues can arise. The quality of his work derives from his attention to detail. We have been able to communicate effectively with Costin and together push out large, complex projects in a timely fashion. When urgent modifications are required, Costin has always made himself available regardless of the hour of the day. The systems Costin has built with our team serve tens of millions of users daily, and growing. Importantly, Costin has shown professionalism and creativity when solving complicated problems. We highly recommend him!
About Costin
Senior Software Engineer | SaaS, APIs, Payments, Chrome Extensions
Bucharest, Romania - 9:32 am local time
I work directly with every client — no account managers, mediators or subcontractors. When you hire me, you work with the developer responsible for the architecture, implementation, debugging, deployment and long-term technical quality of your project.
CORE EXPERTISE
- Full-Stack & Backend Development
PHP, JavaScript, TypeScript, Node.js, Python, MySQL, MariaDB, PostgreSQL, Redis, SQL, NoSQL, REST APIs, WebSockets, event-driven systems, background processing, caching, queues, authentication, API design and scalable backend architecture.
- Modern Frontend Development
React, Next.js, TypeScript, JavaScript, HTML5, CSS, responsive interfaces, PWAs, real-time user interfaces and complex interactive web applications.
- Chrome & Browser Extensions (MV3 and MV2)
Extensive experience developing sophisticated Chrome Extensions using Manifest V3 and Manifest V2, including Chrome Extension APIs, service workers, content scripts, background scripts, messaging, permissions, storage, authentication, browser automation, side panels and complex browser integrations.
I also develop cross-browser extensions for Firefox and Chromium-based browsers.
- Sportsbook & Betting Platforms
Deep, hands-on experience building sportsbook and betting technology, including:
• Sportradar / Betradar integrations
• BetGenius integrations
• Odds feeds and odds APIs
• Pre-match and live/in-play betting
• Bet engines
• Bet settlement
• Wallet and transaction systems
• Cashout logic
• Trading and risk-management systems
• Fixtures and results feeds
• Real-time data processing
• WebSocket feeds
• Gaming APIs
• White-label sportsbook platforms
• High-performance caching
• High-traffic betting infrastructure
I have worked extensively with Sportradar, Betradar and BetGenius APIs, integrating sports data, odds, fixtures, results, live events and trading-related systems.
- Payments, Billing & SaaS
Strong experience implementing payment and subscription infrastructure using Stripe, PayPal and other payment providers, including:
• Stripe Checkout and Stripe Elements
• Subscription billing
• Usage and tier-based pricing
• Webhooks
• Recurring payments
• Tax/VAT workflows
• Customer portals
• Wallets and transaction ledgers
• SaaS billing systems
• Payment-provider API integrations
- AI & LLM Development
Experience integrating modern AI technologies into production applications, including OpenAI APIs, LLM-powered features, AI automation, structured data extraction, conversational interfaces, semantic search, embeddings, RAG workflows and AI agents.
I focus on using AI where it creates measurable product value rather than adding AI simply as a feature.
- Cloud, Infrastructure & DevOps
AWS, Docker, Linux, Nginx, Git, GitHub Actions, CI/CD, serverless architecture, AWS Lambda, API Gateway, S3, SES, Cognito, databases, caching infrastructure, deployment automation and production troubleshooting.
I am comfortable taking ownership of both application development and the infrastructure required to run it reliably.
API & INTEGRATION SPECIALIST
A large part of my work involves connecting complicated systems that were never designed to work together.
I regularly build and integrate:
• REST APIs
• OAuth and authentication systems
• Payment APIs
• Sports data APIs
• Third-party SaaS APIs
• Webhooks
• Real-time APIs
• Data synchronization pipelines
• External platform integrations
• Internal service APIs
I am particularly strong at understanding unfamiliar APIs quickly, identifying edge cases and building reliable integration layers around them.
WHAT I BRING TO A PROJECT
I am not limited to implementing tickets. I can take a product requirement, understand the business objective behind it, design the architecture and build the complete solution.
My work typically involves some combination of:
Software architecture • Full-stack development • API engineering • SaaS development • Chrome extensions • AI integrations • Sportsbook development • Payment systems • Real-time systems • Database architecture • Performance optimization • Security • Debugging • Legacy modernization • DevOps
I enjoy technically challenging projects where experience matters: complicated business logic, high-volume APIs, real-time data, payments, browser internals, performance problems and systems that need to remain maintainable as they grow.
If you need an experienced senior developer who can understand a complex system quickly, make sound architectural decisions and personally implement the solution, I would be happy to discuss your project.
Steps for completing your project
After purchasing the project, send requirements so Costin can start the project.
Delivery time starts when Costin receives requirements from you.
Costin works on your project following the steps below.
Revisions may occur after the delivery date.
SPF auditing
SPF is a DNS-based authentication protocol that allows a domain owner to specify which mail servers are authorized to send email on its behalf.
DKIM auditing
DKIM is a method for digitally signing email messages at the server level before they are sent.